MCQ
Mutations:
- ATake place gradually and in small steps
- BAre all heritable and give rise to new species
- CAre subject to natural selection
- DBoth B and C
Explanation:
Mutation is a permanent change of the nucleotide sequence of the genome of an organism, virus or extrachromosomal DNA or other genetic elements. It is subject to natural selection. It was first explained by Hugo de Vries. Germline mutation are the type of mutation that takes place in the germline cells and are heritable. Mutation lead to the evolution of new species.
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Few such steps include
$I.$ ensuring use of disposable needles and syringes
$II.$ free distribution of condoms
$III.$ advocating safe sex
$IV.$ controlling drug abuse
Which of the steps given above are correct?
| Microbe | Product | Application |
| $(a)$ Streptococccus | Streptokinase | Removal of clot fromblood vessel |
| $(b)$ Clostridium butylicum | Lipase | Removal of oil stains |
| $(c)$ Trichoderma polysporum | Cyclosporin $A$ | Immuno-suppressive drug |
| $(d)$ Monascus purpureus | Statins | Lowering of blood cholesterol |