MCQ
In some viruses, $RNA$ is present instead of $DNA$ indicating that
- Atheir nucleic acid must combine with host $DNA$ before replication.
- Bthey cannot replicate.
- Cthere is no hereditary information.
- ✓$RNA$ can act to transfer heredity.
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$(1)$ medical termination of pregnancy $(MTP)$ during first trimester is generally safe
$(2)$ generally chances of conception are nil until mother breast feeds the infant upto two years
$(3)$ intrauterine devices like copper $T$ are effective contraceptives
$(4)$ contraception pills may be taken upto one week after coitus to prevent conception.
Which two of the above statements are correct?