If you wished to study the SOS response in Escherichia coli, which of the following experimental procedures could be used?
A. Transfer log phase cells from complete medium to thymine minimal medium.
B. Inactivate genes that encode DNA polymerases.
C. Expose cells to nonionizing radiation for 20 minutes.
D. Expose cells to ionizing radiation for 10 minutes.
E. All of the choices are correct.
Answer: E
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A phylogenetic species comprises ____
a. populations that share a recent evolutionary history b. individuals that share a recent evolutionary history c. interbreeding populations that are reproductively isolated d. individuals that share measurable traits that distinguish them e. one large gene pool subdivided into local populations
Which plants are best adapted for very dry, hot environments such as deserts?
A) C2 plants B) C3 plants C) C4 plants D) CAM plants
Newborn animals that closely resemble the adults of their species undergo ________ development
Fill in the blank(s) with correct word
The cancer gene ras produces mRNA containing an extra exon that includes a number of UAA codons. Cancer cells produce ras mRNA missing this exon. This mistake most likely is due to a mistake by
A) a chemical mutagen. B) DNA polymerase. C) photolyases. D) snRNPs. E) UV radiation.