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 replicate their own DNA without an origin of replication
B. make them susceptible to bacteriophage
C. make them pass their DNA to a recipient cell via conjugation
D. make them take up naked DNA from their environment
E. None of these are correct
D. make them take up naked DNA from their environment
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The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.
The early symptoms of rabies generally begin
A. 1 day after viral entry. B. 1-2 months after viral entry. C. 6 months after viral entry. D. 1 year after viral entry.
Apples that we find in the grocery store today are much larger and sweeter than those found in the wild hundreds of years ago. Which process is responsible for this change?
A. Resistance to pesticides B. Artificial selection C. Genetic drift D. Survival of the fittest
The great adaptive radiation of hominoids in the
Miocene is attributable to a. the proliferation of complex forests. b. an extended cooling and drying trend. c. the advent of bipedalism. d. the evolution of a large brain. e. changes in tooth structure.