How many different codons in our genetic code specify amino acids?
a. 3
b. 20
c. 60
d. 61
e. 64
ANSWER: d
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Which of the following characteristics of the glmS riboswitch is also true of the TPP riboswitch?
A. The glmS riboswitch is a ribozyme. B. The structure of the riboswitch is the same, whether bound by ligand or not. C. The riboswitch lowers the rate of translation when bound to its metabolite ligand.
Segments of polypeptides that are retained following protein splicing are called
A) introns. B) exons. C) inteins. D) exteins. E) cleaved.
In the flower diagram shown above, the item labeled "6" is a(n)
a. style. b. sepal. c. receptacle. d. ovule. e. petal.
A defining characteristic of eukaryotic organisms is that they
A. have their transcription occurring in the cytoplasm and translation in the nucleus. B. carry out protein synthesis only in the presence of the cAMP molecule. C. use the leucine zipper primarily for the production of the amino acid tryptophan. D. have only operons to assist in gene expression. E. have their transcription occurring in the nucleus and translation in the cytoplasm.