The most common electron donor among hyperthermophilic Archaea is
A) Fe+3.
B) H2.
C) SO4.
D) So.
Answer: B
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In the mechanism of action of a proton pump, the role of ATP is to:
a. cause a proton to bind to a carbohydrate. b. cause a cell to take up protons by endocytosis. c. cause a cell to release protons by exocytosis. d. transfer protons to the inside of a cell. e. transfer protons to the outside of a cell.
Which of the following is true of ribosomes?
A) All prokaryotic ribosomes are 70S and eukaryotic cytoplasmic ribosomes are 80S B) Bacterial ribosomes are 70S, whereas archaeal and eukaryotic cytoplasmic ribosomes are 80S. C) Organelle ribosomes and prokaryotic ribosomes are 70S, whereas eukaryotic cytoplasmic ribosomes are 80S. D) Prokaryotic ribosomes are 80S, but eukaryotic cytoplasmic ribosomes are variable in size.
A couple is having difficulty conceiving a child, and they decide to see a fertility specialist. Which two organ systems will the specialist examine in this couple?
A. reproductive and nervous systems B. reproductive and urinary systems C. reproductive and endocrine systems D. endocrine and urinary systems
Which one of the following diseases of the gastrointestinal system is transmitted by the respiratory route?
A) staphylococcal enterotoxicosis B) mumps C) Vibrio gastroenteritis D) bacillary dysentery E) traveler's diarrhea