NEET Biology: Molecular Basis of Inheritance — Practice Set 11

Q1. Which of the following is incorrect about DNA replication?

A. DNA replication is semi-conservative.
B. DNA polymerase synthesizes DNA in the 5' to 3' direction.
C. Both DNA strands are synthesized continuously.
D. Okazaki fragments are formed on the lagging strand.

Q2. Which of the following statements about DNA polymerase is incorrect?

A. DNA polymerase synthesizes new DNA in the 5' to 3' direction.
B. DNA polymerase removes RNA primers and replaces them with DNA.
C. DNA polymerase unwinds the DNA double helix.
D. Different types of DNA polymerases exist with specialized functions.

Q3. Which of the following is a function of the poly-A tail in eukaryotic mRNA?

A. Initiates translation
B. Protects mRNA from degradation
C. Facilitates splicing
D. Activates RNA polymerase

Q4. Which term describes the process of inserting foreign DNA into a host organism using a vector?

A. Gene therapy
B. Recombinant DNA technology
C. Mutation
D. Genetic drift

Q5. What is the role of UTRs (Untranslated Regions) in mRNA?

A. They encode proteins
B. They regulate translation and mRNA stability
C. They facilitate DNA replication
D. They bind to tRNA

Q6. Which of the following correctly describes the Shine-Dalgarno sequence?

A. It is a promoter sequence.
B. It helps in prokaryotic translation initiation.
C. It is found only in eukaryotic mRNA.
D. It signals termination of transcription.

Q7. Which of the following statements about the genetic code is correct?

A. The genetic code is ambiguous.
B. Each amino acid is coded by only one codon.
C. The genetic code is universal across most organisms.
D. Stop codons code for amino acids.

Q8. Which of the following correctly describes an operon?

A. An operon consists of multiple genes controlled by separate promoters.
B. Operons are commonly found in eukaryotic cells.
C. An operon is a cluster of genes regulated by a single promoter.
D. Operons do not require regulatory elements.

Q9. Which of the following statements about prokaryotic transcription is incorrect?

A. Prokaryotic transcription occurs in the cytoplasm.
B. Prokaryotic RNA polymerase requires a sigma factor for initiation.
C. Prokaryotic mRNA undergoes extensive post-transcriptional modifications.
D. Transcription and translation occur simultaneously in prokaryotes.

Q10. Which of the following is correct about mRNA?

A. mRNA is double-stranded.
B. mRNA carries amino acids to the ribosome.
C. mRNA carries genetic information from DNA to ribosomes.
D. mRNA is a component of ribosomes.

Biology — Molecular Basis of Inheritance

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Which of the following is incorrect about DNA replication?

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