Which hominid species provides us with the oldest indisputable evidence of bipedalism?
a. Paranthropus
b. Australopithecus afarensis
c. Ardipithecus ramidus
d. Homo erectus
e. Sahelanthropus tchadensis
b
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In any experiment, changes to the dependent variable based on the manipulations of the independent variable are
measured. When determining the action spectrum of a given plant, what is the independent variable and what is the dependent variable?
a. independent = absorption of light; dependent = wavelength b. independent = wavelength; dependent = absorption of light c. independent = rate of O2 release in photosynthesis; dependent = absorption of light d. independent = wavelength; dependent = rate of O2 release in photosynthesis e. independent = rate of O2 release in photosynthesis; dependent = wavelength
Most males born with an extra Y chromosome
A) die shortly before or after birth. B) are violent and anti-social. C) are tall but are otherwise normal. D) are phenotypically female.
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.
What causes the rhythmic change in cyclin concentration in the cell cycle?
A) The cascade of increased production once the protein is phosphorylated by Cdk B) An increase in production of a Cdk once the restriction point is passed C) Its destruction by an enzyme phosphorylated by the cyclin-Cdk complex D) The binding of PDGF to receptors on the cell surface E) The changing ratio of cytoplasm to genome