How do cattle digest complex plant polysaccharides like cellulose?
A. They have specialized mammalian
enzymes to degrade the bonds of cellulose.
B. Bacterial populations in one of the four
compartments of their stomachs are able to
break the bonds between adjacent glucose
units of cellulose.
C. Mechanical forces of cud-chewing break
the cell walls of plant fibers, enabling the
cattle to extract the digestible contents of the
cells.
D. Acids produced in the stomach degrade
cellulose.
B
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ATP can be produced via the Stickland reaction by ________.
A. Clostridium B. Epulopiscium C. Bacillus D. Desulfotomaculum
The HIV genome is especially prone to mutation because
A. it is made of DNA. B. it is an emerging virus. C. it is copied by reverse transcriptase, which lacks a proofreading function D. of the many different drugs HIV patients must take.
A cell that can divide to give rise to any cell type, including those of membranes that support the developing embryo, is
A) multipotent. B) a progenitor cell. C) a differentiated cell. D) totipotent.
Of the following organs, which is NOT in the
abdominal cavity? a. stomach b. liver c. heart d. intestine e. pancreas