- ✓Collagen
- BDermin
- CMatrigen
- DNone of these
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Column $A$ Column $B$
(i) Oncogenes (1)Causes $AIDS$
(ii) Single circular $DNA$ (2)Lac-Operon concept
(iii) Splicing (3) Component of bacterial chromosome
(iv) Jacob and Monad (4) Processing of $mRNA$ molecules
(5) When activated cause cancer
$(i) (ii) (iii) (iv)$ respectively

| Animals | Morphological features | |
| $(i)$ | Crocodile | $4$-chambered heart |
| $(ii)$ | Sea urchin | Parapodia |
| $(iii)$ | Obelia | Metagenesis |
| $(iv)$ | Lemur | Thecodont |
$(a)$ Stimulates the process of bone resorption
$(b)$ Decreases $Ca ^{2+}$ level in blood
$(c)$ Reabsorption of $Ca ^{2}+$ by renal tubules
$(d)$ Decreases the absorption of $Ca ^{2+}$ from digested food
$(e)$ Increases metabolism of carbohydrates
Choose the most appropriate answer from the options given below: