Cows can derive nutrients from cellulose because
A) they produce the enzymes that break down cellulose.
B) they chew their food so thoroughly that cellulose fibers are broken down.
C) their intestinal tract contains cellulose-hydrolyzing microorganisms.
D) they convert cellulose into starch, which is easily broken down in the intestinal tract.
Answer: C
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Which would most likely pass unaided through a plasma membrane?
A. Something small and polar, such as a water molecule B. Something small and nonpolar, such as nitrogen gas C. Something large, such as a glucose molecule D. Something small and charged, such as an ion
Which type of molecule organizes transmembrane proteins into lipid rafts?
a. phospholipid b. glycolipid c. cholesterol d. glycoprotein
ATP is composed of deoxyribose, adenine, and three phosphate groups.
Answer the following statement true (T) or false (F)
Which of the following statements is NOT
generally characteristic of parasites? a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. Plants as well as animals can be parasites