alleryStart learning →How many types of tRNA exist in the cytoplasm, depending on the species?
ATwenty to thirty types
BForty to sixty types
CSixty-one to sixty-four types
DTwo hundred or more types
Answer & Solution
Correct answer: B. Forty to sixty types
1. The tRNAs are structural RNAs transcribed from genes by RNA polymerase III.
2. Depending on the species, 40 to 60 types exist in the cytoplasm.
3. Twenty is the number of amino acids they deliver, not the number of tRNA types.
4. Sixty-one is the count of codons that specify amino acids, which is a property of the code rather than of the tRNA pool.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.5 Ribosomes and Protein Synthesis_
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