In the digestive system, some protease enzymes must be secreted as an inactive form and then activated later by proteolytic cleavage once outside of the secreting cell to prevent active proteases from damaging the secreting cells. What is the category of precursor proteins of this type?
A) ubiquitins
B) zymogens
C) glycosides
D) activins
B) zymogens
Biology & Microbiology
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What is the final electron acceptor in the electron transport chain?
a. ubiquinone b. the Q molecule c. oxygen d. cytochrome c
Biology & Microbiology
Meiosis is indicated by the letter ____
a. A b. B c. C
d. D e. E
Biology & Microbiology
NADH is formed when NAD+ accepts:a
a proton. b. a hydrogen atom. c. a pair of protons and an electron. d. a proton and a pair of electrons. e. two hydrogen atoms.
Biology & Microbiology
A 25-year-old male presented with fever, malaise, and a rash on his chest, arms, and feet. Diagnosis was based on serological testing. The patient then reported that he had an ulcer on his penis two months earlier. This disease can be treated with
A) acyclovir. B) metronidazole. C) miconazole. D) penicillin. E) surgery.
Biology & Microbiology