Define and explain the importance of the blood-brain barrier
What will be an ideal response?
ANSWER: The blood-brain barrier is a structural system of tight cellular junctions. Many substances
are prevented from passing from the blood to the neurons because of these cellular
junctions. This provides protection from microorganisms and toxins.
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Which of the following statements in TRUE?
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. B. Euchromatin, found in interphase cells, is readily visible and easily viewed. C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms. D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin. E. All choices are correct.
What does evolutionary fitness measure?
A. longevity B. relative reproductive success C. physical health D. population size
Which of the following systems is the only one to have direct interactions with the other three?
a. digestive b. urinary c. circulatory d. respiratory e. reproductive
One difference between passive and active transport through a cell membrane is that:
A) passive transport requires ATP. B) passive transport makes ATP. C) active transport requires ATP. D) active transport makes ATP.