Which of the following nucleic acids is present in an organism having 70 S ribosomes only?

1. Single-stranded DNA with a protein coat

2. Double-stranded circular naked DNA

3. Double-stranded DNA enclosed in nuclear membrane

4. Double-stranded circular DNA with histone proteins

Subtopic:  Details of Prokaryotic Cell Structure |
 69%
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After meiosis I, the resultant daughter cells have

1. same amount of DNA as in the parent cell in S
2. twice the amount of DNA in comparison to haploid
3. same amount of DNA in comparison to haploid gamete
4. four times the amount of DNA in comparison to haploid gamete

Subtopic:  Cell Cycle: Meiosis I |
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Which of the following organic compounds is the main constituent of Lecithin?

1. Arachidonic acid

2. Phospholipid

3. Cholesterol

4. Phosphoprotein

Subtopic:  Lipids | Introduction | Lipids: Glycerolipids, Phospholipids & Glycerol |
 84%
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The main difference between active and passive transport across cell membrane is :

1. passive transport is non-selective whereas active transport is selective
2. passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.
3. passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel.
4. active transport occurs more rapidly than passive

Subtopic:  Diffusion | Membrane Transport |
 77%
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Match the items given in Column - I with those in Column - II and choose the correct option:

Column-I

Column-II
(a) Rennin (i) Vitamin B12
(b) Enterokinase (ii) Facilitated transport
(c) Oxyntic cells (iii) Milk proteins
(d) Fructose (iv) Trypsinogen

Options: (a) (b) (c) (d)
1. iii iv ii i
2. iv iii i ii
3. iv iii ii i
4. iii iv i ii

Subtopic:  Gastric Secretions | Intestinal Secretions |  DIGESTION OF FOOD |
 88%
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Kwashiorkor disease is due to:

1. simultaneous deficiency of proteins and fats
2. simultaneous deficiency of proteins and calories
3. deficiency of carbohydrates
4. protein deficiency not accompanied by calorie deficiency

Subtopic:  Protein Energy Malnutrition |
 75%
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Select the correct sequence of events.
 

1. Gametogenesis  → Gamete transfer  → Syngamy  → Zygote  → Cell division (Cleavage)  → Cell differentiation  → Organogenesis
2. Gametogenesis  → Gamete transfer → Syngamy  → Zygote  → Cell division (Cleavage) → Organogenesis  → Cell differentiation
3. Gametogenesis  → Syngamy  → Gamete transfer  → Zygote  → Cell division (Cleavage)  → Cell differentiation  → Organogenesis
4. Gametogenesis  → Gamete transfer  → Syngamy  → Zygote  → Cell differentiation  → Cell division (Cleavage)  → Organogenesis
Subtopic:  Events during Sexual reproduction |
 81%
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Among the following, which hydrolysis reaction occurs at the slowest rate?

1. 
2. 
3. 
4. 
Subtopic:  Mechanism of Reactions |
 65%
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Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex?

1. Estrogen 2. Prolactin
3. Oxytocin 4. Relaxin
Subtopic:  Prolactin & Posterior Pituitary |
 88%
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The vapor of secondary alcohol passed over heated copper at 573 K yield:
 

1. A carboxylic acid 2. An aldehyde
3. A ketone 4. An alkene
Subtopic:  Alcohols: Preparation & Properties |
 79%
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