Which branch of this phylogenetic tree identifies the common ancestor of all modern organisms?

a. A
b. B
c. C
d. D
e. E


A

Biology & Microbiology

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Only antigen-presenting cells

A. produce antibodies. B. activate cytotoxic T cells. C. produce MHC class I molecules. D. produce MHC class II molecules.

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Which of the following pairs is correctly matched?

a. middle lamella?cellulose b. integrins?receptors c. primary cell wall?pectin d. fibronectins?wood e. secondary cell wall?glycoproteins

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You place equal numbers of dark and light varieties of feeder crickets into a terrarium containing a species of lizard

After two days, you notice that the dark variety of the crickets was less common than the light variety. What process is taking place on a small scale within the terrarium? Design an experiment in which you would try to determine if color or taste is the primary factor responsible for the selective feeding of the lizards. What will be an ideal response?

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Reye's syndrome involves

A. aspirin use. B. children, adolescents, and young adults. C. fatty degeneration of liver, brain, kidney. D. a febrile viral illness such as influenza or chickenpox. E. All of the choices are correct.

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