The antibiotic cycloheximide binds to the 60S subunit of the ribosome as shown in Figure 20.2. The effect is to
a. Prevent mRNA-ribosome binding in eukaryotes.
b. Prevent peptide bond formation in prokaryotes.
c. Prevent polypeptide elongation in eukaryotes.
d. Prevent transcription in prokaryotes.
e. Prevent ribosome formation in bacteria.
Ans: c. Prevent polypeptide elongation in eukaryotes.
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In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
In a woody stem, secondary xylem and secondary phloem can be produced by the
A. vascular bundle. B. casparian strip. C. vascular cambium. D. sieve tube. E. companion cells.
Of what advantage is it to have a multiple cloning site (multiple unique restriction sites) embedded in the lacZ component of a plasmid?
What will be an ideal response?
About ____ species of birds have been described
a. 1,000 b. 2,000 c. 4,500 d. 9,000 e. 20,000