ALTIUS - Unit Test # 3 (OLD NCERT)

Botany - Section A

1.

Assertion: Iron deficiency in plants can cause chlorosis.
Reason: Iron is a component of chlorophyll.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

2.

In the symbiotic relationship, rhizobia supply ammonia to the plant and in return receive:
1. Simple sugars
2. Fatty acids
3. Organic acids like malate and succinate
4. Amino acids

3.

Assertion: Nitrogen fixing bacteria require a rich supply of carbohydrates.
Reason: The process of nitrogen fixation requires 16 ATP molecules for every 2 ammonia molecules synthesized.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

4.

Study the given diagram and choose the correct statement from the options given below:

1. The beet core in beaker A is at equilibrium with the surrounding water.
2. The beet core in beaker B will lose water to the surrounding environment.
3. The beet core in beaker B would be more turgid than the beet core in beaker A.
4. The beet core in beaker A is likely to gain so much water that its cells will rupture.

5. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	A sigmoid curve is a characteristic of living organisms growing in a natural environment.
Reason (R):	It is exemplified by a root elongating at a constant rate.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

6.

The practical uses of auxins include:

I:	Use of IBA in vegetative propagation of plants by cutting
II:	As a herbicide for eliminating eudicot broad-leaf weeds
III:	Making greenhouse cultivated tomatoes more viable commercially

1.	I and II only	2.	I and III only
3.	II and III only	4.	I, II and III

7.

In the given reaction:
$C_{6} H_{12} O_{6} \to 6 {CO}_{2} + 6 H_{2} O + Energy$
1. $C_{6} H_{12} O_{6}$ is oxidized and $O_{2}$ is reduced.
2. $C_{6} H_{12} O_{6}$ is reduced and $O_{2}$ is oxidized.
3. ${CO}_{2}$ is reduced and $O_{2}$ is oxidized.
4. $C_{6} H_{12} O_{6}$ is reduced and ${CO}_{2}$ is oxidized.

8.

The number of substrate-level phosphorylations in one turn of a citric acid cycle is

1.	One	2.	Two
3.	Three	4.	Four

9.

Carbon dioxide tagged with heavy isotope of oxygen was fed to a green algae in the presence of sunlight. Which of the following compounds would not be tagged with this isotope?
1. Phosphoglycerate
2. Phosphoglyceraldehyde
3. Glucose
4. Oxygen

10.

Which one of the following mammalian cells are not capable of metabolising glucose to carbon dioxide aerobically?

1.	White blood cells	2.	Unstriated muscle cells
3.	Liver cells	4.	Red blood cells

11.

When pyruvic acid is converted to acetyl CoA, the former is:

1.	Oxidized	2.	Reduced
3.	Isomerized	4.	Caboxylated

12.

A nitrogen fixing microbe associated with Azolla in rice fields is
1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix

13.

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options.

1.	Both process can happen together because the diffusion coefficients of water and CO₂ are different.
2.	The above processes happen only during night time
3.	One process occurs during the day time and the other occurs at night
4.	Both processes cannot happen simultaneously

14. Consider the characteristics of various means of transport in plants:
I. Requires special membrane proteins
II. Highly selective
III. Downhill transport
IV. Does not require ATP energy
1. While I and II are true for both facilitated diffusion and active transport, III and IV are true for both facilitated diffusion and simple diffusion.
2. While I and II are true for both facilitated diffusion and simple diffusion, III and IV are true for both facilitated diffusion and active transport.
3. Only III will be true for simple diffusion.
4. I, II, III and IV are all true for active transport.

15.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	The reaction center of PS I is known as P700 and the reaction center of PS II is known as P680.
Reason (R):	PS I functions first in the light reactions.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

16.

In section 11.1.2, NCERT states that a concentration gradient needs to be present in spite of the fact that facilitated diffusion is facilitated by a carrier. Why is it so?
1. These protein carriers have ATPase activity.
2. These protein carriers can not move in the membrane.
3. These protein carriers can not establish concentration gradients.
4. These protein carriers can provide only symport with the use of external energy.

17.

Identify the incorrect statement regarding gibberellins:

1.	All are acidic
2.	Cause bolting in plants with rosette habit
3.	Delay the maturity period of juvenile conifers
4.	Speed up malting process in brewing industry

18.

In chloroplasts the ${CF}_{1}$ part of the ATP synthase is located:

1.	on the side facing the thylakoid space.
2.	on the ATP molecules themselves.
3.	on the pigment molecules of PS I and PS II.
4.	on the stroma side of the membrane.

19.

Unlike water, all minerals cannot be passively absorbed by the roots. This is due to:
I. Minerals are present in the soil as charged particles
II. Concentration of minerals in soil is generally less than the concentration of minerals in roots
The correct statements are:
1. Only I
2. Only II
3. Both 1 & II are incorrect
4. Both 1 & II are correct

20.

The metabolic pathway common to aerobic respiration, anaerobic respiration and fermentation is:
1. chemiosmosis
2. the oxidation of pyruvate to acetyl CoA
3. the citric acid cycle
4. glycolysis

21.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	Carbon fixation by RuBisCO can be enhanced by increasing the carbon dioxide level in the compartment containing RuBisCO.
Reason (R):	Carbon dioxide and oxygen compete at the active site of RuBisCO.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

22.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	When the roots begin to sense a water shortage in the soil, abscisic acid (ABA) is released.
Reason (R):	ABA plays a primary role in closing stomata in response to drought.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

23.

Which of the following bacteria reduces nitrate in soil into nitrogen?
1. Nitrobacter
2. Thiobacillus
3. Nitrococcus
4. Nitrosomonas

24.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	Mutants that overproduce cytokinins or plants treated with cytokinins tend to be bushier than normal.
Reason (R):	Cytokinins help overcome the apical dominance.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

25.

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

1.	Gibberellin	2.	Ethylene
3.	Abscisic acid	4.	Cytokinin

26.

The formation and stability of plant cell walls mainly requires:

1.	iron	2.	magnesium
3.	calcium	4.	molybdenum

27.

To generate a proton gradient, in mitochondria, the protons are pumped:

1.	into the cytosol from the mitochondria
2.	from the mitochondrial matrix into the intermembrane space of the mitochondria
3.	from the cytosol into the matrix of the mitochondria
4.	out of the nucleus and into the mitochondria

28.

Which of the following does not enter the plant through roots?
1. carbon dioxide
2. nitrogen
3. potassium
4. water

29.

The correct chronological sequence of protein complexes in the thylakoid membrane involved in light reactions is:

1.	Photosystem II (PS II), Cytochrome b6f complex, Photosystem I (PS I), and ATP synthase.
2.	Photosystem I (PS I), Cytochrome b6f complex, Photosystem II (PS II), and ATP synthase.
3.	Photosystem II (PS II), Photosystem I (PS I), Cytochrome b6f complex, and ATP synthase.
4.	Photosystem I (PS I), Photosystem II (PS II), Cytochrome b6f complex, and ATP synthase.

30.

The correct sequence of cell organelles during photorespiration is
1. chloroplast-golgi bodies-mitochondria
2. chloroplast-rough endoplasmic reticulum-dictyosomes
3. chloroplast-peroxisome-mitochondria
4. chloroplast-vacuole-peroxisome

31.

Coconut milk factor is : -

1.	An auxin	2.	A gibberellin
3.	Abscisic acid	4.	Cytokinin

32.

Who coined the term 'Kinetin'?

1.	Skoog and Miller	2.	Darwin
3.	Went	4.	Kurosawa

33.

Which pigment acts directly to convert light energy to chemical energy ?

1.	Chlorophyll a	2.	Chlorophyll b
3.	Xanthophylls	4.	Carotenoid

34. In the enzyme which catalyses the breakdown of:
$\mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
the prosthetic group is :
1. Nicotinamide adenine dinucleotide
2. Haem
3. Zinc
4. Niacin

35.

Which of the following was proved by girdling experiment?

1.	Apoplastic movement of water occurs through intercellular spaces
2.	Symplastic movement of water occurs through interconnected protoplast
3.	Xylem is responsible for uptake of water
4.	Phloem is responsible for translocation of food

Botany - Section B

36.

If you have carefully read the role of macronutrients in your NCERT, you should be able to tell the name of the mineral that plays an important role in several carbon dioxide transfers catalyzed by carboxylase enzymes. The mineral is:
1. Magnesium
2. Sulfur
3. Iron
4. Calcium

37.

Treatment of seed at low temperature under moist conditions to break its dormancy is called
1. scarification
2. vernalization
3. chelation
4. stratification

38.

Growing plants being suspended in a closed or semi-closed environment by spraying the plant's dangling roots and lower stem with an atomized or sprayed, nutrient-rich water solution is called as:
1. Hydroponics
2. Aquaponics
3. Aeroponics
4. In vitro culture

39.

Assertion: Of all the mineral nutrients, nitrogen contributes the most to plant growth and crop yields.
Reason: Nitrogen is an essential macronutrient required by all plants.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

40.

$C_{4}$ -plants are photosynthetically more efficient than $C_{3}$ -plants because

1.	${CO}_{2}$ compensation point is more.
2.	${CO}_{2}$ generated during photorespiration is trapped and recycled through PEP carboxylase.
3.	${CO}_{2}$ efflux is not prevented.
4.	they have more chloroplasts.

41.

Unloading of mineral ions occurs at the fine vein endings through:
1. diffusion and, are passively taken up by the sink cells
2. active transport and, are passively taken up by the sink cells
3. diffusion and, are actively taken up by the sink cells
4. active transport and, are actively taken up by the sink cells

42.

The pressure component of water potential most often would be negative in:
1. leaf mesophyll cell
2. stem xylem
3. stem phloem
4. root cortex cell

43.

During seed germination, its stored food is mobilised by:

1.	ethylene	2.	cytokinin
3.	ABA	4.	gibberellin

44. Identify the correct statements:
I: Body is segmented in both Annelida and Chordata.
II: Blood vascular system is closed in both Annelida and Arthropoda.
III: Adults exhibit radial symmetry in both Annelida and Echinodermata.
IV: Triploblastic organization is seen in both Annelida and Platyhelminthes.
1. I and II only
2. II and III only
3. I and IV only
4. III and IV only

45.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A):	If oxygen is available, it is invariably used as the terminal electron acceptor in aerobic cellular respiration.
Reason (R):	It acts as the terminal electron as well as proton acceptor.

In the light of the above statements choose the correct answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

46.

All the following statements regarding root hair in plants are true except:

1.	They are lateral extensions of a single cell.
2.	They are found only in the region of maturation of the root.
3.	They are very frequently branched.
4.	They are where most water absorption happens.

47.

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is :

1.	cytochrome	2.	iron-sulphur protein
3.	ferredoxin	4.	quinone

48.

The translocation of organic solutes in sieve tube members is supported by:
1. root pressure and transpiration pull
2. P-proteins
3. mass flow involving a carrier and ATP
4. cytoplasmic streaming

49.

The number of oxygen molecules required each time a molecule of glucose is completely oxidized via aerobic respiration is:

1.	1	2.	2
3.	6	4.	12

50. Identify the correct statements regarding chemiosmotic hypothesis :

(a)	Splitting of the water molecule takes place on the inner side of the membrane.
(b)	Protons accumulate within the lumen of the thylakoids.
(c)	Primary acceptor of electron transfers the electrons to an electron carrier.
(d)	NADP reductase enzyme is located on the stroma side of the membrane.
(e)	Protons increase in number in stroma.

Choose the correct answer from the options given below:
1. (a), (b) and (e)
2. (a), (b) and (d)
3. (b), (c) and (d)
4. (b), (c) and (e)

Zoology - Section A

51.

When secreted due to a fatty meal, the hormone cholecystokinin promotes all of the following except:
1. contraction of gall bladder
2. increased production of hepatic bile
3. contraction of sphincter of Oddi
4. stimulation of pancreas

52.

The dysfunction of which of the following will most adversely affect the digestion of food in humans?
1. Gall bladder
2. Stomach
3. Pancreas
4. Salivary glands

53.

Identify the incorrect statement regarding rods and cones:
1. Rods are more sensitive to light than cones
2. There are more rods than cones in the retina
3. Cone vision provides higher acuity than rod vision
4. Rods are found primarily in the fovea while cones are more scattered throughout the retina

54.

What is the term and value for the maximum amount of air a person can expel from the lungs after a maximum inhalation?
1. vital capacity, 4600
2. total lung capacity, 5800
3. inspiratory reserve volume, 3000
4. inspiratory capacity, 3500

55.

The beta cells of the endocrine pancreas secrete insulin that:
1. is secreted by the alpha cells of the pancreas
2. promotes the entry of glucose and amino acids into tissue cells
3. promotes the breakdown of glycogen (glycogenolysis) and fat (lipolysis)
4. falls in level immediately after a meal is eaten

56.

The head of the humerus forms a ball and socket joint with a scapular:

1.	acromion process.	2.	glenoid cavity.
3.	coracoid process.	4.	acetabulum.

57.

The part of the limbic system that plays important roles in the consolidation of information from short-term memory to long-term memory is the:

1.	Cingulate gyrus	2.	Hippocampus
3.	Amygdala	4.	Septum

58.

The glomerular ultrafiltrate will normally not contain:

1.	hemoglobin	2.	sodium ions
3.	bicarbonate ions	4.	glucose

59.

The definition of hormone describes them as having all the following features except:
1. non-nutrient chemicals
2. intra-cellular messengers
3. produced in trace amounts
4. act on distant target organ

60.

The damage to which of the following cells of the gastric mucosa would negatively affect the formation of RBC in human body?
1. mucus neck cells
2. peptic or chief cells
3. parietal or oxyntic cells
4. enterochromaffin cells

61.

Identify the incorrect statement regarding anatomy of human kidney:

1.	Adrenal gland is located at the inferior pole of each kidney
2.	Columns of Bertini are extensions of cortex into medulla
3.	Right kidney is slightly lower in location than the left kidney
4.	The renal pelvis continues into the ureter

62.

When the heart muscle is suddenly damaged by an inadequate blood supply, the condition is called as:

1.	Heart failure	2.	Heart block
3.	Heart attack	4.	Cardiac arrest

63.

The bone that provides attachment to the tongue but does not directly articulate with another bone is:

1.	ethmoid	2.	palatine
3.	hyoid	4.	larynx

64.

The ion, critical in absorption of nutrients like amino acids and glucose in the human alimentary canal, is:
1. Na⁺
2. H⁺
3. K⁺
4. Ca⁺⁺

65.

Normal activities of the heart are regulated:
1. intrinsically
2. by adrenal medullary hormones
3. by sympathetic nervous system
4. by parasympathetic nervous system

66.

Trachea is invested with incomplete cartilaginous rings. They:

1.	serve as a point of attachment for some muscles of expiration.
2.	support muscular attachments to the thyroid cartilage and epiglottis.
3.	prevent the trachea from collapsing.
4.	attach the trachea to the esophagus posteriorly.

67.

A disease of the lungs, due to chronic inhalation of dust particles, would be characterized by:

1.	pneumonia	2.	tuberculosis
3.	pulmonary fibrosis	4.	lung cancer

68.

The enzyme carbonic anhydrase is present:

1.	in RBCs but not in plasma
2.	in high concentration in RBCs and in minute quantity in plasma
3.	in minute quantities, both in RBCs and in plasma
4.	in high concentration, both in RBCs and in plasma

69.

An increased production of dilute urine will be the result of:
1. decreased ADH secretion
2. increased renin secretion
3. increased insulin production
4. increased aldosterone secretion

70.

The type of antigen on the surface of RBC and the type of antibodies in plasma of person with genotype $I^{A} I^{O}$ would respectively be:

1. B; anti B	2. A; anti B
3. A; anti A	4. B; anti A

71.

The autonomic neural system relays impulse from the CNS to:

I:	skeletal muscles
II:	smooth muscles
III:	involuntary organs

1.	I and II only	2.	I and III only
3.	II and III only	4.	I, II and III

72.

The fluid in the nephron will have maximum osmolarity at:
1. Bowman's capsule
2. proximal tubule
3. bottom of the loop of Henle
4. distal tubule

73.

All the following statements regarding hemoglobin are true except:
1. Hemoglobin loads up with oxygen in the alveolar capillaries.
2. Approximately 97% of hemoglobin in red blood cells is in the form of oxyhemoglobin.
3. Hemoglobin has a lower affinity for oxygen at higher temperatures.
4. Each molecule of hemoglobin can carry one molecule of oxygen.

74.

The basal metabolic rate is most significantly influenced by:

1.	thyroxine	2.	cortisone
3.	adrenaline	4.	melatonin

75.

The outer covering of gray matter over the hemispheres is called as the cerebral:

1.	cortex	2.	medulla
3.	gyri	4.	sulci

76.

Autoimmune inflammation of the joint is:

1.	gout	2.	osteoarthritis
3.	rheumatism	4.	rheumatoid arthritis

77.

Match each item in Column I with one in Column II and select the correct answer from the codes given:

	Column I		Column II
A.	Closure of AV valves	a.	Second heart sound
B.	Closure of semilunar valves	b.	First heart sound
C.	Opening of AV valves	c.	Ventricular ejection
D.	Opening of semilunar valves	d.	Passive ventricular filling

Codes:

	A	B	C	D
1.	a	b	c	d
2.	b	a	c	d
3.	b	a	d	c
4.	a	b	d	c

78.

How does steroid hormone influence the cellular activities?

1.	Using aquaporin channels as second messenger
2.	Changing the permeability of the cell membrane
3.	Binding the DNA and forming a gene-hormone complex
4.	Activating cyclic AMP located on the cell membrane

79.

Which of the following will bring about inhalation?

1.	Contraction of diaphragm and contraction of external intercostals
2.	Relaxation of diaphragm and relaxation of external intercostals
3.	Contraction of diaphragm and contraction of internal intercostals
4.	Relaxation of diaphragm and relaxation of internal intercostals

80.

A high rate of red blood cell destruction, with elevated levels of bilirubin in the blood, causes ______.

1. diverticulitis	2. gall stones
3. jaundice	4. lithotripsy

81.

The central cardiac control region is in the _____ of the brain.

1. hypothalamus	2. medulla oblongata
3. cerebellum	4. pons

82.

Arrange the following sphincters in gastrointestinal tract in order of their occurrence from oral cavity to anus:
a. external anal sphincter
b. ileocecal sphincter
c. lower esophageal sphincter
d. pyloric sphincter

1. a, c, b, d	2. b, c, d, a
3. b, a, c, d	4. c, d, b, a

83.

Identify a submucosal gland:

1. oxyntic glands	2. intestinal crypts
3. Brunner's glands	4. pyloric glands

84.

The wall of alimentary canal from oesophagus to rectum possesses four layers. The correct sequence of these layers from the outermost to the inner most is:
1. Serosa, Muscularis, Submucosa, Mucosa
2. Mucosa, Submucosa, Muscularis, Serosa
3. Serosa, Muscularis, Mucosa, Submucosa
4. Mucosa, Muscularis, Submucosa, Serosa

85.

Match the plasma proteins in Column I with their function in Column II and select the correct answer from the codes given:

	Column I		Column II
A.	Albumins	a.	Hemostasis
B.	Globulins	b.	Transport carriers and immunity
C.	Fibrinogen	c.	Colloid osmotic pressure

Codes:

	A	B	C
1.	a	b	c
2.	a	c	b
3.	b	a	c
4.	c	b	a

Zoology - Section B

86.

Electrical synapses differ from the chemical synapse in that they:
1. occur when two cells are joined by integrin proteins
2. are characterized by a synaptic cleft
3. occur between two cells of unequal size
4. require the presence of gap junctions

87.

In the countercurrent multiplier system of the kidneys, when producing concentrated urine:
1. The descending limb of the loop of Henle makes the filtrate less salty (hypotonic).
2. The interaction between the ascending and descending limbs is an example of negative feedback.
3. Salt builds up in the medulla, making it saltier toward the tip of the loop of Henle.
4. Water stays in the medulla because of higher osmotic pressure in the blood of the vasa recta.

88.

All the following statements regarding the action potential are true except:
1. Only a relatively small number of ${Na}^{+}$ and $K^{+}$ ions actually diffuse across the membrane.
2. This event includes both positive and negative feedback loops.
3. The ${Na}^{+}$ / $K^{+}$ pumps are directly involved in creating the action potential.
4. During an action potential, the ${Na}^{+}$ and $K^{+}$ total concentration are not significantly changed.

89.

Bile pigments help in:
1. Emulsification of fats
2. Absorption of the end products of fat digestion
3. Hydrolysis of fats
4. They do not play any role in fat metabolism or digestion

90.

Consider the following statements regarding human alimentary canal:
I. Human dentition is thecodont, homodont and diphyodont
II. The tongue is freely movable muscular organ attached to the roof of the oral cavity by the frenulum
III. The opening of the stomach into the duodenum is guarded by the cardiac sphincter
The incorrect statements include:

1. None	2. Only I
3. I and III only	4. I, II and III

91.

Which hormone is antagonistic to insulin regarding its effects on carbohydrate, fat and protein metabolism?

1.	Glucagon	2.	Growth hormone
3.	Melatonin	4.	Cortisol

92.

A normal blood pressure reading in a healthy adult human being would be:

I:	116/76 mm Hg
II:	150/80 mm Hg
III:	120/94 mm Hg

1.	Only I	2.	Both I and II
3.	Both I and III	4.	I, II and III

93.

Arrange the given structures in relation to a skeletal muscle in descending order of their size:
a. whole muscle
b. muscle fiber (cell)
c. myofilament
d. myofibril
e. muscle fasciculus

1.	a, b, e, c, d	2.	a, b, e, d, c
3.	a, e, b, c, d	4.	a, e, b, d, c

94.

Aldosterone:
1. is a steroid secreted by adrenal medulla.
2. acts on PCT leading to the reabsorption of sodium ions and water.
3. stimulates the secretion of K⁺ from the peritubular blood into the distal convoluted tubule.
4. is not regulated by serum potassium concentration.

95.

The atmospheric air pressure at sea level is 760 mm Hg and 20% of it is composed of oxygen. What would be the partial pressure of oxygen in atmospheric air?

1.	152 mm Hg	2.	40 mm Hg
3.	104 mm Hg	4.	159.6 mm Hg

96.

The functions of the respiratory rhythm center can be moderated by a center located in:

1.	Medulla oblongata	2.	Pons varoli
3.	Hypothalamus	4.	Cerebrum

97.

What separates the right and the left atria in the human heart?

1.	A thin muscular wall	2.	A thick muscular wall
3.	A thin fibrous membrane	4.	A thick fibrous membrane

98.

The cartilage present in the pubic symphysis is:

1.	Elastic	2.	Hyaline
3.	Fibrous	4.	Calcified

99.

Hydrophilic hormones:

1.	activate intracellular receptors
2.	pass through the plasma membrane
3.	bind to membrane receptors to initiate signal transduction pathways
4.	are usually fat-soluble

100.

The hormone angiotensinogen is produced by:

1.	Liver	2.	Kidney
3.	Heart	4.	Pituitary

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