AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the three nucleotide sequence found on a tRNA molecule?
A
anti codon
B
codon
C
nitrogen base
D
nucleotide
Explanation: 

Detailed explanation-1: -At one end, the tRNA has an anticodon of 3’-UAC-5’, and it binds to a codon in an mRNA that has a sequence of 5’-AUG-3’ through complementary base pairing. The other end of the tRNA carries the amino acid methionine (Met), which is the the amino acid specified by the mRNA codon AUG.

Detailed explanation-2: -With RNA, the nucleotide base adenine always pairs with uracil (A and U), and guanine always pairs with cytosine (G and C). Some other codon and anticodon examples are: Methionine: the mRNA codon is AUG, and the tRNA anticodon is UAC. Lysine: the mRNA codon is AAG and the tRNA anticodon is UUC.

Detailed explanation-3: -anticodon – a sequence of three nucleotides on a tRNA molecule that bond to a complementary sequence on an mRNA molecule. The anticodon sequence determines the amino acid that the tRNA carries.

Detailed explanation-4: -Anticodon An anticodon is a trinucleotide sequence located at one end of a transfer RNA (tRNA) molecule, which is complementary to a corresponding codon in a messenger RNA (mRNA) sequence.

Detailed explanation-5: -A particular site on each tRNA forms a three-baseanticodon that is complementary to a specific codon on the mRNA.

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