Virginia was working as an undergraduate lab technician, and the graduate student she was working with instructed her to take some E. coli, and treat the culture with MgCl2 and CaCl2 to make the cells competent. Once Virginia produced the competent cells, she was able to
A. make them susceptible to bacteriophage
B. make them pass their DNA to a recipient cell via conjugation
C. make them take up naked DNA from their environment
D. make them replicate their own DNA without an origin of replication
E. None of the answers are correct.
Answer: C
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Suppose the pair-rule genes were inactivated in Drosophila embryos. What is the likely result of the experiment?
A) The embryos would develop normally. B) The embryos would lack several segments. C) The embryos would have impaired anterior-posterior polarity. D) The embryos would have missing alternate segments.
An anaerobic process does NOT require
A. water. B. oxygen. C. energy. D. phosphate.
Which of the following is not a subfield of microbiology?
A) bacteriology B) botany C) clinical microbiology D) virology
What substance do the secretory cells in the lung release?
A. Carbon dioxide B. Myoglobin C. Oxyhemoglobin D. Surfactant E. Carbonic anhydrase