MCQ
Restriction endonucleases are
- ASynthesized by bacteria
- BPresent in mammalian cells for degradation of $DNA$
- ✓Used in genetic engineering
- DUsed for in vitro $DNA$ synthesis
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$a \quad\;b \quad\;c \quad\;d$

| Column $I$ | Column $II$ |
| $A$. Centrioles |
$I$. Non-membrane bound organelle Which helps in cell division |
| $B$. Fimbriae |
$II$. Special structure of bacteria which help them to attach with rocks in |
| $C$. Endomembrane |
$III$. Includes those organelles system whose functions are coordinated |
| $D$. Mitochondria |
$IV$. Divide by fission and site of aerobic respiration |
| Column - $I$ | Column - $II$ |
| $(a)$ Parasitism | $(i)$ $++$ |
| $(b)$ Commensalism | $(ii)$ $+-$ |
| $(c)$ Amensalism | $(iii)$ $0+$ |
| $(d)$ Mutualism | $(iv)$ $0-$ |
