20. Which type of RNA has 3' poly-adenylation tail? (A) tRNA (B) precursor messenger RNA (C) rRNA (D) mRNA

20. Which type of RNA has 3' poly-adenylation tail?
(A) tRNA
(B) precursor messenger RNA
(C) rRNA
(D) mRNA

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B1 · 2025/09/22

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5.Why does a DNA strand grow only in the 5' to 3' direction? (A)because DNA polymerase can only add nucleotides to the 3' end of the growing molecule. (B)because DNA polymerase can only add nucleotides to the 5' end of the growing molecule. (C)because the DNA molecule only unwinds in the 5' to 3' direction. (D)because DNA polymerase requires the addition of a starter nucleotide at the 5' end.

20. Which type of RNA has 3' poly-adenylation tail?
(A) tRNA
(B) precursor messenger RNA
(C) rRNA
(D) mRNA

詳解 (共 1 筆)

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