Which of the following is one way in which the environment may play a role in development?
a. The environment changes the segments in which Hox genes are expressed.
b. The presence or absence of neural crest cells in different species is environmentally deter-mined.
c. The environment directly induces gene duplications
d. Environmental conditions may change the timing of developmental changes.
D
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Several new materials have been developed for use in the microbiology lab. These materials must be sterilized before use, but cannot withstand a temperature over 60oC and can't be exposed to water. Which method of sterilization would be applicable?
A. Oven-dry heat B. UV radiation C. Steam autoclave D. Ionizing radiation
Production of urine in the nephron begins with
a. filtration. b. tubular reabsorption. c. tubular secretion. d. tubular modification. e. active reabsorption.
The letter “E” in the above figure represents
a. sclerenchyma fibers. b. parenchyma. c. xylem. d. epidermis. e. phloem.
Does the mimicry of California newts by the yellow-eyed salamander represent a confirmed example of co-evolution?
a. Yes, the evolution of yellow-eyed salamanders is tightly linked to changes in California newts. b. Yes, body coloration in both model and mimic is heritable. c. No, there is no evidence to date that California newts respond to evolutionary change in yel-low-eyed salamanders. d. No, yellow-eyed salamanders are only a subspecies; not the entire species to which yel-low-eyed salamanders belong is coevolving with California salamanders.