Keeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
1. Both lipids and proteins can flip-flop
2. While lipids can rarely flip-flop, proteins cannot
3. While proteins can flip-flop, lipids cannot
4. Neither lipids nor proteins can flip-flop
Subtopic: Evidence for Fluidic Nature of Membrane |
62%
AIPMT - 2008
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Which one of the following pairs of plant structures has a haploid number of chromosomes?
1. Megaspore mother cell and antipodal cells
2. Egg cell and antipodal cells
3. Nucellus and antipodal cells
4. Egg nucleus and secondary nucleus
1. Megaspore mother cell and antipodal cells
2. Egg cell and antipodal cells
3. Nucellus and antipodal cells
4. Egg nucleus and secondary nucleus
Subtopic: Pistil: Female Gametophyte |
73%
AIPMT - 2008
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The C4-plants are photosynthetically more efficient than C3-plants because:
| 1. | the CO2 compensation point is more |
| 2. | CO2 generated during photorespiration is trapped and recycled through PEP carboxylase |
| 3. | The CO2 efflux is not prevented |
| 4. | They have more chloroplasts |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
55%
AIPMT - 2008
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In human adult females, oxytocin:
1. is secreted by anterior pituitary
2. stimulates growth of mammary glands
3. stimulates pituitary to secrete vasopressin
4. causes strong uterine contractions during parturition
1. is secreted by anterior pituitary
2. stimulates growth of mammary glands
3. stimulates pituitary to secrete vasopressin
4. causes strong uterine contractions during parturition
Subtopic: Gonadotropin & Gonadal Hormones |
83%
From NCERT
AIPMT - 2008
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Gel electrophoresis is used for:
| 1. | cutting of DNA into fragments |
| 2. | separation of DNA fragments according to their size |
| 3. | construction of recombinant DNA by joining with cloning vectors |
| 4. | isolation of DNA molecule |
Subtopic: Process of Biotech | Separation and Isolation of DNA fragments |
91%
From NCERT
AIPMT - 2008
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Polysome is formed by:
| 1. | several ribosomes attached to a single mRNA |
| 2. | many ribosomes attached to a strand of endoplasmic reticulum |
| 3. | a ribosome with several subunits |
| 4. | ribosomes attached in a linear arrangement |
Subtopic: Ribosome and Inclusion Bodies |
90%
From NCERT
AIPMT - 2008
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Given below are four methods (A-D) and their modes of action (1--4) in achieving contraception. Select their correct matching from the four options that follow:
|
Method |
Mode of action |
||
|
A. |
The pill |
1. |
Prevents sperms from reaching cervix |
|
B. |
Condom |
2. |
Prevents implantation |
|
C. |
Vasectomy |
3. |
Prevents ovulation |
|
D. |
Copper-T |
4. |
Semen contains no sperms |
1. A-3 B-1 C-4 D-2
2. A-4 B-1 C-2 D-3
3. A-3 B-4 C-1 D-2
4. A-2 B-3 C-1 D-4
Subtopic: Contraception: Natural Methods | Contraception: Barrier Methods & IUDs | Hormonal Contraceptives, Emergency Contraception & Terminal Methods |
90%
From NCERT
AIPMT - 2008
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What is the vital capacity of our lungs?
| 1. | Inspiratory reserve volume plus tidal volume |
| 2. | Total lung capacity minus expiratory reserve volume |
| 3. | Inspiratory reserve volume plus expiratory reserve volume |
| 4. | Total lung capacity minus residual volume |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities |
75%
From NCERT
AIPMT - 2008
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In which one of the following, the male and female gametophytes don't have free-living independent existence?
| 1. | Pteris | 2. | Funaria |
| 3. | Polytrichum | 4. | Cedrus |
Subtopic: Pteridophytes |
65%
AIPMT - 2008
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A transgenic food crop, which may help in solving the problem of night blindness in developing countries is:
| 1. | Flavr savr tomatoes |
| 2. | Starlink maize |
| 3. | Bt soybean |
| 4. | Golden rice |
Subtopic: Intro to Agri Applications | Other GM Crops |
91%
From NCERT
AIPMT - 2008
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