Samacheer Kalvi 12th Bio Zoology Molecular Genetics Questions - 1

Question: 1

The first codon to be deciphered was which codes for

(A) TTT, arginine

(B) UUU, Phenylalanine

(C) GGG, alanine

(D) AAA, proline

Question: 2

Anoperonisa

(A) Gene that switched other genes on or off

(B) Protein that accelerates gene expression

(C) Protein that suppresses gene expression

(D) Cluster of structural genes with related function

Question: 3

Watson and Crick proposed their double helical DNA model based on the X-ray diffraction analysis of

(A) Wilkins and Franklin

(B) Griffith

(C) Erwin Chargaff

(D) Meselson and Stahl

Question: 4

Semi-conservative model of replication was proved by

(A) Griffith

(B) Hershey and Chase

(C) Macleod and McCarty

(D) Meselson and Stahl

Question: 5

Capping of mRNA occurs using

(A) Ribonucleotide triphosphate

(B) Deoxy ribonucleotide triphosphate

(C) Methyl guanosine triphosphate

(D) Poly A residues

Question: 6

Meselson and Stah’s experiment proved

(A) Semi-conservative nature of DNA replication

(B) DNA is the genetic material

(C) Transformation

(D) Transduction

Question: 7

Hershey and Chase experiment with bacteriophage showed that

(A) DNA is the genetic material

(B) Viruses undergo transformation

(C) Protein gets into the bacterial cells

(D) DNA contains radioactive sulphur