The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following
A) mitosis in her ovary
B) metaphase I of one meiotic event
C) telophase II of one meiotic event
D) telophase I of one meiotic event
E) either anaphase I or II
Answer: E
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Cell signaling can be classified into
a. three distinct types based on the distance over which the signaling molecules act b. two distinct types based on the distance over which the signaling molecules act c. three distinct types based on the signaling molecules d. none of the above
Repetition maximum is the determinant of intensity of exercise in weight training.
a. true b. false
A 45-year-old man living in the western United States begins experiencing headache, fever, and body aches, which he attributes to the flu. His symptoms, however, become worse, and he later develops kidney disease and acute respiratory failure. He is most likely infected with which vi-rus?
a. Rabies virus b. Adenovirus c. Norovirus d. Hantavirus
A virus reproduces by
A. laying eggs in a host cell. B. taking control of a host cell and directing it to produce viral components. C. the exchange of gametes. D. binary fission.