When does the GTP bound to -tubulin hydrolyzed to GDP and Pi?
a. During formation of the -dimer
b. During polymerization of dimers onto microtubules
c. During depolymerization of dimers from microtubules
d. Following polymerization but before depolymerization
e. Following depolymerization of dimers from microtubules
Ans: d. Following polymerization but before depolymerization
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A controlled way of asking and answering unbiased questions about the world is called a(n) ____
Whats the term for this?
Which statement is TRUE of the behavior of
chromosomes in mitosis? a. Each new cell receives half of the number of chromosomes in the original cell. b. Each new cell receives copies of all the original chromosomes. c. If the original number of chromosomes was 46, each new cell will have 23. d. The sister chromosomes are not identical due to breakages in the DNA. e. All chromosomes are duplicated except the sex chromosomes.
Refer to Figure 42-2. When an electrical impulse travels along the neuron labeled 2:
a. the hand will be extended. b. the hand will be withdrawn. c. the fingers will flex. d. the fingers will extend. e. the hand will remain stationary.
John, a Peace Corps worker in the country of Mali in Africa, was in a car accident while traveling through a rural area. He was treated at a tiny rural hospital, and due to his loss of blood, he required a transfusion. John has B- blood type and has never received a transfusion before. Which statement is correct regarding this scenario?
A. He can be given types O or B, no matter whether Rh- or Rh+. At this point in time, he does not have anti-Rh antibody. O has no antigens on the blood cells, so he is also safe to receive that type in addition to his own B type. B. The preferred blood type to give John, in addition to his own B type blood, would be AB. Both types of blood have the B antigen on the cells, so they would correspond to his own antigens. As for Rh, he can receive only Rh- blood since he would have a reaction against Rh+. C. He can be given A+ blood type in addition to B+. Rh- means that he makes no antibody to Rh. D. He can safely receive O- blood even though he makes anti-A antibodies.