Which cells of "Crypts of Lieberkühn" secrete antibacterial lysozyme?
1. Paneth cells
2. Zymogen cells
3. Kupffer cells
4. Argentaffin cells
Which of the following are not polymeric?
1. | Proteins | 2. | Polysaccharides |
3. | Lipids | 4. | Nucleic acids |
Functional megaspore in an angiosperm develops into:
1. | Endosperm | 2. | Embryo sac |
3. | Embryo | 4. | Ovule |
Myelin sheath is produced by:
1. Astrocytes and Schwann cells
2. Oligodendrocytes and Osteoclasts
3. Osteoclasts and Astrocytes
4. Schwann cells and Oligodendrocytes
Attractants and rewards are required for:
1. Entomophily
2. Hydrophily
3. Cleistogamy
4. Anemophily
Receptor sites for neurotransmitters are present on:
1. Pre-synaptic membrane
2. Tips of axons
3. Post-synaptic membrane
4. Membrane of synaptic vesicles
Coconut fruit is a:
1. Berry
2. Nut
3. Capsule
4. Drupe
Adult human RBCs are enucleated. Which of the following statement(s) is/ are the most appropriate explanation for this feature?
a. | They do not need to reproduce |
b. | They are somatic cells |
c. | They do not metabolize |
d. | All their internal space is available for oxygen transport |
1. Only (a)
2. (a),(c) and (d)
3. (b) and (c)
4. Only (d)
Capacitation occurs in:
1. Epididymis
2. Vas deference
3. Female reproductive tract
4. Rete testis
Asymptote in a logistic growth curve is obtained when:
1. K = N
2. K > N
3. K < N
4. The value of 'r' approaches zero