The extracellular matrix (ECM) affects a cell that it surrounds in which ways? (Select all correct choices.)
A. The ECM affects the shape that the cell
takes, depending on the structure and
composition of the extracellular matrix.
B. The ECM affects the genes that the cell
expresses, depending on the types of fibrous
proteins in the extracellular matrix.
C. The ECM affects the size that the cell
grows to, depending on the polysaccharides
in the extracellular matrix.
D. The ECM has no effect on the cells that it
surrounds.
E. All of these choices are correct.
A,B
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As you examine a soil sample under your microscope, you note the presence of tiny, wormlike organisms. You immediately suspect that these creatures are nematodes. The presence of which characteristics would support your hypothesis? Check all that apply.
_____ longitudinal but not circular muscles. _____ separate male and female individuals. _____ shedding of the integument. _____ a tough, collagen-based cuticle. _____ abundant flame cells,
In nematodes that are anatomical males, what specialized structures allow for mating and internal fertilization with an anatomical female?
a. renette cells b. pharyngeal nerve ring c. copulatory spicules d. syncytium
DNA and RNA are similar in that both
a. contain the same sugar. b. are double-stranded molecules. c. contain nitrogenous bases. d. are in the form of a double-helix. e. are very long molecules.
The plant hormone that triggers the withering of petals and stamens and promotes fruit ripening is
A. abscisic acid. B. ethylene. C. jasmonic acid. D. cytokinins. E. gibberellins.