What is the immediate effect of ligand binding to a G protein-coupled receptor?
A. the activation of an effector protein
B. the release of the alpha subunit of the G
protein
C. a conformational change in the
cytoplasmic domain of the receptor
D. an exchange of GTP in place of GDP on
the alpha subunit of the G protein
C
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The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. xylem B. vascular C. dermal D. ground E. phloem
The neural circuit that allows a male stickleback fish to orient and behave aggressively towards an inanimate object with a red stripe is an example of a(n)
A. sign stimulus. B. fixed action pattern. C. innate releasing mechanism. D. supernormal stimulus. E. stimulus-response chain. 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 behavior in stickleback fish? 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? Reflection 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?
Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, Taxol must affect
A) the formation of the mitotic spindle. B) anaphase. C) formation of the centrioles. D) chromatid assembly. E) the S phase of the cell cycle.
Patients suffering from familial adenomatous polyposis coli have typically been found to have _________, which is the site of the _________.
a) a small chromosome 5 deletion, APC oncogene b) a small chromosome 5 duplication, APC tumor-suppressor gene c) a small chromosome 5 deletion, APC tumor-suppressor gene d) a small chromosome 15 deletion, RP tumor-suppressor gene e) a small chromosome 6 deletion, APC tumor-suppressor gene