The urinary bladder is useful because it
A. transports urine to the outside of the body.
B. helps with defecation.
C. filters wastes and recycles nutrients back into the bloodstream.
D. is a place where white cells attack bacteria.
E. stores urine to prevent constant urination.
Answer: E
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Recombination frequency is used to measure the distance between genes located on nonhomologous chromosomes
A. true B. false
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.
Approximately how many neurons comprise the human brain?
a. 1,000 b. 50,000 c. 100,000 d. 75,000,000 e. 86,000,000,000
Since viruses have no active methods of entering plant cells, they must rely upon mechanically caused wounds, vegetative propagation of plants, grafting, seed, pollen, and being carried on the mouth parts of chewing insects. Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts. What would prevent viruses from easily entering plant cells?
a. The cell wall on the virus b. The plasma membrane on the plant c. The cell wall on the plant d. The plasma membrane on the virus e. The protein coat on the virus