Life Sciences Multiple Choice Questions on “RNA”.
1. Molecules which play the key role in the transfer of genetic information during protein synthesis are ___________
A. DNA
B. RNA
C. Nucleic acid
D. Lipids
Answer: B
Clarification: DNA has all the information which is confined to the nucleus, it is only transferred with the help of RNA during protein synthesis. RNA also has a diverse function in the body which includes the enzymatic activity of ribozyme and storage of genetic information in RNA viruses.
2. Double helix formed by RNA is more stable than DNA.
A. True
B. False
Answer: A
Clarification: The difference in their thermal stability is not clearly known but double-stranded helical RNA needs higher temperature for denaturation than DNA.
3. Which form of structure has been adopted by RNA?
A. A-form
B. B-form
C. Z-form
D. D-form
Answer: A
Clarification: Double helical track in RNA is generally short and formed by an A-form structure which differs from B-form adopted by DNA double helix.
4. Name the RNA molecules which is used to carry genetic information copied from DNA?
A. tRNA
B. mRNA
C. rRNA
D. snRNA
Answer: B
Clarification: Each type of RNA functions differently, among them mRNA which is also known as messenger RNA carries genetic information from DNA in the form of series of a three-base codon, which specifies the amino acid.
5. Which of the following RNA molecule convert information stored in the nucleic acid to protein?
A. mRNA
B. snRNA
C. rRNA
D. tRNA
Answer: D
Clarification: Transfer RNA (tRNA. plays a key role in protein biosynthesis and known as adapter tRNA. It acts as an interface between nucleic acid language and protein language. Additionally, it also participates in reverse transcription as a primer.
6. Name the secondary structure of tRNA?
A. Cloverleaf
B. L-shaped
C. Duplex
D. Triple Helix
Answer: A
Clarification: Based on their primary sequence tRNA folds into cloverleaf like secondary structure with well-defined loops and stems while tertiary structure further modified into the L-shaped structure.
7. Name the RNA molecule which takes part in the formation of the ribosome?
A. mRNA
B. tRNA
C. rRNA
D. gRNA
Answer: C
Clarification: rRNA is also known as ribosomal RNA which is a key component in the formation of a ribosome. rRNA molecules along with the ribosomal proteins in the nucleolus form pre-ribosomal subunit 40S and 60S respectively.
8. Which of the following rRNA molecules have peptidyl transferase activity in prokaryotes?
A. 23S rRNA
B. 28S rRNA
C. 5S rRNA
D. 18S rRNA
Answer: A
Clarification: rRNA molecules have several roles in protein synthesis, one of them is peptidyl transferase activity. In prokaryotes, 50 subunit has 23S rRNA which has a catalytic role and forms a part of peptidyl transferase activity. Similarly, eukaryotes have 28S rRNA in 60 subunits.
9. Which of the following statement is Incorrect about SnRNA?
A. It is small nuclear RNA
B. It helps in RNA splicing
C. It is also called snurps
D. It functions in RNA editing