Match the following cell structure with its characteristic feature:
| Column-I | Column-II | ||
| (a) | Tight junctions | (i) | Cement neighboring cells together to form a sheet |
| (b) | Adhering junctions | (ii) | Transmit information through chemicals to another cell |
| (c) | Gap junctions | (iii) | Establish a barrier to prevent leakage of fluid across epithelial cells |
| (d) | Synaptic junctions | (iv) | Cytoplasmic channels to facilitate communication between adjacent cells |
Select the correct option from the following:
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (iv) | (i) | (iii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (iv) | (iii) | (i) | (ii) |
"Ramachandran plot" is used to confirm the structure of:
1. RNA
2. Proteins
3. Triacylglycerides
4. DNA
Which of the following sexually transmitted diseases do not specifically affect reproductive organs?
| 1. | Genital warts and Hepatitis-B |
| 2. | Syphilis and Genital herpes |
| 3. | AIDS and Hepatitis B |
| 4. | Chlamydiosis and AIDS |
Humans have acquired an immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it:
| 1. | is very specific and uses different macrophages |
| 2. | produces memory cells for mounting a fast secondary response |
| 3. | has natural killer cells that can phagocytose and destroy microbes |
| 4. | provides passive immunity |
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
| 1. | SA node has the lowest rate of depolarisation |
| 2. | SA node is the only component to generate the threshold potential. |
| 3. | Only SA node can convey the action potential to the other |
| 4. | SA node has the highest rate of depolarisation. |
An enzyme catalysing the removal of nucleotides from ends of DNA is:
| 1. | DNA ligase | 2. | Endonuclease |
| 3. | Exonuclease | 4. | Protease |
No new follicles develop in the luteal phase of the menstrual cycle because :
| 1. | Follicles do not remain in the ovary after ovulation |
| 2. | FSH levels are high in the luteal phase |
| 3. | LH levels are high in the luteal phase |
| 4. | Both FSH and LH levels are low in the luteal phase |
Which of the following receptors are specifically responsible for maintenance of balance of body and posture?
1. Basilar membrane and otoliths
2. Hair cells and organ of corti
3. Tectorial membrane and macula
4. Crista ampullaris and macula
Which of the following statements is not correct?
| 1. | An action potential in an axon does not move backward because the segment behind is in a refractory phase. |
| 2. | Depolarization of hair cells of cochlea results in the opening of the mechanically gated Potassium- ion channels. |
| 3. | Rods are very sensitive and contribute to daylight vision. |
| 4. | In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction. |
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