There are mainly __________ types of tRNA?
Correct answer: B. 20
- 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. Some cells have additional isoacceptor tRNAs for the same amino acid, but the standard classification is based on 20 amino acids. Students may choose 25 by counting extra tRNA varieties rather than the main amino-acid-specific types.
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About Ribonucleic Acid (RNA)
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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