Identify the group that is not matched correctly to all the characters shown
Difficulty Level:
Math Column I with Column II and choose your answer from the codes given:
|
Column I (Bacterium) |
|
Column II (shape) |
I. |
Escherechia coli |
1. |
Spherical |
II. |
Streptococcus pyogenes |
2. |
Helically coiled |
III. |
Treponema pallidum |
3. |
Rod shaped |
|
I |
II |
III |
(1) |
1 |
2 |
3 |
(2) |
3 |
1 |
2 |
(3) |
3 |
2 |
1 |
(4) |
1 |
3 |
2 |
Difficulty Level:
Identify the incorrect statement regarding bacteria:
(1) Bacteria are the most abundant micro-organisms.
(2) Bacteria live in extreme habitats where very few other life forms can survive.
(3) Bacteria as a group show the most extensive metabolic diversity.
(4) They are obligate intracellular parasites.
Difficulty Level:
Consider the following statements regarding characters of Archaebacteria that they share with eukaryotes:
I. The cell wall does not contain peptidoglycan.
II. DNA associated with histones.
III. Translation initiated with formylated methionine.
IV. RNA polymerase similar to eukaryotic RNA polymerase II
V. ATPase similarity
VI. Similar DNA replication and repair
How many of the above characters Archaebacteria share with eukaryotes?
(1) 3
(2) 4
(3) 5
(4) 6
Difficulty Level:
Identify a character that is not unique to archaebacteria:
(1) Cell wall structure
(2) Cell membrane structure
(3) Flagellin protein structure
(4) Fatty acid synthetase present
Difficulty Level:
Identify the incorrect statement regarding true bacteria?
(1) As a group, they exhibit maximum metabolic diversity
(2) Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.
(3) Heterotrophic bacteria are the most abundant in nature.
(4) Bacteria reproduce mainly by fission but sometimes under favourable conditions, they produce spores.
Difficulty Level:
Consider the following statements regarding Mycoplasma:
I. They are a genus of bacteria that have a unique cell wall of their own.
II. In their genetic code UGA codes for tryptophan.
III. None of them is pathogenic to humans.
IV. They have a large genome.
V. They can be killed by penicillins.
VI. They can survive without oxygen
The number of correct statements is:
(1) 1
(2) 2
(3) 3
(4) 4
Difficulty Level:
Diatoms have left behind large amount of cell wall deposits in their habitat because:
(1) They are most abundant in that habitat
(2) Their life span is long
(3) Their wall is indestructible
(4) The statement is not true.
Difficulty Level:
Dinoflagellates:
I. Are mostly marine and photosynthetic.
II. Have a cell wall that has stiff cellulose plates on the outer surface.
III. Have two flagella
IV. Have chloroplasts bound by three membranes
The correct statements are:
(1) I, II and III
(2) I, III and IV
(3) II, III and IV
(4) I, II III and IV
Difficulty Level:
Consider the following characters:
I. Heterotroph organisms
II. A dikaryon stage
III. Cell wall made of chitin
IV. Undergo nuclear mitosis
Which of the above relate to fungi?
(1) I, II and III
(2) I, III and IV
(3) II, III and IV
(4) I, II, III and IV
Difficulty Level: