If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative.
B. more negative.
C. No change would be observed.
A. less negative.
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Your friend examines an ivy vine growing on the side of a campus building and says, “Look – some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!” You respond,
A. “I think you’re right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology.” B. “No, those branches have just undergone phase change. Now they’re in the adult form, and have become competent to respond to flowering signals.” C. “I think you’re right. Maybe the embryonic flower (emf) gene is being overexpressed, and that’s causing flowers to form.” D. “No, those morphological changes are just evidence that this plant’s environment has changed during its lifetime.” 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 flowers? 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?
After birth, which hormone causes the uterus to "shrink" and also causes the mother's breast tissue to contract forcing
milk into the ducts? a. estrogen b. prolactin c. progesterone d. oxytocin e. HCG
What is the primary original source of genetic variation in a population?
A) mutation B) genetic drift C) blending inheritance D) cloning
When full, the innermost electron shell of argon contains ________ electrons, and the outermost shell contains ________ electrons
A) 2; 2 B) 2; 8 C) 4; 8 D) 8; 8