Freshwater fish are ________ with respect to osmoregulation.
A. hypertonic regulators
B. isotonic conformers
C. hypertonic conformers
D. hypotonic conformers
E. hypotonic regulators
Answer: A
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What is released from the axon end of the nerve cell?
Reverse transcriptase catalyzes the production of _____ from ____
a. double-stranded cDNA; single-stranded mRNA b. double-stranded mRNA; single-stranded cDNA c. single-stranded cDNA; single-stranded mRNA d. single-stranded mRNA; single-stranded cDNA e. double-stranded cDNA; double-stranded mRNA
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.
Interleukins and erythropoietin are
a. growth factors. b. Cdk's. c. cyclins. d. antitumor agents. e. intracellular signaling molecules.