Carbon dioxide crosses the plasma membrane by simple diffusion. The rate at which carbon dioxide enters the cell is determined by the
A) amount of energy being produced by the cell.
B) amount of transport protein in the membrane.
C) concentration of carbon dioxide on each side of the membrane.
D) amount of oxygen being exported from the cell.
E) amount of carbon dioxide outside of the cell.
C
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Summarize the major steps involved in producing a muscle contraction beginning with motor neuron activity and
ending with sarcomere shortening. What will be an ideal response?
What molecule would be encoded by a DNA sequence?
A) fat B) monosaccharide C) nitrogenous base D) protein
Margarine usually is made by a process called_____, in which hydrogen atoms are added to carbon-carbon double bonds in the polyunsaturated fatty acids found in vegetable oils.
a. saturation b. esterification c. isomerization d. hydrogenation
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.