The primitive protoprokaryote likely acquired motility before it lost the cell wall.
a. true
b. false
Ans: b. false
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Which of the following is a possible application of DNA microarrays?
A. cell-specific gene expression B. gene regulation C. elucidation of metabolic pathways D. tumor profiling E. All of the choices are correct.
Zach undergoes a sperm analysis and is upset to learn that he has oligospermia. This means that
A) he has cancer of the spermatogonia, and his sperm will never mature. B) he makes too many sperm, and they will crowd and kill each other. C) he makes too few sperm, lowering the probability of one sperm successfully reaching and fertilizing an oocyte. D) his sperm have two heads, each of which contains an entire genome of DNA, making them too heavy to swim to an oocyte.
DNA is replicated by a process called ____________________
Fill in the blank(s) with the appropriate word(s).
Which of these is the main function of the blood-brain barrier?
Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood Prevents any molecules from entering the cerebrospinal fluid from the blood Coordinates the nervous and endocrine systems by influencing the pituitary gland Filters sensory input and keeps the cerebral cortex in an alert state