According to the graph in the accompanying figure, chlorophyll absorbs light most strongly in what region of the electromagnetic spectrum?
a. UV and red wavelengths
b. red and blue wavelengths
c. blue and green wavelengths
d. green and yellow wavelengths
e. UV and infrared wavelengths
b
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How might a change of one amino acid at a site, distant from the active site of an enzyme, alter an enzyme's substrate specificity?
A) by changing the enzyme's stability B) by changing the enzyme's location in the cell C) by changing the shape of an enzyme D) by changing the enzyme's pH optimum E) An amino acid change away from the active site cannot alter the enzyme's substrate specificity.
An example of purple photosynthetic bacteria's metabolic flexibility is seen in Rhodospirillum rubrum using a "decision-making" process. When oxygen is present, the bacterium uses fermentation, photoheterotrophy, or photoautotrophy but if oxygen is absent, it switches metabolic pathways to grow chemoorganotrophically.
Answer the following statement true (T) or false (F)
Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele at this locus, associated with normal hearing, is D. Dr. Smith's
parents could have which of the following genotypes? A) DD and dd B) dd and dd C) Dd and Dd D) Dd and DD
What prevents multiple sperm from fertilizing one egg?
A) atresia B) phagocytosis by accessory cells once one sperm contacts the membrane C) release of granules that harden the membrane outside of the oocyte D) egg immediately divides and becomes impervious to sperm