A hungry yeast cell lands in a vat of grape juice and begins to feast on the sugars there, producing carbon dioxide and ethanol in the process:
C6H12O6 + 2ADP + 2Pi+ H+ -> 2CO2+ 2CH3CH2OH + 2ATP + 2H2O
Unfortunately, the grape juice is
contaminated with proteases that attack some of the transport proteins in the yeast cell membrane, and the yeast cell dies. Which of the following could account for the yeast cell's demise?
(a) toxic buildup of carbon dioxide inside the cell
(b) toxic buildup of ethanol inside the cell
(c) diffusion of ATP out of the cell
(d) inability to import sugar into the cell
(d)
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Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
Which of the following is NOT an example of a good or service provided by plants that directly benefits human society?
A. discovery of new medicines B. horticultural therapy and stress relief C. dietary source of vitamins, minerals, and fiber D. source of oxygen and sink for carbon dioxide E. All of the above are benefits plants provide to human society.
TRAIT SPECIESABCDE111011211010311100410000511100611011The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, while "1" indicates the derived condition. Which trait is least informative of phylogenetic relationships within the group?
A. A B. B C. C D. D E. E
Which of the following is the stored form of carbohydrates in animals?
A. glycogen B. maltose C. galactose D. cellulose E. starch