Platelet-derived growth factor (PDGF) is a signaling molecule that functions in which of the following types of cell signaling?

A. juxtacrine
B. paracrine
C. autocrine
D. endocrine
E. All of these choices are correct.


B

Biology & Microbiology

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Caffeine from the coffee plant is stored in

a. central vacuoles. b. chloroplasts. c. chromoplasts. d. leucoplasts.

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RNA can be used as a template for the

production of DNA through the action of a. DNA polymerase. b. RNA polymerase. c. reverse transcriptase. d. ligase. e. restriction endonuclease

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Name the two main clades of Rhizaria, then list one way of distinguishing one of those clades from the

other. What will be an ideal response?

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Which of the following is regulated by the kidneys?

A. blood pressure B. plasma sodium levels C. blood volume D. blood pH E. All of the choices are correct.

Biology & Microbiology