Molecular Biology and Genetic Engineering - Question Bank

1. In the context of molecular biology, what does 'gene expression' refer to?
A) The process of DNA replication
B) The process of synthesizing RNA from DNA and then protein from RNA
C) The process of DNA mutation
D) The process of DNA repair
2. What is the primary role of a promoter region in a gene?
A) To terminate transcription
B) To signal the start of transcription
C) To code for amino acids
D) To bind to tRNA
3. The process of modifying the expression of genes without altering the underlying DNA sequence is known as:
A) Genetic engineering
B) Gene therapy
C) Epigenetics
D) Recombinant DNA technology
4. Which of the following is a type of RNA that plays a role in regulating gene expression by silencing mRNA molecules?
A) mRNA
B) rRNA
C) tRNA
D) siRNA (small interfering RNA)
5. What is the main goal of DNA fingerprinting?
A) To determine the sequence of a gene
B) To identify unique patterns of DNA for forensic or diagnostic purposes
C) To amplify DNA
D) To synthesize proteins
6. What is the term for a segment of DNA that does not code for proteins but can regulate gene expression?
A) Exon
B) Intron
C) Regulatory DNA
D) Codon
7. Which molecule is responsible for carrying genetic information from the nucleus to the cytoplasm in eukaryotic cells?
A) DNA
B) mRNA
C) rRNA
D) tRNA
8. What is the study of the structure and function of proteins?
A) Genomics
B) Transcriptomics
C) Proteomics
D) Metabolomics
9. The process where genes are transferred from one generation to the next is called:
A) Mutation
B) Recombination
C) Heredity
D) Epigenetics
10. What is the term for the complete set of genes or genetic material present in a cell or organism?
A) Genome
B) Proteome
C) Transcriptome
D) Karyotype
11. Which of the following is a potential ethical concern related to genetic engineering?
A) Increased food production
B) Development of new medicines
C) Unforeseen ecological impacts
D) Improved crop resilience
12. What is the role of guide RNA (gRNA) in the CRISPR-Cas9 system?
A) To cut DNA
B) To repair DNA breaks
C) To direct the Cas9 enzyme to the target DNA sequence
D) To produce mRNA
13. What does the 'Cas9' component in the CRISPR-Cas9 system do?
A) Guides the complex to a specific DNA sequence
B) Cuts DNA at a targeted location
C) Synthesizes new DNA
D) Transcribes RNA
14. CRISPR-Cas9 is a revolutionary technology primarily used for:
A) DNA replication
B) Protein synthesis
C) Gene editing
D) RNA splicing
15. What is gene therapy?
A) A method to increase gene expression
B) A technique for gene sequencing
C) An experimental treatment that aims to treat or cure disease by modifying a person's genes
D) A process of gene replication
16. Which of the following is a common application of genetic engineering in agriculture?
A) Increasing crop yield
B) Enhancing nutritional value
C) Improving resistance to pests and diseases
D) All of the above
17. What is a genetically modified organism (GMO)?
A) An organism that reproduces sexually
B) An organism whose genetic material has been altered using genetic engineering techniques
C) An organism that produces antibiotics
D) An organism that lives in extreme environments
18. Which technology allows for the modification of genes in living organisms to change their characteristics?
A) Fermentation
B) Bioremediation
C) Genetic modification
D) Photosynthesis
19. What is the process of determining the precise sequence of nucleotides within a DNA molecule?
A) Gene cloning
B) DNA sequencing
C) Gene silencing
D) Gene mapping
20. What is the primary application of PCR in molecular biology?
A) Joining DNA fragments
B) Cutting DNA at specific sites
C) Amplifying small quantities of DNA
D) Separating DNA fragments by size
21. The technique used to amplify specific segments of DNA is known as:
A) Gel electrophoresis
B) Polymerase Chain Reaction (PCR)
C) DNA sequencing
D) Southern blotting
22. What is recombinant DNA?
A) DNA that has undergone mutation
B) DNA from a single organism
C) DNA that has been formed artificially by combining constituents from different organisms
D) DNA that is found only in prokaryotes
23. What is the process of joining DNA fragments together using an enzyme?
A) Restriction
B) Ligation
C) Replication
D) Transcription
24. A small, circular, extrachromosomal DNA molecule found in bacteria, often used in genetic engineering, is called a:
A) Chromosome
B) Plasmid
C) Genome
D) Gene
25. What is the process of inserting foreign DNA into a host cell called?
A) Transformation
B) Transduction
C) Conjugation
D) Recombination
26. Which enzyme is commonly used to cut DNA at specific recognition sites in genetic engineering?
A) DNA polymerase
B) Ligase
C) Restriction enzyme
D) Reverse transcriptase
27. What is genetic engineering?
A) The study of genes and heredity
B) The direct manipulation of an organism's genes using biotechnology
C) The process of DNA replication
D) The study of protein synthesis
28. A mutation that alters the reading frame of the mRNA sequence is called a:
A) Silent mutation
B) Missense mutation
C) Nonsense mutation
D) Frameshift mutation
29. Which type of mutation involves the substitution of a single nucleotide base?
A) Insertion
B) Deletion
C) Point mutation
D) Frameshift mutation
30. What is a change in the DNA sequence called?
A) Replication
B) Transcription
C) Translation
D) Mutation
31. The process by which a cell makes an identical copy of its DNA is called:
A) Transcription
B) Translation
C) Replication
D) Mutation
32. What is the primary function of ribosomal RNA (rRNA)?
A) Carrying genetic information
B) Transporting amino acids
C) Catalyzing peptide bond formation and forming ribosome structure
D) Regulating gene expression
33. What is the primary function of messenger RNA (mRNA)?
A) Transporting amino acids to the ribosome
B) Carrying the genetic code from DNA to the ribosome
C) Catalyzing peptide bond formation
D) Forming part of the ribosome structure
34. What is the primary function of transfer RNA (tRNA)?
A) Carrying genetic information from DNA to ribosomes
B) Catalyzing protein synthesis
C) Transporting specific amino acids to the ribosome
D) Forming the structural component of ribosomes
35. Which codon typically signals the start of protein synthesis?
A) UAA
B) UAG
C) UGA
D) AUG
36. How many possible codons are there in the genetic code?
A) 16
B) 32
C) 64
D) 128
37. The genetic code is read in triplets of nucleotides called:
A) Anticodons
B) Codons
C) Genes
D) Alleles
38. What are the coding regions within a gene that are expressed in the final mRNA molecule?
A) Introns
B) Promoters
C) Exons
D) Terminators
39. What are the non-coding regions within a gene that are removed during RNA splicing?
A) Exons
B) Introns
C) Codons
D) Anticodons
40. What is a segment of DNA that codes for a functional product, usually a protein?
A) Exon
B) Intron
C) Gene
D) Promoter
41. What is the name of the enzyme that synthesizes RNA during transcription?
A) DNA polymerase
B) RNA ligase
C) RNA polymerase
D) Topoisomerase
42. What is the name of the enzyme that synthesizes DNA during replication?
A) RNA polymerase
B) DNA ligase
C) DNA polymerase
D) Reverse transcriptase
43. The process of synthesizing protein from an mRNA template is called:
A) Replication
B) Translation
C) Transcription
D) Gene expression
44. The process of synthesizing RNA from a DNA template is called:
A) Replication
B) Translation
C) Transcription
D) Reverse transcription
45. In RNA, which base pairs with Adenine (A)?
A) Guanine (G)
B) Cytosine (C)
C) Thymine (T)
D) Uracil (U)
46. Which base pairs with Guanine (G) in DNA?
A) Adenine (A)
B) Cytosine (C)
C) Thymine (T)
D) Uracil (U)
47. Which base pairs with Adenine (A) in DNA?
A) Guanine (G)
B) Cytosine (C)
C) Thymine (T)
D) Uracil (U)
48. What are the four nucleotide bases found in DNA?
A) Adenine, Guanine, Cytosine, Uracil
B) Adenine, Guanine, Cytosine, Thymine
C) Adenine, Guanine, Uracil, Thymine
D) Cytosine, Guanine, Uracil, Thymine
49. Which molecule carries the genetic instructions for the development, functioning, growth, and reproduction of all known organisms and many viruses?
A) Ribonucleic acid (RNA)
B) Deoxyribonucleic acid (DNA)
C) Protein
D) Adenosine triphosphate (ATP)
50. What is the fundamental unit of heredity?
A) Chromosome
B) Gene
C) Allele
D) Genome
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