In Down syndrome, the Dart gene causes mental impairment by increasing the levels of pyrimidines in the blood
a. true
b. false
Ans: b. false
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In a pedigree chart, a male who does NOT
demonstrate the trait being studied is represented by
a. a darkened square. b. a darkened diamond. c. a clear circle. d. a clear square. e. a darkened circle.
Which statement is NOT generally characteristic of parasites?
a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. Plants as well as animals can be parasites.
In ________ mimicry, two or more unrelated but protected species resemble one another, thus achieving a kind of group defense.
A. Batesian B. disruptive C. Müllerian D. cooperative
Which of the following cells have reduced or very little active telomerase activity?
A) most normal somatic cells B) most normal germ cells C) most cancer cells