Paraquat is an herbicide that blocks the transfer of electrons from PSII. Mechanistically, paraquat is effective because it __________
A. prevents the reduction of NADPH
B. prevents the formation of reactive oxygen
species
C. increases the formation of reactive oxygen
species
D. absorbs light energy that cannot then be
used for photosynthesis
E. increases cyclic electron transport, which
does not produce NADPH
C
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Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
Restriction enzymes are obtained from ________
A) archaea B) eukaryotes C) viruses D) bacteria
A student is observing microorganisms in a sample of pond water. One organism of interest has an obvious nucleus, small oval structures containing a green pigment, and does not appear to be motile. In which of the following groups would this microbe most likely be classified?
A. Eukaryotes (Protozoa) B. Eukaryotes (Fungi) C. Archaea D. Eukaryotes (Algae) E. Bacteria
All are true regarding red blood cells except ____?
a. Carry oxygen b. no nucleus c. No DNA d. Type of connective tissue e. all are correct