In a bacterial cell,the three genes of the lactose operon are
A) expressed continuously.
B) expressed when lactose synthesis is required.
C) expressed only in the presence of lactose.
D) never expressed,because they are pseudogenes.
Correct Answer:
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Q27: Ribosomal RNAs
A)are translated from DNA.
B)are synthesized by
Q28: The genetic code is
A)triplet,overlapping,and not universal.
B)triplet,non-overlapping,and universal.
C)quarternary,overlapping,and
Q29: The scientists who identified a set of
Q30: Parts of an mRNA molecule that are
Q31: A codon consists of three consecutive
A)DNA bases.
B)amino
Q33: _ consist of proteins and RNAs that
Q34: Transcription factors function in the expression of
Q35: Transcription and replication are alike in that
Q36: Which codon halts ribosomes?
A)UAG
B)AUG
C)UUU
D)ATG
Q37: The enzyme that synthesizes messenger RNA from
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