Molecular Biology MCQs with Answers

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Welcome to the Molecular Biology MCQs with Answers. In this post, we have shared Molecular Biology Online Test for different competitive exams. Find practice Molecular Biology Practice Questions with answers in Biology Tests exams here. Each question offers a chance to enhance your knowledge regarding Molecular Biology.

Molecular Biology Online Quiz

By presenting 3 options to choose from, Molecular Biology Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of Molecular Biology Questions and Answers and click over the correct answer.

Test Name: Molecular Biology MCQ Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

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Molecular Biology

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1 / 40

What is the function of the 5' cap and poly-A tail in eukaryotic mRNA?

Enhance stability and translation

Promote transcription

Remove introns

2 / 40

What is the role of spliceosomes in eukaryotic gene expression?

Remove introns from pre-mRNA

Replicate DNA

Transcribe mRNA

3 / 40

Which molecule serves as a template for the synthesis of complementary RNA during transcription?

DNA

RNA

Protein

4 / 40

What is the function of transfer RNA (tRNA) molecules in translation?

Regulate gene expression

Deliver amino acids to the ribosome

Synthesize proteins

5 / 40

What is the genetic code's redundancy referred to as?

Redundancy

Polymorphism

Degeneracy

6 / 40

What is the function of the lac operon in bacterial gene regulation?

DNA replication

RNA processing

Metabolism of lactose

7 / 40

What is the function of a restriction endonuclease in recombinant DNA technology?

Amplifies DNA fragments

Cuts DNA at specific sequences

Joins DNA fragments

8 / 40

What is the role of the Shine-Dalgarno sequence in bacterial gene expression?

Ribosome binding site

Transcription initiation site

RNA processing

9 / 40

Which enzyme is responsible for adding nucleotides to the growing RNA chain during transcription?

Helicase

RNA polymerase

DNA ligase

10 / 40

What is the function of DNA ligase in recombinant DNA technology?

Cuts DNA at specific sites

Amplifies DNA fragments

Joins DNA fragments

11 / 40

What is the role of sigma factor in bacterial transcription?

Splices pre-mRNA

Transcribes mRNA

Initiates RNA polymerase binding

12 / 40

What is the primary function of histones in eukaryotic chromosomes?

Synthesizing RNA

Splicing mRNA

Packaging DNA into nucleosomes

13 / 40

What is the function of chaperone proteins in molecular biology?

Degrade proteins

Assist protein folding

Transcribe RNA

14 / 40

Which molecule is responsible for carrying out the process of splicing during mRNA maturation?

Restriction enzyme

Ribozyme

Spliceosome

15 / 40

What is the function of the TATA box in eukaryotic gene transcription?

Removes introns

Initiates translation

Binding site for RNA polymerase

16 / 40

What is the function of the Shine-Dalgarno sequence in bacterial mRNA?

Transcription initiation site

Ribosome binding site

RNA processing

17 / 40

What is the primary function of DNA ligase in DNA replication?

Joins Okazaki fragments

Synthesizes new DNA strands

Unwinds DNA strands

18 / 40

Which structure is formed when two strands of DNA are antiparallel and complementary?

Triple helix

Double helix

Single strand

19 / 40

What is the primary function of the CRISPR-Cas9 system in genome editing?

Protein synthesis

Targeted gene editing

DNA replication

20 / 40

What type of bond holds complementary DNA base pairs together?

Covalent bonds

Hydrogen bonds

Ionic bonds

21 / 40

Which enzyme catalyzes the formation of phosphodiester bonds during DNA replication?

RNA polymerase

DNA polymerase

DNA ligase

22 / 40

What is the role of the promoter region in gene transcription?

Initiates transcription

Terminates transcription

Splices mRNA

23 / 40

Which enzyme is responsible for synthesizing the RNA primer during DNA replication?

Primase

Helicase

Ligase

24 / 40

Which process involves the copying of DNA into RNA?

Transcription

Replication

Translation

25 / 40

What is the role of sigma factor in bacterial transcription?

Initiates RNA polymerase binding

Splices pre-mRNA

Transcribes mRNA

26 / 40

What is the function of RNA polymerase in transcription?

Translates mRNA

Replicates DNA

Synthesizes RNA from DNA template

27 / 40

Which enzyme is responsible for unwinding DNA during replication?

Ligase

Polymerase

Helicase

28 / 40

What is the function of topoisomerase in DNA replication?

Adds nucleotides

Relieves torsional strain

Proofreads DNA

29 / 40

Which enzyme is responsible for unwinding the DNA double helix during DNA replication?

Ligase

Primase

Helicase

30 / 40

Which enzyme catalyzes the formation of phosphodiester bonds during DNA replication?

DNA ligase

DNA polymerase I

DNA polymerase III

31 / 40

What is the function of telomerase in eukaryotic cells?

Repair DNA damage

Maintain telomere length

Synthesize RNA

32 / 40

What is the process by which mRNA is decoded to produce a protein?

Replication

Translation

Transcription

33 / 40

What is the function of DNA polymerase in DNA replication?

Synthesizes new DNA strand

Transcribes RNA

Translates mRNA

34 / 40

What is the role of RNA interference (RNAi) in gene regulation?

Gene silencing

Protein synthesis

DNA replication

35 / 40

What is the function of ribosomal RNA (rRNA) in protein synthesis?

Encodes genetic information

Carries amino acids

Forms part of ribosome structure

36 / 40

Which RNA molecule carries amino acids to the ribosome during translation?

tRNA

mRNA

rRNA

37 / 40

What is the central dogma of molecular biology?

RNA -> DNA -> protein

DNA -> RNA -> protein

Protein -> RNA -> DNA

38 / 40

Which enzyme is responsible for cutting DNA at specific sequences during recombinant DNA technology?

Restriction endonuclease

Polymerase chain reaction (PCR)

DNA ligase

39 / 40

What is the function of reverse transcriptase in retroviruses?

Converts RNA to DNA

Transcribes mRNA

Converts DNA to RNA

40 / 40

Which technique is used to amplify a specific segment of DNA?

Southern blotting

Gel electrophoresis

Polymerase chain reaction (PCR)

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admin3 weeks ago

0 3 1 minute read