In the process of cell differentiation,
a. some daughter cells usually receive varying assortments of genes.
b. different genetic instructions begin to operate in different groups of cells.
c. cells become specialized as a result of meiosis.
d. daughter cells acquire different characteristics as a result of mutations that have occurred.
e. all of these
B
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Which polysaccharide is a chain of glucose units that are modified by having nitrogen-containing groups, is the main
structural fiber in the external skeletons of arthropods, and also a structural material in the cell walls of fungi?
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
Which list represents the proposed sequence in plant evolution?
a. angiosperms >>> bryophytes >>> seedless vascular plants >>> gymnosperms b. bryophytes >>> seedless vascular plants >>> gymnosperms >>> angiosperms c. gymnosperms >>> angiosperms >>> bryophytes >>> seedless vascular plants d. seedless vascular plants >>> gymnosperms >>> bryophytes >>> angiosperms e. bryophytes >>> gymnosperms >>> angiosperms >>> seedless vascular plants
FAD becomes oxidized when it accepts hydrogen atoms and their electrons
__________________ Indicate whether the statement is true or false.
During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done?
A. To hide from the host's immune system. B. VSG genes inhibit phagocytosis. C. VSG genes activate photoheterotrophy. D. To signal endocytosis of the parasites.