Which of the following is a function of the kidneys? I) elimination of urea II) reabsorption of valuable solutes III) reabsorbing water
A) I
B) II
C) III
D) all of the above
D
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Humans are capable of synthesizing 12 of the 20 naturally-occurring amino acids without having to obtain them from our diets
A. true B. false
In meiosis, how does prophase I differ from prophase II?
A) During prophase I there is one diploid cell; during prophase II there are two haploid cells. B) During prophase I chromosomes line up single file in the middle of the cell; during prophase II the chromosomes line up in double file in the middle of the cell. C) During prophase I the chromosomes coil up; the chromosomes are not coiled up during prophase II. D) In prophase I the sister chromatids are attached; in prophase II the sister chromatids are separated.
Which contains the greatest amount of potential energy?
A. C6H12O6 (glucose) B. C48H82O41 (complex carbohydrate) C. CH3CH2COOH (pyruvic acid) D. CO2 (carbon dioxide)
We know that the anthropogenic production of CO2 represents the single largest contributor to the greenhouse effect. What is another greenhouse gas that is also increasing as the result of human activities?
A) methane B) nitrogen oxides C) chlorinated hydrocarbons D) ozone E) all of the above