MCQ
Restriction enzymes are isolated chiefly from?
- AAlgae
- BFungi
- CProtozoans
- DProkaryotes
Explanation:
The bacteria (prokaryotes) contain special types of enzymes called the restriction enzymes.
These enzymes are responsible for cleaving the viral DNA that enters the bacterial cell for the infection, thereby restricting the growth of the virus particles.
Therefore, these are nucleases.
These do not degrade the DNA of the bacterial cell because the DNA is protected by methylation.
Due to their specific cleaving activity, the restriction enzymes are widely used in rDNA technology.
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Statement $II :$ $'AAA'$ and $'AAG'$ both codons code for the amino acid lysine.
In the light of the above statements, choose the correct answer from the options given below.
| List $I$ | List $II$ |
| $A.$ Down's syndrome | $I.$ $11^{th}$ chromosome |
| $B.$ $\alpha -$Thalassemia | $II.$ $X$ chromosome |
| $C.$ $\beta -$Thalassemia | $III.$ $21^{st}$ chromosome |
| $D.$ Klinefelter's syndrome | $IV.$ $16^{th}$ chromosome |