Many bacterial responses are controlled by two component regulatory systems. What will happen at the high concentration of glutamine and at the low concentration of glutamine?

a) At high concentrations glutamine binds to a sensor domain of NtrB conformational change in the protein that inhibits its histidine kinase activity

b) NtrC phosphorylation takes place causes a conformational change in NtrC that unmasks the NtrC DNA-binding domain so that it can bind to the glnA enhancers

c) At the same time, the regulatory domain of NtrC blocks its DNA-binding domain from binding the glnA enhancers

d) At low concentrations of glutamine dissociates from the sensor domain in the NtrB protein, leading to activation of a histidine kinase transmitter domain

Which of the following given combination is correct?

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#Question id: 20283

#Unit 7. System Physiology – Animal

The following statements regarding to the pancreas and its function.

a. The pancreas is composed of two major types of tissues, (1) the acini, which secrete digestive juices into the duodenum, and (2) the islets of Langerhans, which secrete insulin and glucagon directly into the blood.

b. The islets contain three major types of cells, alpha, beta, and delta cells

c. The beta cells, constituting about 25 percent of all the cells of the islets, lie mainly in the middle of each islet and secrete insulin and amylin.

d. The alpha cells, about 60 percent of the total, secrete glucagon and the delta cells, about 10 percent of the total, secrete somatostatin.

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#Question id: 20284

#Unit 7. System Physiology – Animal

What is the importance of C-peptide in proinsulin?

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#Question id: 20285

#Unit 7. System Physiology – Animal

Which of the following is CORRECT?

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#Question id: 20286

#Unit 7. System Physiology – Animal

Except for that portion of the insulin that combines with receptors in the target cells, the remainder is degraded by the enzyme _____?

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#Question id: 20287

#Unit 7. System Physiology – Animal

Match the medications to their main action:

1. Thiazolidinediones	a. to control plasma glucose
2. Metformin	b. cause additional release of insulin by the pancreas
3. Sulfonylureas	c. suppress liver glucose production
4. Insulin	d. increase insulin sensitivity

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#Question id: 20288

#Unit 7. System Physiology – Animal

The effects of insulin on nutrient flow are given below:

a. Increases glycogen formation

b. Increases glycogenolysis

c. Decreases gluconeogenesis

d. Increases lipolysis

e. Increases protein synthesis

Choose the correct combination: