Resistance of sickle cell disease carriers to malaria illustrates
A) genetic drift.
B) a population bottleneck.
C) balanced polymorphism.
D) a founder effect.
C) balanced polymorphism.
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The intracellular parasite Nanoarchaeum equitans has one of the smallest prokaryotic genomes. Why is the genome of N. equitans so small?
How is it possible that the genome of N. equitans contains more genes than that of Mycoplasma genitalium, which is actually 90 kbp larger? What will be an ideal response?
The first stage of photosynthesis begins with
a. hydrolysis of water. b. breakdown of ATP. c. excitation of electrons. d. phosphorylation of ADP. e. synthesis of NADPH.
The hydrogen ions released by the dissociation of carbonic acid are buffered by their
A) binding to hemoglobin. B) transport into the erythrocyte as sodium ions move out. C) binding to DNA within the nucleus. D) transport out of the erythrocyte as a sodium ion moves in. E) active transport out of the erythrocyte.
Most of the oxygen in the blood is transported by _____.
a) platelets b) serum c) plasma d) the protein hemoglobin e) leukocytes