In the photosystem I reaction center, light energy captured by pigment molecules is passed to a special reaction center chlorophyll a called
A. P680.
B. P700.
C. chlorophyll I.
D. chlorophyll II.
E. retinal.
B. P700.
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Which statement about mycorrhizae is FALSE?
a. They are symbiotic associations between a fungus and a plant root. b. They increase the uptake of nutrient minerals by the plant.
c. Arbuscular mycorrhizae are extracellular. d. Endomycorrhizae are intracellular. e. Members of the Glomeromycota may be involved.
Which of the following terms best describes an organism that cannot exist in the presence of oxygen:
a. obligate aerobe b. facultative aerobe c. obligate anaerobe d. facultative anaerobe
Choose the best cause and effect sequence for the process of speciation by natural selection.
A. Variation ? Selection ? Reproductive Isolation ? Mutation ? Speciation B. Mutation ? Variation ? Selection ? Reproductive Isolation? Speciation C. Variation ? Reproductive Isolation ? Speciation ? Mutation ? Selection D. Speciation ? Reproductive Isolation ? Selection ? Mutation ? Variation E. Selection ? Speciation ? Reproductive Isolation ? Variation ? Mutation
Why does urine frequently have an acidic pH?
A. The kidneys filter and excrete H+ from the blood. B. The kidneys absorb H+ ions and excrete bicarbonate ions. C. The kidneys produce H+ in the process of filtering the blood. D. The blood has an acidic pH and the kidneys produce urine similar to the pH of the blood. E. There is a high concentration of hydrochloric acid (HCl) in the urine, making it highly acidic.