The Ames test demonstrates that a chemical is
A. carcinogenic.
B. carcinogenic in Salmonella.
C. mutagenic in Salmonella.
D. carcinogenic in humans.
E. mutagenic in humans.
Answer: C
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Mitochondrial disorders are probably very rare because
A) people have many mitochondria, so the healthy ones can substitute for the affected ones. B) the oocytes with harmful mitochondrial mutations do not have sufficient energy to survive. C) they are difficult to diagnose because most physicians have forgotten what mitochondria are. D) they are not inherited from the father.
The G2 checkpoint is used to determine which of the following?
a. if DNA replication has finished b. if the chromosomes have lined up at the metaphase plate c. if sister chromatids are attached to spindle microtubules properly d. if the chromosomes have finished condensing
Which factor in an experiment can be manipulated?
A) bias B) control C) placebo D) variable
Which of the following form tubes and are alive when mature?
A) parenchyma cells B) collenchyma cells C) water-conducting cells D) food-conducting cells