What is the significance of the conversion of pyruvate to lactate during fermentation?
A) Pyruvate becomes available to enter mitochondrial matrix reactions.
B) ATP is produced at a higher rate.
C) The citric acid cycle is initiated.
D) The oxidation of pyruvate becomes possible.
E) NAD+ is regenerated for use in glycolysis.
E
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As trees get larger and the number of leaves increase, transpiration rates rise and demand for water increases. How do plant tissues meet this demand for water?
A. Cells of the xylem continue to divide and produce more cells that transport water. B. Vascular cambium continues to divide, and cells of its inner surface differentiate to form additional secondary xylem cells. C. Cells of secondary phloem adjacent to the vascular cambium differentiate into xylem cells. D. Cells present in the pith closest to the xylem differentiate into xylem cells.
At which point on the phylogeny shown did the amnion first appear?
A. C B. A C. B D. D E. E
In Linnaeus's system of classification, how many taxonomic categories were there?
a. one b. three c. five d. seven
The primary structure of a protein is composed of the sequence of amino acids in that protein
Indicate whether the statement is true or false