Molecular Genetics Book Back Practice Test

12th Standard Zoology — Molecular Genetics: Book Back Online Practice Test

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Hershey and Chase experiment with bacteriophage showed that

A.Protein gets into the bacterial cells B.DNA is the genetic material C.DNA contains radioactive sulphur D.Viruses undergo transformation

DNA and RNA are similar with respect to having

A.Thymine as a nitrogen base B.A single-stranded helix shape C.Nucleotides containing sugars, nitrogen bases and phosphates D.The same sequence of nucleotides for the amino acid phenylalanine

An mRNA molecule is produced by

A.Replication B.Transcription C.Duplication D.Translation

The total number of nitrogenous bases in human genome is estimated to be about

A.3.5 million B.35000 C.35 million D.3.1 billion

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two generations. What density distribution of DNA would you expect in this experiment?

A.One high and one low density band B.One intermediate density band C.One high and one intermediate density band D.One low and one intermediate density band

What is the basis for the difference in the synthesis of the leading and lagging strands of DNA molecules?

A.Origin of replication occurs only at the 5' end of the molecules B.DNA ligase works only in the 3' to 5' direction C.DNA polymerase can join new nucleotides only to the 3' end of the growing strand D.Helicases and single-strand binding proteins work only at the 5' end

Which of the following is the correct sequence of events with reference to the central dogma?

A.Transcription, Translation, Replication B.Transcription, Replication, Translation C.Duplication, Translation, Transcription D.Replication, Transcription, Translation

Which of the following statements about DNA replication is not correct?

A.Unwinding of DNA molecule occurs as hydrogen bonds break B.Replication occurs as each base is paired with another exactly like it C.Process is known as semi-conservative replication because one old strand is conserved in the new molecule D.Complementary base pairs are held together with hydrogen bonds

Which of the following statements is not true about DNA replication in eukaryotes?

A.Replication begins at a single origin of replication B.Replication is bidirectional from the origins C.Replication occurs at about 1 million base pairs per minute D.There are numerous different bacterial chromosomes, with replication occurring in each at the same time

Q10

The first codon to be deciphered was __________ which codes for ________.

A.AAA, proline B.GGG, alanine C.UUU, Phenylalanine D.TTT, arginine

Q11

Meselson and Stahl's experiment proved

A.Transduction B.Transformation C.DNA is the genetic material D.Semi-conservative nature of DNA replication

Q12

Ribosomes are composed of two subunits; the smaller subunit of a ribosome has a binding site for _________ and the larger subunit has two binding sites for two __________.

A.mRNA, tRNA B.tRNA, mRNA C.tRNA, rRNA D.rRNA, tRNA

Q13

An operon is a

A.Protein that suppresses gene expression B.Protein that accelerates gene expression C.Cluster of structural genes with related function D.Gene that switches other genes on or off

Q14

When lactose is present in the culture medium

A.Transcription of lac y, lac z, lac a genes occurs B.Repressor is unable to bind to the operator C.Repressor is able to bind to the operator D.Both (a) and (b) are correct

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About this Molecular Genetics test

This free online practice test covers Molecular Genetics from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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