21. A mutation in one gene that counteracts the effects of a mutation in another gene is known as a: (A) temperature-sensitive mutation. (B) recessive mutation. (C) suppressor mutation. (D) conditional mutation. (E) None of these.

21. A mutation in one gene that counteracts the effects of a mutation in another gene is known as a:
(A) temperature-sensitive mutation.
(B) recessive mutation.
(C) suppressor mutation.
(D) conditional mutation.
(E) None of these.

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B1 · 2025/09/18

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1. 題目解析這道題目考察的是基因突...

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18. Which of the following descriptions is false ? (A) The double helix of DNA in the B-form is stabilized by nonspecific base-stacking interaction between two adjacent bases in the same strand. (B) The phosphodiester bond that joins adjacent nucleotides in DNA associates ionically with metal ions, polyamines, and proteins. (C) The phosphodiester bond that joins adjacent nucleotides in DNA is susceptible to alkaline hydrolysis. (D) The pentoses in nucleic acids do not undergo interconversion of the straight-chain form and the ring form. (E) The size and base composition of a double-stranded DNA are factors that affect the 'melting temperature of DNA.

21. A mutation in one gene that counteracts the effects of a mutation in another gene is known as a: (A) temperature-sensitive mutation. (B) recessive mutation. (C) suppressor mutation. (D) conditional mutation. (E) None of these.

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21. A mutation in one gene that counteracts the effects of a mutation in another gene is known as a:
(A) temperature-sensitive mutation.
(B) recessive mutation.
(C) suppressor mutation.
(D) conditional mutation.
(E) None of these.