It is believed that the surfaces upon which the first nucleic acids were able to form were made of:
A. limestone
B. clay
C. granite
D. diamond
E. sand
Answer: B
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When blood leaves the heart, it first enters
A) capillaries. B) arterioles. C) venules. D) veins. E) arteries.
Recent studies have shown that some Clostridia species have peptidoglycan between an inner and outer membrane, and were therefore properly reclassed as Gram-negative because of their unrelatedness.
Answer the following statement true (T) or false (F)
The movement of molecules with/down a concentration gradient through transport proteins in the cell membrane is a type of
A.) selective transport. B.) osmosis. C.) energy expenditure. D.) facilitated diffusion.
Imagine that you conduct a phylogenetic analysis of sticklebacks and their relatives
You find that even though stickleback males are the only ones that show red coloration as a derived trait, female preference for red color is indeed found throughout the stickleback relatives. In sticklebacks, red color intensity in males is positively correlated with health, which led researchers to invoke the good genes model for the evolution of red coloration. Do your results change this conclusion in favor of sensory bias as an explanation? a. No, we can exclude sensory bias, as red coloration is still an honest indica-tor of male health. b. Yes, according to the new results the sensory bias model is the most parsi-monious explanation and good genes can be excluded. c. Not necessarily, one model does not exclude the other. d. If females have healthier offspring when they mate with red males, sensory bias can be excluded. e. A and D.