Assertion (A): DNA replication is semiconservative. Reason (R): Each new DNA molecule consists of one old and one new strand. MCQ with Answer and Explanation
Assertion (A): DNA replication is semiconservative.
Reason (R): Each new DNA molecule consists of one old and one new strand.
A. Both A and R are true, and R is the correct explanation.
B. A false, R true.
C. Both A and R are true, but R is not the correct explanation.
D. A true, R false.
Answer: Option A
Solution (By JKSSB Mock Tests)
Meselson and Stahl proved that after replication, each daughter DNA contains one parental and one newly synthesized strand. R exactly explains semiconservative.
Explanation:
Tryptophan is encoded by a single codon, UGG. Methionine (AUG) is also encoded by a single codon. The other amino acids have multiple codons (degeneracy). For example, leucine has 6 codons. The single codons for Trp and Met are significant as they are less likely to tolerate mutations.
Explanation:
Histoplasmosis is a respiratory fungal infection caused by inhaling spores of Histoplasma capsulatum, often found in bird or bat droppings. It can be severe in immunocompromised.
Explanation:
Zika virus is primarily transmitted by Aedes aegypti and Aedes albopictus mosquitoes. It can cause microcephaly in fetuses. Anopheles transmits malaria, Culex filariasis/West Nile.
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