An example of an animal with a long digestive tract and molars with a large, ridged surface is
a. cat.
b. deer.
c. dog.
d. shark.
e. tiger.
B
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How do cells in the body of a multicellular organism communicate with each other?
a. by way of signaling molecules that interact with specific receptors b. through long projections that directly connect cells to each other c. through electrical signals passed between a cell and its external environment d. by the transport of ions between cells in different parts of the organism e. by the transport of ions in water
Which of the following layers lies next to the lumen
of the intestinal tract? a. longitudinal muscles b. circular muscles c. submucosa d. mucosa e. serosa
It is considered healthy to have high levels of high-density lipoproteins (HDL). Why is this true?
A) HDL is a form of saturated fat. B) HDL moves cholesterol to the liver for disposal. C) HDL moves cholesterol to the heart. D) HDL is important in making complete proteins.
_____ dyes have a negative charge on the chromophore and are repelled by bacterial cells.
Fill in the blank(s) with the appropriate word(s).Fill in the blank(s) with the appropriate word(s).