Four of the five choices listed below are
characteristics of ethylene. Select the exception.
a. levels increase in stressed plants
b. promotes fruit ripening
c. triggers cell division
d. is a gas
e. promotes abscission
Answer: c
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When listening to a beating heart, if a physician hears two “lub” sounds instead of one, which of the following is true?
1.The semilunar valves are not closing simultaneously. 2.The atrial blood is flowing backward, causing the extra sound. 3.The atrioventricular (AV) valves are not closing at the same time. 4.The AV and semilunar valves are not closing at the same time. 5.No such sound has ever been heard.
After completion of a genome sequencing project, the DNA sequences are analyzed to locate and identify genes in a
process called _____. a. automation b. comparative genomics c. physical mapping d. compilation e. annotation
While many body cells only replicate 40 to 60 times, cells that produce certain white blood cells may replicate many more times. It is, therefore, crucial that proofreading and repair occur so that the transfer of biological information is accurate. On the other hand, absolute accuracy in replication of biological information would cancel out mutations that are the raw material of evolution. Why is accuracy in transcription and translation less critical than accuracy in gene replication?
What will be an ideal response?
Which of the following is not true of specialized transduction?
A. The phage genome retains the full complement of phage genes. B. It is restricted to those genes on either side of an integrated prophage. C. It is carried out by temperate phage. D. All of the choices are correct.