A eukaryotic cell G2-M checkpoint assesses the status of
A) DNA replication.
B) chromosome attachment to kinetochore microtubules.
C) nutrient abundance.
D) mitotic cyclin degradation.
E) the presence of growth factors.
Answer: A
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Caenorhabditis elegans is an organism with exactly 959 somatic cells. This organism is a(n)
A. fruit fly. B. earthworm. C. nematode. D. angiosperm. E. fungus.
In the 1960s, evolutionary biologists identified protein polymorphisms using ____, which allowed them to infer how
much genetic variation exists within populations.
a. genome sequencing b. gel electrophoresis c. artificial selection d. polymerase chain reactions e. DNA microarrays
One reason that atrazine, an herbicide in use for more than 40 years, is an environmental problem is that it ____
a. raises the level of air pollution b. poses a substantial contribution to greenhouse gases c. disrupts the stratospheric ozone level d. is responsible for the extinction of bee colonies e. is an endocrine disrupter and can reduce reproductive capacity in aquatic animals
Which gland is the remnant of the "third eye"?
a. pineal b. pituitary c. thyroid d. parathyroid e. thymus