In cells infected with simian sarcoma virus, the sis oncogene causes the cells to release increased amounts of Sis protein, which is recognized by PDGF-receptor molecules on the cells' own surface. This type of signaling loop is an example of
a) Endocrine signaling.
b) Paracrine signaling.
c) Autocrine signaling.
d) Trans-receptor signaling.
Answer: c) Autocrine signaling.
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Why are carrots said to be good for you?
A. That is just an old wive's tale. B. Beta-carotene, the orange pigment in carrots, is a precursor to Vitamin A and retinal, the cofactor in photopigments. C. Beta-carotene, the orange pigment in carrots, is necessary to form lens proteins. D. Carrots have large amounts of glutamate, a neurotransmitter that activates sensory neurons. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about carrots? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
One mechanism that some animals use to limit heat loss in cold environments is
A. vasoconstriction of veins. B. vasoconstriction of the precapillary sphincters in the skin. C. increasing cardiac output. D. vasodilation of below surface blood vessels. E. vasodilation of the near surface blood vessels.
What specifically happens when the myosin
bound ATP is hydrolyzed to ADP and Pi?
a. the myosin converts to a high energy state b. the myosin converts to a low energy state c. the energy released from ATP causes the release of calcium from endoplasmic reticula d. myosin and actin form a cross-bridge e. the sarcomere contracts
Which of the following affects the size of the clear zone in a disk diffusion test of antimicrobial susceptibility?
A. The initial concentration of the drug B. The diffusion rate of the drug C. The solubility of the drug D. All of the choices are correct.