The two subunits of ribosome remain united at a critical ion level of:

1. copper
2. manganese
3. magnesium
4. calcium
Subtopic:  Ribosome and Inclusion Bodies |
 64%
Level 2: 60%+
AIPMT - 2008
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During the propagation of a nerve impulse, the action potential results from the movement of:

1. K+ ions from extracellular fluid to intracellular fluid

2. Na+ ions from intracellular fluid to extracellular fluid

3. K+ ions from intracellular fluid to extracellular fluid

4. Na+ ions from extracellular fluid to intracellular fluid

Subtopic:  Origin of Resting Membrane Potential | Action Potential |
 68%
Level 2: 60%+
AIPMT - 2008
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Bacterial leaf blight of rice is caused by a species of:

1. Xanthomonas

2. Pseudomonas

3. Alternaria

4. Erwinia

 50%
Level 3: 35%-60%
AIPMT - 2008
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Darwin's finches are an excellent example of:
1. adaptive radiation
2. seasonal migration
3. brood parasitism
4. connecting links
Subtopic:  Darwin's Theory | Summary of Darwin's Theory |
 97%
Level 1: 80%+
AIPMT - 2008
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Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to:

1. coelomic fluid
2. blood
3. gut peristalsis
4. setae
Subtopic:  Earthworm |
 60%
Level 2: 60%+
AIPMT - 2008
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Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?

1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines

Subtopic:  The DNA | DNA Double Helix |
 86%
Level 1: 80%+
AIPMT - 2008
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Main objective of production/use of herbicide-resistant GM crops is to:
1. eliminate weeds from the field without the
use of manual layout
2. eliminate weeds from the field without the
use of herbicides
3. encourage eco-friendly herbicides
4. reduce herbicide accumulation in food
particles for health safety

Subtopic:  Intro to Agri Applications | Other GM Crops |
Level 4: Below 35%
AIPMT - 2008
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The table below gives the populations(in thousands) of ten species(A--J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question as follows: 
which area out of a to d shows maximum species diversity? 

1. b

2. c

3. a

4. d

Subtopic:  Population Dynamic |
Level 3: 35%-60%
AIPMT - 2008
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To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes, belong?

1. Cytokine barriers

2. Cellular barriers

3. Physiological barriers

4. Physical barriers

Subtopic:  Details of Immunity |
 91%
Level 1: 80%+
AIPMT - 2008
Hints

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Cornea transplant in humans is almost never rejected. This is because:

1. its cells are least penetrable by bacteria

2. it has no blood supply

3. it is composed of enucleated cells

4. it is a non-living layer

Subtopic:  Active & Passive Immunity |
 76%
Level 2: 60%+
AIPMT - 2008
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