Calcium ions regulate contraction of smooth muscle cells by binding to _____
A) troponin
B) tropomyosin
C) actin
D) myosin
E) calmodulin
Answer: E
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A researcher wants to create a mouse model for a disease, to allow her team to study possible therapies. The disease is known to be caused by a small deletion that removes a certain gene. Which type of mouse would be the best choice for this purpose?
A. Knockout mouse B. Knockin mouse C. Conditional knockout mouse activated by a drug D. Mutant derived by traditional forward genetics screen E. Tissue-specific gene knockout 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 transgenic mouse technology? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Which one of the following steps occurs during the absolute refractory period?
A) The neuron cannot generate an action potential. B) Sodium channels open, releasing sodium ions into the neuron, which causes potassium channels to close. C) Sodium channels open, which causes potassium channels to open. D) A nerve impulse fails to reach threshold. E) Potassium channels open, releasing potassium ions from the neuron; sodium channels close.
In performing a Gram's staining techniques, the counterstain is
A. Methylene blue B. Crystal violet C. Safranin D. Malachite green E. Gram's iodine
The work of (Needham/Redi/Spallanzani) using infusions in sealed vials provided strong evidence that spontaneous generation does not occur
What will be an ideal response?