MCQ
Who gave this theory that all cells are formed from pre-existing cells:
- ✓Rudolf Virchow
- BMohl
- CHaeckel
- DRobert Brown
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| List $- I$ | List $- II$ |
| $(a)$ $S$ phase | $(i)$ Proteins are synthesized |
| $(b)$ $G_2$ phase | $(ii)$ Inactive phase |
| $(c)$ Quiescent stage | $(iii)$ Interval between mitosis and initiation of $DNA$ replication |
| $(d)$ $\mathrm{G}_{1}$ phase | $(iv)$ $DNA$ replication |
Choose the correct answer from the options given below.
$(a) -(b) -(c)- (d)$
$\begin{array}{|p{0.3\linewidth}|p{0.5\linewidth}|} \hline Column-I & Column-II\,\,(Amount\,\,of\,\,CO_2\,\,mm\,Hg) \\ \hline (a)\,\,Alveoli & (1)\,\,40 \\ \hline (b)\,\,Tissue & (2)\,\,45 \\ \hline (c)\,\,Blood\,\,without\,\,O_2 & (3)\,\,40 \\ \hline (d)\,\,Blood\,\,with\,\,O_2 & (4)\,\,45 \\ \hline \end{array}$
$a -$ cell cycle can vary from organisation to organism and also from cell type to cell type.
$b -$ $DNA$ synthesis occurs only in pachytene.
$c-G_1$ phase corresponds to the interval between mitosis and initiation of $DNA $ reproduction.
| Column I | | Column II | |
| A | Touch | i. | Nasal epithelium |
| B | Smell | ii. | Foramen magnum |
| C | Cranial nerves | iii. | Sensory papillae |
| D | Medulla oblongata | iv. | Peripheral nevous system |