Which of the following is NOT TRUE concerning
photosystem I?
a. It can run independently as a cyclic pathway.
b. It runs as a cyclic pathway when too much
NADPH is produced.
c. Electrons from p700 return to p680 when it runs
as a cyclic pathway.
d. When it runs as a cyclic pathway, neither
NADP+ nor O2 is formed.
e. Its energized electrons are used to build a high
H+ concentration.
Answer: c
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Concordance refers to
A) percentage of monozygotic twin pairs in which neither express the trait. B) percentage of monozygotic twin pairs in which both express the trait. C) percentage of dizygotic twin pairs in which both express the trait. D) percentage of twin pairs in which both express a trait among pairs in which at least one twin has the trait.
In the blood clotting cascade mechanism, which specific enzyme catalyzes the conversion of fibrinogen to fibrin?
A. renin B. thrombin C. albumin D. angiotensin E. catalase
Which of the following organisms is a prokaryote?
A. algae B. archaea C. fungus D. protozoa E. both archaea and protozoa
True pili used for conjugation are only found on gram-negative bacteria.
a. true b. false