In a population, some individuals are chosen as mates more frequently than others. This statement represents
A. sexual selection.
B. artificial selection.
C. penetrance.
D. morphological preference.
A. sexual selection.
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Breathing is usually regulated by
A. erythropoietin levels in the blood. B. the concentration of red blood cells. C. hemoglobin levels in the blood. D. CO2 concentration and pH sensors. E. the lungs and larynx.
A eukaryotic gene that is regulated by three activator proteins is said to be under
A. triplet regulation. B. individual control. C. self-regulation. D. combinatorial control. E. elastic control.
If a gallstone were to block the bile duct, which type of food would become more difficult to digest?
A) protein B) sugar C) fat D) starch
Which of the following clusters of terms accurately describes DNA as it is generally viewed to exist in prokaryotes and eukaryotes?
A) double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C + T) = variable B) double-stranded, parallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0 C) single-stranded, antiparallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0 D) double-stranded, parallel, (A + T)/C + G) = variable, (A + G)/(C + T) = 1.0 E) double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C+ T) = 1.0