Life Science: Cell and Molecular Biology (UGC NET SLET)
Table of Contents
Introduction
Preparing for exams like UGC NET or SLET in Life Sciences requires not just theoretical knowledge but also consistent practice with high-quality questions. To help aspirants strengthen their understanding, this free mock test on Cell and Molecular Biology brings you 50 carefully selected hard-level MCQs.
These questions are designed to match the difficulty level of competitive exams and cover important concepts such as DNA replication, transcription, translation, gene regulation, cell cycle, molecular techniques, and signaling pathways. Practicing with these questions will not only test your conceptual clarity but also improve your problem-solving speed and accuracy. At the end of the quiz, detailed answers are provided so that you can evaluate your performance and learn effectively. This mock test will be a valuable resource in your journey towards cracking the UGC NET/SLET examinations with confidence.
The questions provided here are for educational and practice purposes only. They are not taken from official UGC NET or SLET papers. While every effort has been made to ensure accuracy, aspirants are advised to cross-check important facts from standard textbooks and official resources.
UGC NET Life Sciences: Molecular Biology MCQs (100 Questions):
1. The enzyme responsible for unwinding DNA during replication in eukaryotes is:
(a) DNA polymerase
(b) Helicase
(c) Topoisomerase
(d) Ligase
Answer: (b) Helicase
2. In prokaryotes, the Shine-Dalgarno sequence is essential for:
(a) Transcription initiation
(b) Translation initiation
(c) DNA replication
(d) RNA splicing
Answer: (b) Translation initiation
3. The primary role of the Mcm2-7 complex in eukaryotic DNA replication is to:
(a) Synthesize RNA primers
(b) Act as a replicative helicase
(c) Stabilize single-stranded DNA
(d) Join Okazaki fragments
Answer: (b) Act as a replicative helicase
4. Which protein is critical for the licensing of DNA replication origins in eukaryotes?
(a) ORC (Origin Recognition Complex)
(b) RPA (Replication Protein A)
(c) PCNA (Proliferating Cell Nuclear Antigen)
(d) DnaA
Answer: (a) ORC (Origin Recognition Complex)
5. The Tus protein in E. coli is involved in:
(a) Transcription termination
(b) Replication termination
(c) Translation elongation
(d) DNA repair
Answer: (b) Replication termination
6. In eukaryotic transcription, the TATA box is recognized by which component of the transcription initiation complex?
(a) TBP (TATA-binding protein)
(b) TFIIH
(c) RNA polymerase II
(d) TFIIB
Answer: (a) TBP (TATA-binding protein)
7. The role of the poly-A tail in eukaryotic mRNA is to:
(a) Initiate transcription
(b) Enhance mRNA stability and translation
(c) Facilitate splicing
(d) Promote DNA replication
Answer: (b) Enhance mRNA stability and translation
8. Which of the following is a key difference between prokaryotic and eukaryotic transcription?
(a) Prokaryotes use multiple RNA polymerases
(b) Eukaryotes lack a promoter region
(c) Prokaryotic transcription and translation are coupled
(d) Eukaryotes use a single RNA polymerase
Answer: (c) Prokaryotic transcription and translation are coupled
9. The lac operon in E. coli is an example of:
(a) Positive inducible regulation
(b) Negative repressible regulation
(c) Negative inducible regulation
(d) Positive repressible regulation
Answer: (c) Negative inducible regulation
10. In eukaryotes, the Mediator complex primarily functions to:
(a) Unwind DNA
(b) Recruit RNA polymerase II to the promoter
(c) Synthesize RNA primers
(d) Repair DNA damage
Answer: (b) Recruit RNA polymerase II to the promoter
11. Which histone modification is most commonly associated with active transcription?
(a) Histone methylation at H3K9
(b) Histone acetylation at H3K4
(c) Histone phosphorylation at H2AX
(d) Histone ubiquitination at H2B
Answer: (b) Histone acetylation at H3K4
12. The CRISPR-Cas9 system is primarily used for:
(a) DNA sequencing
(b) Gene editing
(c) Protein purification
(d) RNA interference
Answer: (b) Gene editing
13. In DNA replication, the leading strand is synthesized:
(a) Discontinuously in short fragments
(b) Continuously in the 5’ to 3’ direction
(c) In the 3’ to 5’ direction
(d) Without a primer
Answer: (b) Continuously in the 5’ to 3’ direction
14. The enzyme responsible for synthesizing RNA primers during DNA replication is:
(a) DNA polymerase
(b) RNA polymerase
(c) Primase
(d) Ligase
Answer: (c) Primase
15. In prokaryotes, transcription termination often involves:
(a) Rho-dependent termination
(b) Polyadenylation
(c) Splicing
(d) TATA box recognition
Answer: (a) Rho-dependent termination
16. The role of the sigma factor in bacterial transcription is to:
(a) Elongate the RNA chain
(b) Bind to the promoter region
(c) Terminate transcription
(d) Stabilize the RNA polymerase
Answer: (b) Bind to the promoter region
17. Which of the following is NOT a component of the eukaryotic spliceosome?
(a) snRNAs
(b) snRNPs
(c) Sigma factor
(d) Splicing factors
Answer: (c) Sigma factor
18. The technique used to amplify specific DNA sequences in vitro is:
(a) Gel electrophoresis
(b) Polymerase Chain Reaction (PCR)
(c) Southern blotting
(d) Western blotting
Answer: (b) Polymerase Chain Reaction (PCR)
19. In eukaryotic cells, the 5’ cap on mRNA consists of:
(a) Poly-A tail
(b) 7-methylguanosine
(c) Uracil
(d) Thymine
Answer: (b) 7-methylguanosine
20. The role of the Pribnow box in prokaryotic transcription is to:
(a) Terminate transcription
(b) Serve as a promoter element
(c) Bind tRNA
(d) Facilitate splicing
Answer: (b) Serve as a promoter element
21. Which protein is essential for the sliding clamp function in eukaryotic DNA replication?
(a) RPA
(b) PCNA
(c) ORC
(d) DnaB
Answer: (b) PCNA
22. The trp operon in E. coli is regulated by:
(a) Attenuation
(b) Catabolite repression
(c) Positive feedback
(d) DNA methylation
Answer: (a) Attenuation
23. In eukaryotes, the process of alternative splicing allows:
(a) Multiple proteins from a single gene
(b) DNA replication without primers
(c) Transcription without RNA polymerase
(d) Translation in the nucleus
Answer: (a) Multiple proteins from a single gene
24. The role of the Kozak sequence in eukaryotic translation is to:
(a) Terminate translation
(b) Initiate transcription
(c) Enhance ribosome binding to mRNA
(d) Stabilize DNA
Answer: (c) Enhance ribosome binding to mRNA
25. Which DNA repair mechanism corrects errors during replication by removing mismatched bases?
(a) Base excision repair
(b) Nucleotide excision repair
(c) Mismatch repair
(d) Homologous recombination
Answer: (c) Mismatch repair
26. The enzyme telomerase is critical for:
(a) DNA replication
(b) Maintaining telomere length
(c) RNA splicing
(d) Protein synthesis
Answer: (b) Maintaining telomere length
27. In eukaryotic transcription, TFIIH is responsible for:
(a) Promoter recognition
(b) Helicase activity and phosphorylation of RNA polymerase II
(c) mRNA capping
(d) Polyadenylation
Answer: (b) Helicase activity and phosphorylation of RNA polymerase II
28. The Holliday junction is an intermediate structure in:
(a) DNA replication
(b) Homologous recombination
(c) Transcription elongation
(d) RNA splicing
Answer: (b) Homologous recombination
29. The role of microRNAs (miRNAs) in gene regulation is to:
(a) Enhance transcription
(b) Silence gene expression by targeting mRNA
(c) Promote DNA replication
(d) Stabilize chromatin
Answer: (b) Silence gene expression by targeting mRNA
30. Which technique is used to detect specific RNA molecules in a sample?
(a) Southern blotting
(b) Northern blotting
(c) Western blotting
(d) Eastern blotting
Answer: (b) Northern blotting
31. The enzyme reverse transcriptase is used to synthesize:
(a) DNA from RNA
(b) RNA from DNA
(c) Protein from mRNA
(d) DNA from protein
Answer: (a) DNA from RNA
32. The role of the D-loop in mitochondrial DNA replication is to:
(a) Initiate transcription
(b) Serve as the replication origin
(c) Facilitate RNA splicing
(d) Promote translation
Answer: (b) Serve as the replication origin
33. In prokaryotes, the -35 and -10 regions of the promoter are recognized by:
(a) RNA polymerase core enzyme
(b) Sigma factor
(c) Rho factor
(d) DNA polymerase
Answer: (b) Sigma factor
34. The process of RNA interference (RNAi) involves:
(a) DNA methylation
(b) Small interfering RNAs (siRNAs)
(c) Histone acetylation
(d) Protein phosphorylation
Answer: (b) Small interfering RNAs (siRNAs)
35. Which protein is involved in the recognition of DNA damage during nucleotide excision repair?
(a) XPA
(b) MutS
(c) RecA
(d) DNA ligase
Answer: (a) XPA
36. The role of the cap-binding complex (CBC) in eukaryotic mRNA is to:
(a) Facilitate splicing
(b) Promote nuclear export
(c) Initiate DNA replication
(d) Stabilize DNA
Answer: (b) Promote nuclear export
37. In E. coli, the Dam methylase methylates DNA at:
(a) GATC sequences
(b) CG islands
(c) TA repeats
(d) AT-rich regions
Answer: (a) GATC sequences
38. The role of the SWI/SNF complex in eukaryotic gene regulation is to:
(a) Methylate histones
(b) Remodel chromatin structure
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (b) Remodel chromatin structure
39. Which of the following is a hallmark of epigenetic regulation?
(a) DNA sequence alteration
(b) Histone modification
(c) RNA splicing
(d) Protein degradation
Answer: (b) Histone modification
40. The enzyme responsible for adding the poly-A tail to eukaryotic mRNA is:
(a) Poly-A polymerase
(b) RNA polymerase II
(c) Spliceosome
(d) Telomerase
Answer: (a) Poly-A polymerase
41. In prokaryotes, the transcription-translation coupling occurs because:
(a) There is no nuclear membrane
(b) RNA polymerase is faster
(c) Ribosomes are larger
(d) DNA is single-stranded
Answer: (a) There is no nuclear membrane
42. The role of the Tus-Ter complex in E. coli is to:
(a) Initiate replication
(b) Terminate replication
(c) Repair DNA damage
(d) Promote transcription
Answer: (b) Terminate replication
43. Which of the following is a key component of the eukaryotic transcription pre-initiation complex?
(a) TFIIA
(b) Sigma factor
(c) Rho factor
(d) DNA ligase
Answer: (a) TFIIA
44. The technique used to identify protein-DNA interactions is:
(a) ChIP (Chromatin Immunoprecipitation)
(b) Western blotting
(c) Northern blotting
(d) PCR
Answer: (a) ChIP (Chromatin Immunoprecipitation)
45. In eukaryotic DNA replication, the role of the Fen1 enzyme is to:
(a) Unwind DNA
(b) Remove RNA primers
(c) Synthesize DNA
(d) Join DNA fragments
Answer: (b) Remove RNA primers
46. The role of the L1 retrotransposon in the human genome is to:
(a) Promote transcription
(b) Facilitate mobile genetic element insertion
(c) Repair DNA damage
(d) Enhance translation
Answer: (b) Facilitate mobile genetic element insertion
47. Which of the following is a key regulator of the eukaryotic cell cycle and DNA replication?
(a) Cyclin-dependent kinase (CDK)
(b) RNA polymerase
(c) Spliceosome
(d) Ribosome
Answer: (a) Cyclin-dependent kinase (CDK)
48. The process of DNA methylation in eukaryotes primarily occurs at:
(a) CpG islands
(b) AT-rich regions
(c) GATC sequences
(d) TA repeats
Answer: (a) CpG islands
49. The role of the eIF2 complex in eukaryotic translation is to:
(a) Recruit tRNA to the ribosome
(b) Initiate translation by binding GTP
(c) Terminate translation
(d) Elongate the polypeptide chain
Answer: (b) Initiate translation by binding GTP
50. The technique used to study gene expression at the single-cell level is:
(a) RT-PCR
(b) Single-cell RNA sequencing
(c) Southern blotting
(d) Gel electrophoresis
Answer: (b) Single-cell RNA sequencing
51. In prokaryotes, the antiterminator protein in the trp operon is:
(a) Trp repressor
(b) Attenuator
(c) Anti-terminator tRNA
(d) Rho factor
Answer: (c) Anti-terminator tRNA
52. The role of the CTCF protein in eukaryotic gene regulation is to:
(a) Act as a transcription factor
(b) Organize chromatin loops
(c) Methylate DNA
(d) Synthesize RNA
Answer: (b) Organize chromatin loops
53. Which enzyme is responsible for resolving Holliday junctions during homologous recombination?
(a) RecA
(b) RuvC
(c) DNA ligase
(d) Helicase
Answer: (b) RuvC
54. The role of the 3’ untranslated region (3’ UTR) in eukaryotic mRNA is to:
(a) Initiate transcription
(b) Regulate mRNA stability and translation
(c) Facilitate splicing
(d) Promote DNA replication
Answer: (b) Regulate mRNA stability and translation
55. The technique used to knock out a specific gene in a model organism is:
(a) RNAi
(b) CRISPR-Cas9
(c) Northern blotting
(d) Western blotting
Answer: (b) CRISPR-Cas9
56. In E. coli, the role of the DnaA protein is to:
(a) Synthesize RNA primers
(b) Initiate DNA replication at oriC
(c) Repair DNA damage
(d) Terminate transcription
Answer: (b) Initiate DNA replication at oriC
57. The role of the exosome complex in eukaryotic cells is to:
(a) Degrade RNA
(b) Synthesize RNA
(c) Repair DNA
(d) Translate mRNA
Answer: (a) Degrade RNA
58. Which of the following is a key feature of the lac operon’s catabolite activation?
(a) Binding of cAMP-CAP complex to the promoter
(b) Binding of the repressor to the operator
(c) Methylation of the promoter
(d) Phosphorylation of RNA polymerase
Answer: (a) Binding of cAMP-CAP complex to the promoter
59. The role of the cohesin complex in eukaryotic cells is to:
(a) Promote DNA replication
(b) Hold sister chromatids together
(c) Facilitate transcription
(d) Repair DNA breaks
Answer: (b) Hold sister chromatids together
60. In prokaryotes, the role of the rho-independent terminator is to:
(a) Form a hairpin loop in RNA
(b) Recruit RNA polymerase
(c) Initiate DNA replication
(d) Promote splicing
Answer: (a) Form a hairpin loop in RNA
61. The technique used to study protein-protein interactions is:
(a) Co-immunoprecipitation
(b) Southern blotting
(c) Northern blotting
(d) PCR
Answer: (a) Co-immunoprecipitation
62. In eukaryotic translation, the release factor eRF1 is responsible for:
(a) Initiating translation
(b) Recognizing stop codons
(c) Elongating the polypeptide chain
(d) Binding tRNA
Answer: (b) Recognizing stop codons
63. The role of the HMG-box proteins in gene regulation is to:
(a) Methylate DNA
(b) Bend DNA to facilitate transcription factor binding
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (b) Bend DNA to facilitate transcription factor binding
64. Which of the following is a hallmark of non-homologous end joining (NHEJ)?
(a) Error-prone DNA repair
(b) Template-dependent repair
(c) Occurs only in G1 phase
(d) Requires homologous DNA
Answer: (a) Error-prone DNA repair
65. The role of the polycomb group (PcG) proteins in eukaryotes is to:
(a) Promote transcription
(b) Silence genes through chromatin modification
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (b) Silence genes through chromatin modification
66. In prokaryotes, the role of the Fis protein is to:
(a) Regulate DNA replication and transcription
(b) Repair DNA damage
(c) Synthesize RNA primers
(d) Promote translation
Answer: (a) Regulate DNA replication and transcription
67. The technique used to quantify gene expression in real-time is:
(a) RT-PCR
(b) qPCR (Quantitative PCR)
(c) Southern blotting
(d) Western blotting
Answer: (b) qPCR (Quantitative PCR)
68. The role of the RISC complex in RNA interference is to:
(a) Synthesize siRNAs
(b) Cleave target mRNA
(c) Methylate DNA
(d) Promote transcription
Answer: (b) Cleave target mRNA
69. In eukaryotes, the role of the C-terminal domain (CTD) of RNA polymerase II is to:
(a) Bind to the promoter
(b) Coordinate transcription with RNA processing
(c) Synthesize RNA primers
(d) Repair DNA damage
Answer: (b) Coordinate transcription with RNA processing
70. The role of the RecBCD complex in E. coli is to:
(a) Initiate DNA replication
(b) Process DNA ends for homologous recombination
(c) Synthesize RNA
(d) Terminate transcription
Answer: (b) Process DNA ends for homologous recombination
71. Which of the following is a key feature of the SOS response in bacteria?
(a) Induction of DNA repair genes
(b) Inhibition of DNA replication
(c) Promotion of transcription
(d) Degradation of RNA
Answer: (a) Induction of DNA repair genes
72. The role of the G-quadruplex structure in DNA is to:
(a) Promote replication
(b) Regulate gene expression
(c) Facilitate splicing
(d) Stabilize mRNA
Answer: (b) Regulate gene expression
73. In eukaryotes, the role of the enhancer elements is to:
(a) Terminate transcription
(b) Recruit transcription factors to increase gene expression
(c) Synthesize RNA primers
(d) Repair DNA damage
Answer: (b) Recruit transcription factors to increase gene expression
74. The technique used to study DNA methylation patterns is:
(a) Bisulfite sequencing
(b) Northern blotting
(c) Western blotting
(d) PCR
Answer: (a) Bisulfite sequencing
75. In prokaryotes, the role of the IHF (Integration Host Factor) protein is to:
(a) Bend DNA to facilitate protein binding
(b) Synthesize RNA
(c) Repair DNA damage
(d) Promote translation
Answer: (a) Bend DNA to facilitate protein binding
76. The role of the DEAD-box helicases in eukaryotic cells is to:
(a) Unwind RNA secondary structures
(b) Repair DNA damage
(c) Synthesize DNA
(d) Promote transcription
Answer: (a) Unwind RNA secondary structures
77. In eukaryotic translation, the role of the eEF2 factor is to:
(a) Initiate translation
(b) Promote translocation of the ribosome
(c) Recognize stop codons
(d) Bind tRNA
Answer: (b) Promote translocation of the ribosome
78. The role of the MSH2-MSH6 complex in DNA repair is to:
(a) Recognize mismatched bases
(b) Excise damaged nucleotides
(c) Join DNA fragments
(d) Unwind DNA
Answer: (a) Recognize mismatched bases
79. The technique used to study chromatin structure is:
(a) ChIP-seq
(b) Northern blotting
(c) Western blotting
(d) RT-PCR
Answer: (a) ChIP-seq
80. The role of the lncRNAs (long non-coding RNAs) in gene regulation is to:
(a) Code for proteins
(b) Regulate chromatin structure and gene expression
(c) Synthesize DNA
(d) Repair RNA damage
Answer: (b) Regulate chromatin structure and gene expression
81. In prokaryotes, the role of the HU protein is to:
(a) Compact DNA
(b) Synthesize RNA
(c) Repair DNA damage
(d) Promote translation
Answer: (a) Compact DNA
82. The role of the telomeric repeat-binding factor (TRF2) in eukaryotes is to:
(a) Promote telomere elongation
(b) Protect telomere ends from degradation
(c) Initiate DNA replication
(d) Facilitate transcription
Answer: (b) Protect telomere ends from degradation
83. The technique used to study protein-RNA interactions is:
(a) CLIP (Cross-linking Immunoprecipitation)
(b) Southern blotting
(c) Western blotting
(d) PCR
Answer: (a) CLIP (Cross-linking Immunoprecipitation)
84. The role of the SMN protein in eukaryotic cells is to:
(a) Assemble snRNPs for splicing
(b) Synthesize RNA
(c) Repair DNA damage
(d) Promote translation
Answer: (a) Assemble snRNPs for splicing
85. In prokaryotes, the role of the LexA protein is to:
(a) Promote transcription
(b) Repress SOS response genes
(c) Synthesize RNA primers
(d) Repair DNA damage
Answer: (b) Repress SOS response genes
86. The role of the CTCF-binding sites in the genome is to:
(a) Promote DNA replication
(b) Organize chromatin domains
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (b) Organize chromatin domains
87. The technique used to study DNA-protein interactions at a genome-wide level is:
(a) ChIP-seq
(b) Northern blotting
(c) Western blotting
(d) RT-PCR
Answer: (a) ChIP-seq
88. In eukaryotic translation, the role of the eIF4E protein is to:
(a) Bind the 5’ cap of mRNA
(b) Promote ribosome translocation
(c) Recognize stop codons
(d) Synthesize tRNA
Answer: (a) Bind the 5’ cap of mRNA
89. The role of the XPC protein in nucleotide excision repair is to:
(a) Recognize DNA damage
(b) Excise damaged nucleotides
(c) Join DNA fragments
(d) Unwind DNA
Answer: (a) Recognize DNA damage
90. The technique used to study DNA replication dynamics is:
(a) BrdU labeling
(b) Northern blotting
(c) Western blotting
(d) RT-PCR
Answer: (a) BrdU labeling
91. The role of the piRNAs (Piwi-interacting RNAs) in eukaryotic cells is to:
(a) Promote transcription
(b) Silence transposable elements
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (b) Silence transposable elements
92. In prokaryotes, the role of the DnaK protein is to:
(a) Act as a molecular chaperone
(b) Synthesize RNA
(c) Repair DNA damage
(d) Promote transcription
Answer: (a) Act as a molecular chaperone
93. The role of the TFIIS factor in eukaryotic transcription is to:
(a) Promote transcription elongation through stalled RNA polymerase
(b) Initiate transcription
(c) Terminate transcription
(d) Repair DNA damage
Answer: (a) Promote transcription elongation through stalled RNA polymerase
94. The technique used to study RNA secondary structure is:
(a) SHAPE (Selective 2’-Hydroxyl Acylation analyzed by Primer Extension)
(b) Southern blotting
(c) Western blotting
(d) PCR
Answer: (a) SHAPE (Selective 2’-Hydroxyl Acylation analyzed by Primer Extension)
95. The role of the H-NS protein in prokaryotes is to:
(a) Silence gene expression by binding DNA
(b) Promote transcription
(c) Synthesize RNA
(d) Repair DNA damage
Answer: (a) Silence gene expression by binding DNA
96. In eukaryotes, the role of the FACT complex is to:
(a) Facilitate chromatin transcription
(b) Synthesize RNA
(c) Repair DNA damage
(d) Promote translation
Answer: (a) Facilitate chromatin transcription
97. The role of the MutH protein in E. coli mismatch repair is to:
(a) Recognize mismatched bases
(b) Cleave unmethylated DNA strands
(c) Synthesize DNA
(d) Unwind DNA
Answer: (b) Cleave unmethylated DNA strands
98. The technique used to study genome-wide methylation patterns is:
(a) Whole-genome bisulfite sequencing
(b) Northern blotting
(c) Western blotting
(d) RT-PCR
Answer: (a) Whole-genome bisulfite sequencing
99. The role of the eIF3 complex in eukaryotic translation is to:
(a) Recruit the ribosome to mRNA
(b) Promote translocation
(c) Recognize stop codons
(d) Synthesize tRNA
Answer: (a) Recruit the ribosome to mRNA
100. In prokaryotes, the role of the GreA and GreB proteins is to:
(a) Promote transcription elongation by rescuing stalled RNA polymerase
(b) Initiate transcription
(c) Terminate transcription
(d) Repair DNA damage
Answer: (a) Promote transcription elongation by rescuing stalled RNA polymerase
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