Baleen plates are comprised of:
a. keratin
b. calcium.
c. hemoglobin.
d. myoglobin.
a
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Which of the following statements is false?
A. The cells of the epiblast and hypoblast differentiate into the three germ layers. B. The inner cell mass of the blastocyst forms the embryo. C. The outer layer of cells of the blastocyst forms the placenta. D. The placenta is composed of both maternal and embryonic cells. E. None of the answer options is false.
A high concentration of H+ in the thylakoid compartment provides potential energy for the ____ by ____
a. breakdown of water; oxidation b. production of ATP; ATP synthases c. reduction of NADP+; an electron transfer chain d. production of sugars; the light-independent reactions e. production of O2; photolysis
Intracytoplasmic sperm injection is one technology for correcting which fertility issue?
a. A woman cannot produce viable eggs. b. A man makes sperm, but does not ejaculate properly or does not ejaculate enough sperm to allow fertilization. c. A woman has normal eggs but they cannot be fertilized. d. A man has non-viable sperm. e. A woman can produce eggs and they can go through fertilization, but none of the eggs can implant properly.
Parietal cells secrete:a
chyme. b. pepsin. c. pepsinogen d. HCl and instrinsic factor. e. mucus.