There Are 61 MRNA Codons That Specify an Amino Acid

question 9

Multiple Choice

There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained by the fact that

• A) some tRNAs have anticodons that recognize four or more different codons.
• B) the rules for base pairing between the third base of a codon and tRNA are flexible.
• C) many codons are never used, so the tRNAs that recognize them are dispensable.
• D) the DNA codes for all 61 tRNAs but some are then destroyed.
• E) competitive exclusion forces some tRNAs to be destroyed by nucleases.

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Definitions:

Neonates

Refers to newborns, typically less than four weeks old.

Cephalocaudal Development

A pattern of growth in which development proceeds from the head downwards through the body, influencing motor skills and physical maturation.

Infants

Very young children, typically under one year of age, who are in the earliest stage of human development.

Arms

Limbs attached at the shoulder on the human body, primarily used for manual tasks and movement.