An examination of the arrangement of bones in the hand is an example of a(n) ____
a. ecological study
b. taxonomic study
c. anatomical study
d. physiological study
e. homeostatic study
ANSWER: c
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A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2
phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle? A) 2.5 hours B) 4 hours C) 6.4 hours D) 8 hours E) 13.3 hours
The majority of crustaceans live in
a. bodies of freshwater. b. tropical rain forests. c. marine habitats. d. wetlands. e. grasslands.
Crop sunflowers are attacked by many fungal pathogens, such as downy mildew and Sclerotinia, resulting in economic losses of millions of dollars per year. What genes would be best to target for the development of new fungus-killing crop treatments (fungicides)?
A. genes encoding chitin proteins that are shared by downy mildew and Sclerotinia, but absent in sunflower and humans B. genes encoding metabolite proteins that are shared by downy mildew, Sclerotinia, and humans, but absent in sunflower C. genes encoding basic development proteins that are shared by downy mildew, Sclerotinia, sunflower, and humans D. genes encoding growth proteins that are shared by downy mildew, Sclerotinia, and sunflower, but absent in humans
Which of the following statements about algae is FALSE?
A) They use light as their energy source. B) They use CO2 as their carbon source. C) They produce oxygen from hydrolysis of water. D) All are unicellular. E) Some are capable of sexual reproduction.