Which of the following does NOT occur in the first
trimester during human development?
a. formation of a heart
b. disappearance of the tail
c. formation of internal organs
d. detection of movement of the fetus
e. segmentation and development of somites
Answer: d
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Background extinction rates once eliminated seven to eight species per year
a. True b. False
The Army and the Environmental Protection Agency are decreasing the contamination at the Army's Aberdeen Proving
Grounds by ____. a. removing contaminated soil b. planting hybrid poplar trees c. chemically degrading the contaminants d. covering the contaminated soil with a sealant e. injecting the soil with clean water to dilute the contaminated groundwater
Which statement about phenotype is false?
A. The phenotype is what the environment acts on B. A behavior is a phenotype C. Phenotypes are typically affected by a single genetic locus D. The phenotype is what natural selection acts on
Which of the following produces NADPH?
A) the pentose phosphate pathway only B) the Calvin-Benson cycle only C) the Embden-Meyerhof pathway only D) both the Embden-Meyerhof and Calvin-Benson cycle pathways E) both the pentose phosphate and Entner-Doudoroff pathways