Which of the following is true of the myelin sheath?
a. It is produced by glial cells
b. It increases the speed of signal conduction along the axon
c. It saves energy
d. All of the above
Answer: d. All of the above
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Why was it important to infiltrate the leaf disks with liquid before performing this assay?
What will be an ideal response?
At the beginning of prophase I there are ____
strands of DNA in a developing human sperm cell.
a. 23 b. 92 c. 46 d. half as many (as compared to somatic cell) e. twice as many (as compared to mature sperm)
Which one of the following is TRUE regarding erythropoietin?
A) It is secreted by the liver in response to rising blood pH. B) It causes the bladder to store increased amounts of urine. C) It is part of a positive feedback loop used to control the amount of hydrogen ion secreted by the kidneys. D) It stimulates the production of red blood cells in the bone marrow. E) It is secreted in response to rising blood oxygen levels.
Why is widespread resistance to tuberculosis (TB) not likely to evolve any time soon?
A) Only a small percentage of people who are nonresistant to the bacterium will become infected and die from TB, so the variant will stay in the population. B) TB is highly fatal, so those who are nonresistant will die quickly. C) Humans are no longer evolving, so the population cannot develop widespread resistance. D) It would be too expensive to genetically engineer people to give them the resistance gene.