What is the first step of photosynthesis?
A) Calvin cycle
B) light reactions
C) citric acid cycle
D) electron transport chain
B
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During which phase of aerobic respiration is
FADH2 produced? a. glycolysis b. ethanol production c. acetyl-CoA formation d. the Krebs cycle e. glycolysis and the Krebs Cycle
In mammals, males are ________ for genes on their sex chromosomes, and females can be ________ or heterozygous for genes on their sex chromosomes.
A. hemizygous; homozygous B. homozygous; hemizygous C. heterozygous; hemizygous D. heterozygous; homozygous
Which of the following describes the mechanism by which a plant stem grows toward light?
A. The plant seeks light in order to maximize photosynthesis B. nerve like impulses stimulate contractile cells on the lighted side of the stem C. cells on the dark side of he stem elongate more than those on the lighted side D. THe plant grows into an open area where its leaves will not be shaded by competing plants E. the greater energy supply on the lighted side of the stem stimulates metabolism and growth on that side
A crucial photosynthetic gene of the cyanobacterium that gave rise to the chromatophore is called psaE. This gene is present in the nuclear genome of the cercozoan, but is not in the genome of the chromatophore. This is evidence of _____
A) reciprocal mutations in the chromatophore and nuclear genomes B) horizontal gene transfer from bacterium to eukaryotes C) genetic recombination involving a protist and an archaean D) transduction by a phage that infects both prokaryotes and eukaryotes