__________ increase the free surface area of

epithelia that absorb substances. Fill in the blank(s) with the appropriate word(s).


Answer: Microvilli

Biology & Microbiology

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In mitosis, one diploid nucleus becomes

a. two haploid nuclei. b. one haploid nucleus. c. two diploid nuclei. d. four diploid nuclei. e. four haploid nuclei.

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Chemoreceptors are organized into taste buds

A) in the upper portions of nasal passages. B) on the tongue. C) that are also responsible for smell. D) with long cilia that are constantly in motion.

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The growth factor Superchick stimulates the proliferation of cultured chicken cells. The receptor that binds Superchick is a receptor tyrosine kinase (RTK), and many chicken tumor cell lines have mutations in the gene that encodes this receptor

Which of the following types of mutation would be expected to promote uncontrolled cell proliferation? (a) a mutation that prevents dimerization of the receptor (b) a mutation that destroys the kinase activity of the receptor (c) a mutation that inactivates the protein tyrosine phosphatase that normally removes the phosphates from tyrosines on the activated receptor (d) a mutation that prevents the binding of the normal extracellular signal to the receptor

Biology & Microbiology

Chagas disease involves transmission of the pathogen by the

A. tsetse fly. B. hard-bodied tick. C. Anopheles mosquito. D. reduviid, "kissing," bug. E. phlebotomine (sand) fly.

Biology & Microbiology