Free Ribonucleic Acid (RNA) MCQs with Answers
55 Ribonucleic Acid (RNA) MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Ribonucleic acid is generally a single-stranded nucleic acid containing ribose and uracil instead of thymine. Coverage includes mRNA, tRNA and rRNA, complementary base pairing, transcription and translation, and the differences between RNA and DNA in structure, location and biological function.
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55 questions · page 1 of 3
- A. It contains thymine in place of uracil
- B. It contains ribose and is usually single stranded
- C. It is always double stranded like DNA
- D. It contains deoxyribose and uracil
Explanation: RNA carries ribose, which has a hydroxyl group at carbon 2, and it is normally a single strand that can fold back on itself, as tRNA does…
Correct answer: It contains ribose and is usually single stranded- A. carry the genetic message out of the nucleus
- B. form the structural core of the ribosome
- C. unwind the DNA double helix
- D. bring the correct amino acid to the ribosome according to the codon being read
Explanation: Each tRNA carries an anticodon at one end and its matching amino acid at the other, so it acts as the adaptor that translates the language…
Correct answer: bring the correct amino acid to the ribosome according to the codon being read- A. carries a copy of the base sequence of a gene from the nucleus to the ribosome
- B. is folded into a clover leaf shape
- C. carries an anticodon at one end
- D. is the most abundant type of RNA in the cell
Explanation: Messenger RNA is transcribed from one strand of a gene and is read in triplets by the ribosome, so its length varies with the gene it…
Correct answer: carries a copy of the base sequence of a gene from the nucleus to the ribosome- A. A DNA copy of DNA
- B. An RNA copy of DNA
- C. A protein from DNA
- D. A DNA copy of RNA
Explanation: Transcription is the synthesis of RNA using DNA as a template, catalyzed by RNA polymerase.
Correct answer: An RNA copy of DNA- A. UAA
- B. AUG
- C. UAG
- D. UGA
Explanation: AUG codes for methionine and serves as the start codon, initiating protein synthesis.
Correct answer: AUG6. Introns are
- A. Coding sequences
- B. Non-coding sequences removed during splicing
- C. Found only in prokaryotes
- D. Essential for translation
Explanation: Introns are non-coding intervening sequences removed during RNA splicing; exons are joined together.
Correct answer: Non-coding sequences removed during splicing- A. AUG
- B. UAA
- C. UUU
- D. GGC
Explanation: UAA, UAG, and UGA are stop codons (nonsense codons) that terminate translation.
Correct answer: UAA- A. DNA to rRNA to tRNA to mRNA
- B. rRNA to tRNA to mRNA to DNA
- C. mRNA to tRNA to rRNA to DNA
- D. DNA to mRNA to tRNA to rRNA
Explanation: This is the order given in the official UHS answer key. Among the three RNAs the ranking is not disputed: ribosomal RNA is by far the most…
Correct answer: DNA to rRNA to tRNA to mRNA- A. Deoxyribose and thymine
- B. Double stranded and thymine
- C. Ribose and uracil
- D. Ribose and thymine
Explanation: RNA carries ribose, which has a hydroxyl group at carbon 2, and uses uracil in place of thymine, and it is normally single stranded.
Correct answer: Ribose and uracil- A. Messenger RNA
- B. Ribosomal RNA
- C. Transfer RNA
- D. Catalytic RNA (ribozyme)
Explanation: Ribosomal RNA accounts for roughly 80 per cent of the RNA in a cell, because every ribosome is built largely from it and a busy cell…
Correct answer: Ribosomal RNA- A. Carry genetic information for protein synthesis
- B. Stabilize ribosome
- C. Deliver amino acids
- D. Provide platform for proteins synthesis
Explanation: Messenger RNA is transcribed from a gene and carries that base sequence out of the nucleus to the ribosome, where it is read in triplets.
Correct answer: Carry genetic information for protein synthesis- A. 170
- B. 20
- C. 25
- D. 15
Explanation: In the basic genetic code, there are mainly 20 functional types of tRNA, each associated with one of the 20 standard amino acids.
Correct answer: 20- A. 3-4 %
- B. 10-20%
- C. 80%
- D. 90%
Explanation: Ribosomal RNA makes up about 80% of the total RNA in a typical cell because ribosomes contain a large amount of rRNA and cells have many…
Correct answer: 80%- A. Gene
- B. Anticodon
- C. Code
- D. Codon
Explanation: The anticodon is a three-base sequence on tRNA that pairs complementarily with a codon on mRNA during translation.
Correct answer: Anticodon- A. It produces another DNA molecule
- B. It produces mRNA
- C. It is a semi conservation process
- D. It occurs at surface of ribosomes
Explanation: Transcription uses one DNA strand as a template to synthesize a complementary RNA molecule, commonly mRNA for a protein-coding gene.
Correct answer: It produces mRNA- A. 3
- B. 4
- C. 5
- D. 2Health
Explanation: A furanose ring is a five-membered ring containing four carbon atoms and one oxygen atom, so ribofuranose has 4 ring carbons.
Correct answer: 4- A. The pentose sugar in it is Ribose.
- B. It contains Adenine Guanine Thymine and Cytosine
- C. It is present in the nucleoli
- D. It may be folded back on itself to give double helical characteristics.
Explanation: RNA contains ribose sugar and the bases adenine, guanine, cytosine and uracil, not thymine.
Correct answer: It contains Adenine Guanine Thymine and Cytosine- A. Polymer
- B. Polypeptide
- C. Polysomes
- D. Monomer
Explanation: A polysome, or polyribosome, is a group of ribosomes simultaneously attached to one mRNA molecule, allowing several copies of a…
Correct answer: Polysomes- A. Transcription
- B. Secretion
- C. Translation
- D. Division
Explanation: A polysome, or polyribosome, forms when several ribosomes simultaneously translate one mRNA molecule, allowing many copies of a protein to…
Correct answer: Translation- A. A
- B. B
- C. C
- D. D
Explanation: Option A correctly identifies X as amino acid, Y as tRNA and Z as mRNA. X (Amino Acid): The building blocks of proteins.
Correct answer: ARibonucleic Acid (RNA) MCQs: common questions
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