Over time, cytotrophoblasts ____ while syncytiotrophoblasts ____.
A. become multinucleate; degenerate
B. carry out immune modulation; become multinucleate
C. degenerate; develop into spiral arteries
D. degenerate; carry out immune modulation
E. develop into capillaries; carry out immune modulation
Answer: D. degenerate; carry out immune modulation
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Ivan Valiela's hypothesis that the growth of salt marsh grass is limited by nitrogen availability was:
a. disproved by the growth of larger and taller grass in his control (nitrogen-fertilized) plots. b. disproved by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots. c. supported by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots. d. supported by the growth of larger and taller grass in his control (nitrogen-fertilized) plots. e. unsupported by a poor experimental design.
Hemodialysis____
a. involves removing the patient's blood, cleansing it, and returning it to the body b. can be done at home by pumping dialysis solution into the abdominal cavity c. only needs to be performed once a month d. replaces a person’s blood during the filtration process e. is only required while a kidney heals itself
A kidney transplant ____ has the best chance of success
a. followed by a lifetime of dialysis b. from a deceased donor c. from a living donor d. from an animal donor e. occurring after peritoneal dialysis
Which of the following is the correct sequence of these events in the origin of life?
I. formation of protobionts II. synthesis of organic monomers III. synthesis of organic polymers IV. formation of DNA-based genetic systems a) III, II, I, IV b) I, II, III, IV c) I, III, II, IV d) IV, III, I, II e) II, III, I, IV