Cows can derive nutrients from cellulose because A) they convert cellulose into
ID: 83405 • Letter: C
Question
Cows can derive nutrients from cellulose because A) they convert cellulose into starch, which is easily broken down in the intestinal tract. B) they produce the enzymes that break down cellulose. C) they chew their food so thoroughly that cellulose fibers are broken down. D) their intestinal tract contains cellulose-hydrolyzing microorganisms. A Scientist suspects that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of months. Which of the following substances could be examined for radioactivity to test the hypothesis? A) the cholesterol in the cell membranes of organisms living in the ecosystem B) the hair produced by humans living in the ecosystem C) the cell walls of plants growing in the ecosystem D)the sugars produced during photosynthesis by plants growing in the ecosystem Proteins cannot be denatured by A) freezing. B) heat C) changes in salt concentration. D) changes in pH.Explanation / Answer
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