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.
Last updated
55 questions · page 3 of 3
- A. Thymine
- B. Adonine
- C. Guanine
- D. Cytosine
Explanation: DNA contains the following bases: adenine, guanine, cytosine, and thymine.
Correct answer: Thymine- A. TAC
- B. UAC
- C. AUG
- D. CCA
Explanation: Anticodons are as follow:A = U( in case of RNA)A=T ( in case of DNA)C=G( same in both cases)
Correct answer: UAC- A. Mg+ ions
- B. Na- ions
- C. Proteins
- D. Ribosomal RNA
Explanation: The attachment of two subunits of ribosomes on a single mRNA is controlled by Mg2+ ions.
Correct answer: Mg+ ions- A. 2
- B. 3
- C. 5
- D. 4
Explanation: Building blocks of nucleic acids, i.e., DNA and RNA. A nucleotide consists of a sugar molecule attached to a phosphate group and a…
Correct answer: 3- A. TAC
- B. ATC
- C. UAC
- D. UTC
Explanation: AUG is the start codon that signals ribosomes to place in the amino acid methionine because the tRNA that has methionine attached to it…
Correct answer: UAC- A. Transcription
- B. Replication
- C. Polymerization
- D. PCR
Explanation: The process by which DNA is copied to RNA is called transcription.
Correct answer: Transcription- A. AAUOCGT
- B. UUAACGA
- C. TTAACGA
- D. UUTTCGT
Explanation: RNA polymerase uses one of the DNA strands (the template strand) as a template to make a new, complementary RNA molecule.
Correct answer: UUAACGA- A. Poly genes
- B. Genome
- C. Promoter
- D. Pleiotropy
Explanation: The first step in transcription is initiation, when the RNA pol binds to the DNA upstream (5′) of the gene at a specialized sequence…
Correct answer: Promoter- A. 30S and 40S
- B. 70S and 10S
- C. 50S and 30S
- D. 60S and 40S
Explanation: Ribosomes are non-membrane-bounded organelles that are present in large numbers in all living cells and serve as the site of protein…
Correct answer: 60S and 40S- A. Arginine
- B. Glutamine
- C. Tryptophan
- D. Valine
Explanation: A codon is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis.
Correct answer: Tryptophan51. Stop codons are:
- A. UAA,UAG,UGA
- B. UGC,UCG,AAA
- C. UUG,UCG,UCA
- D. UAA,UGC,UCA
Explanation: Stop codons are codons (triplets of nucleotides) in messenger RNA (mRNA) that signal the termination of protein synthesis.
Correct answer: UAA,UAG,UGA- A. Phagosome
- B. Perosome
- C. Polysome
- D. Punosome
Explanation: When multiple ribosomes are attached to a single mRNA molecule, it forms a structure called a polysome.
Correct answer: Polysome- A. Arginine
- B. Tryptophan
- C. Methionine Stop Codon
- D. 1-butene.
Explanation: In mitochondrial DNA, the codon AGG indeed codes for the amino acid arginine.
Correct answer: Arginine- A. 4
- B. 8
- C. 16
- D. 20
Explanation: If a codon consisted of only two nucleotides, there would be 4 possible combinations for each position (since there are 4 different…
Correct answer: 16- A. Nuclear envelope
- B. Chromosome
- C. rRNA
- D. Cytoplasm
Explanation: The nucleolus is a region within the nucleus of eukaryotic cells where ribosome synthesis occurs.
Correct answer: rRNA