TN State Board Samacheer Kalvi Online Test for 12th Std - Biology - English - Molecular Genetics

Question 1 Of 10

A nucleoside is composed of………………………………

Sugar and Phosphate Nitrogen base and Phosphate Sugar and Nitrogen base Sugar, Phosphate and Nitrogenous base

Question 2 Of 10

Identify the triplet pairs that code for Tyrosine

UUU,UUC UAU, UAU UGC, UGU CAU, CAC

Question 3 Of 10

In Hershey – Chase experiment, the DNA of T2 phase was made radioactive by using

32P 35S 35P 35S

Question 4 Of 10

In DNA fingerprinting, separation of DNA fragments is done by………

Centrifugation Electrophoresis X-ray diffraction denaturation

Question 5 Of 10

Pick out the incorrect statement.

tRNA acts as a adapter molecule Stop codons do not have tRNA’s Addition of amino acid leads to hydrolysis of tRNA {d) tRNA has four major loops Addition of amino acid leads to hydrolysis of tRNA

Question 6 Of 10

Semi-conservative model of replication was proved by

Hershey and Chase Griffith Meselson and Stahl Macleod and McCarty

Question 7 Of 10

Identify the incorrect statement

Replication occurs at ori – site of DNA Deoxy nucleotide triphosphate acts as a substrate Unwinding of DNA strand is carried out by topoisomerase DNA polymerase catalyses the polymerization at 3-OH

Question 8 Of 10

When lactose is present in the culture medium:

Transcription of lacy, lac z, lac a genes occurs Repressor is unable to bind to the operator Repressor is able to bind to the operator Both (a) and (b) are correct

Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 12th Standard Biology - English Medium - Molecular Genetics

Samacheer Kalvi 12th Biology - Molecular Genetics - Book Back Questions in English Medium