Which system maintains the volume and composition of body fluids?
a. integumentary
b. immune
c. digestive
d. urinary
e. circulatory
ANSWER: d
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How do gap junctions differ from desmosomes?
a. A gap junction bridges the space between cells. b. A gap junction is a much larger space between cells. c. A gap junction provides communication between cells. d. A gap junction can control the passage of materials between cells. e. A gap junction requires the use of ATP to open and close its channels.
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.
According to the data, the crickets at 25°C have greater oxygen consumption per gram of tissue than do the crickets at 10°C. This trend in oxygen consumption is the opposite of that in the mice. The difference in trends in oxygen consumption among crickets and mice is due to their
(A) relative size (B) mode of nutrition (C) mode of internal temperature regulation (D) mode of ATP production
In a frog embryo, gastrulation _____
A) produces a blastocoel displaced into the animal hemisphere B) occurs along the primitive streak in the animal hemisphere C) proceeds by involution as cells roll over the lip of the blastopore D) occurs within the inner cell mass that is embedded in the large amount of yolk