An mRNA that contains the coding sequence for two or more structural genes is called a
A. polyrepressor mRNA.
B. polyintronic mRNA.
C. polyextronic mRNA.
D. polyexpressive mRNA.
E. polycistronic mRNA.
Answer: E
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In prokaryotes, the RNA polymerase holoenzyme consists of
A. the core polymerase plus two alpha subunits. B. the core polymerase plus two beta subunits. C. the core polymerase plus two alpha subunits, two beta subunits, and a sigma subunit. D. the core polymerase plus a sigma subunit. E. two alpha subunits, two beta subunits, and two sigma subunits.
How does DNA differ from RNA?
A. RNA uses only purines B. RNA uses a different five-carbon sugar C. RNA has a contains different sized phosphate groups D. RNA has multiple bases attached to the sugar
Which of the following matings can take place (assuming F' has the complete F factor)?
a) F' x F - b) Hfr x F' c) Hfr x F+ d) HFr x Hfr
For each of the following, indicate whether the individual folded polypeptide chain forms a globular (G) or fibrous (F) protein molecule
A. keratin B. lysozyme C. elastin D. collagen E. hemoglobin F. actin