MCQ
Choose correct pair.
- APurine nitrogen base - cytosine
- BPyrimidine nitrogen base - adenine
- ✓Purine nitrogen base - guanine
- DAll correct
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$R -$ A typical angiosperm embryo sac, at maturity,though $8$-nucleate is $7$-celled
| (a) Tight junctions | (i) Cement neighbouring cells together to form sheet |
| (b) Adhering junctions | (ii) Transmit information through chemical to another cells |
| (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 |