Which of the following statements about the light reactions of photosynthesis is FALSE?
A) NADPH becomes oxidized to NADP+.
B) Chlorophyll (and other pigments) absorbs light energy, which excites electrons.
C) ATP is formed.
D) The splitting of water molecules provides a source of electrons.
E) An electron transport chain is used to create a proton gradient.
A
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The two chemicals released during the fight or flight stress response that are associated with the development of heart disease are _____.
A. high-density and low-density cholesterol B. adrenaline and epinephrine C. cortisol and epinephrine D. insulin and leptin
B has been HIV positive for several years. Recently, B began to experience some disturbing symptoms. B has begun to have problems with vision and motor control. Clinical tests indicate B's immune function is declining. What other viruses besides HIV might be causing B's problems? How might this be verified?
What will be an ideal response?
In species that reproduce via external fertilization:
a. males do not have to compete with each other for access to a female's eggs b. only females provide parental investment, in the form of the nutrition present in the egg c. sexual selection does not operate d. sperm and egg encounter each other outside of the female's body, typically in an aquatic environment e. none of these
In Hodags (mythical creatures of Wisconsin), brown fur (B) is dominant over gray fur (b) and long horns (H) are dominant over short horns (h). Two true-breeding hodags, one with brown fur and long horns and the other with gray fur and short horns mate and produce an F1. Two F1 individuals are mated. What proportion of the offspring will exhibit a phenotypic combination that is different from the
P generation? Assume the genes for fur color and horn length are on different chromosomes. A. 1/2 B. 9/16 C. 3/16 D. 6/16 E. 1/16