In fermentation,
A. hydrogen combines with pyruvic acid.
B. pyruvic acid is changed to an amino acid.
C. sugar is changed to acetyl.
D. pyruvic acid is converted to hydrogen.
A. hydrogen combines with pyruvic acid.
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Most body heat in endotherms is derived from _____ while most body heat in ectotherms is derived from ______.
A. metabolic processes, metabolic processes B. metabolic processes, their environment C. their environment, metabolic processes D. their environment, their environment E. fur, insulating scales
One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. Adequate amounts of pepsin are already manufactured by the pancreas. B. Only the pepsinogen version is able to stabilize fat-water emulsions. C. Pepsin is denatured and rendered inactive in solutions with low pH. D. If cells produced active pepsin, they would digest their own cellular proteins.
Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
The presence of DNA is not one of the major characteristics of life. Why, then, might scientists look for the presence of DNA to help confirm the existence of life?
What will be an ideal response?