The p700 photosystem is designated as photosystem
“I” because it
a. absorbs light energy first.
b. absorbs more energy than photosystem II.
c. is the primary photosystem.
d. is thought to have evolved first.
e. obtains electrons before photosystem II.
Answer: d
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Which of the following statements is not true of protists?
A. Moisture is absolutely essential to their existence. B. They make up a substantial fraction of the marine plankton. C. They are not known to cause diseases of humans. D. Most are free living.
Which of the following statements about the coordination of the heartbeat is false?
A. Each heartbeat is generated by signals from the nervous system that stimulate the heart's pacemaker cells. B. Cardiac muscles are in electrical continuity, which allows for synchronous contraction of the two atria followed by synchronous contraction of the two ventricles. C. Under normal conditions, the electrical separation between the atria and ventricles prevents all four chambers from contracting synchronously. D. Following activation of the AV node, the action potential is transmitted to the base of the ventricles by a modified set of cardiac muscle fibers. E. None of the answer options is false.
When chromosomes fail to separate at either the first or second meiotic division this
A. is known as crossing over. B. results in a sperm or egg cell with an abnormal number of chromosomes. C. is known as translocation. D. results in a failure to produce gametes. E. results in arrest during meiosis.
Which of the following is not a compound?
a. H2O b. O2 c. NaCl d. CO2 e. MgCl2