Refer to the following graph of an action potential to answer the question.

The minimum graded depolarization needed to operate the voltage-gated sodium and potassium channels is indicated by the label ________.

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#Question id: 2514

#Unit 2. Cellular Organization

In what way are intermediate filaments similar to both microtubules and microfilaments?

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#Question id: 23896

#Unit 13. Methods in Biology

Identifying and Locating Human Disease Genes

11. Huntington’s disease is an example of

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#Question id: 296

#Unit 1. Molecules and their Interaction Relevant to Biology

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.

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#Question id: 28873

#Unit 4. Cell Communication and Cell Signaling

Wnt proteins form which type of secondary structure?

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#Question id: 13164

#Unit 4. Cell Communication and Cell Signaling

Match the following.

Column I	Column II	Column III
A. G Protein–Coupled Receptors That Activate PDE	i. cAMP	a. Increase in conversion of glycogen to glucose
B. G Protein–Coupled Receptors That Activate Adenylyl Cyclase	ii. cGMP	b. Hyperpolarization or depolarization of photoreceptor membrane
C. G Protein–Coupled Receptors That inhibit Adenylyl Cyclase	iii. DAG	c. activates genes necessary for cell division
D. G Protein–Coupled Receptors That Trigger Elevations in Cytosolic and Mitochondrial Calcium		d. increase in K+ permeability hyperpolarizes the membrane

Which one of the following is correct?