What is the smallest number of ultracentrifugation steps needed to separate nuclei from ribosomes in a cellular lysate?
a. Two
b. One
c. Four
d. Seven
Answer: b. One
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________ causes microtubules to form tight bundles in nerve cells.
A) Dynein B) Actin C) Tau D) Kinesis E) Tubulin
Which of the following is not an accurate comparison of human and insect respiratory
systems?
a. The insect tracheal system provides a large surface, while the lungs have only a small surface-to-volume ratio. b. Oxygen is transported via the circulatory system in humans, but the tracheal system in insects is separate from body fluids. c. Only humans can increase airflow using ventilation. d. Both gas exchange systems consist of a system of tubules to transport gases.
The brain stem includes the __________ and __________, which control reflexes involved in breathing and other
essential tasks. Fill in the blank(s) with the appropriate word(s).
What is the term for a single main root that is adapted for storage and which typically grows downward and fairly deep?
a. a rhizome b. a tuber c. a taproot d. a fibrous root