A(n) ________ has been used to estimate that humans began to wear clothing between 83,000 and 170,000 years ago
A) parsimony analysis
B) outgroup comparison
C) molecular clock
Answer: C
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Which of the following is at the highest energy level?
A. A reaction center chlorophyll that has received the energy from a blue-light photon B. A reaction center chlorophyll that has received the energy from a red-light photon C. A reaction center chlorophyll that has received the energy from a green-light photon
According to fossil evidence, Tiktaalik either crawled or paddled in shallow, tropical streams, approximately 380 mya. These streams may have occasionally become anaerobic, but fossil structures in Tiktaalik indicate it could have what adaptation or selective advantage in these conditions?
A. It could easily crawl long distances to find new water habitats when needed. B. All of the answer choices are correct. C. It could swim better than fish with the adaptation for both gills and lungs. D. It could lift and support its head to breath air with its lungs. E. It could feed equally well on aquatic foods and terrestrial foods.
In Drosophila, mutation screening usually involves use of a balancer chromosome that includes three elements: a set of overlapping inversions, an easily recognized dominant mutation, and a recessive lethal mutation that prevents balancer homozygotes
from surviving. Which one, or combination, of these elements is necessary and sufficient to suppress crossovers? A) inversions B) dominants C) lethal recessive D) inversions plus dominant E) lethal plus inversions
Which of the following is a sterilizing agent?
A) ozone B) hydrogen peroxide C) peracetic acid D) dish soap E) ozone and hydrogen peroxide