MCQ
"Molecular scissors" used in genetic engineering is:
- AHelicase
- BDNA ligase
- CDNA polymerase
- DRestriction endonuclease
Explanation:
Restriction endonuclease enzyme is known as the molecular scissor because a restriction enzyme recognizes and cuts the DNA only at a particular sequence of nucleotides and producing smaller fragments.
Helicases are enzymes that bind and may even remodel nucleic acid or nucleic acid-protein complexes. There are DNA and RNA helicases are involved in the unwinding of the nucleic acids.
In molecular biology, DNA ligase is a specific type of enzyme that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond.
The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA.
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| Column-I | Column-II |
| $(A)$ Government of India legalized $MTP$ in | $(1)$ $1951$ |
| $(B)$ Family planning introduced in | $(2)$ $1971$ |
| $(C)$ Lactational - Amenorrhoea | $(3)$Natural contraveptive |
| $(D)$ $IUD $ | $(4)$progesterone |
| $(E)$ Pill | $(5)$Cu$-T$ |