Q: Which of the following equations best represents the signal transduction pathway for a protein hormone?

$$\text{Hormone} + \text{Receptor}_{\text{membrane}} \rightarrow \text{Second Messenger} \rightarrow \text{Cellular Response}$$

Q: A hormone is found to alter gene expression by binding to DNA in the nucleus. Which equation best represents this process?

$$\text{Hormone} + \text{Receptor}_{\text{nucleus}} \rightarrow \text{DNA Binding} \rightarrow \text{Gene Expression}$$

Q: Which of the following equations best represents the pathway for steroid hormone action?

$$\text{Steroid Hormone} + \text{Receptor}_{\text{cytoplasm}} \rightarrow \text{Receptor-Hormone Complex} \rightarrow \text{Nucleus} \rightarrow \text{Gene Expression}$$

Question 1

Which of the following best explains why the distinction between protein and steroid hormones is important for their mechanism of action?

Accepted Answer

Protein hormones act via second messengers because they cannot cross the cell membrane, while steroid hormones directly affect gene expression by entering the cell.

Question 2

A patient is given a hormone that binds to receptors inside the cell and directly influences gene transcription. Based on this mechanism, which type of hormone is most likely being administered?

Accepted Answer

Steroid hormone

Question 3

Which of the following equations best represents the signal transduction pathway for a protein hormone?

Accepted Answer

$$	ext{Hormone} + 	ext{Receptor}_{	ext{membrane}} ightarrow 	ext{Second Messenger} ightarrow 	ext{Cellular Response}$$

Question 4

Which hormone type is most likely to have a rapid effect on target cells, and why?

Accepted Answer

Protein hormones, because they activate second messenger systems that quickly alter cell function.

Question 5

A hormone is found to be hydrophilic and cannot cross the plasma membrane. Which of the following is most likely true about this hormone?

Accepted Answer

It is a protein hormone and binds to cell surface receptors.

Question 6

Which of the following best describes the mechanism of action for steroid hormones?

Accepted Answer

They bind to intracellular receptors and regulate gene expression.

Question 7

A hormone is found to alter gene expression by binding to DNA in the nucleus. Which equation best represents this process?

Accepted Answer

$$	ext{Hormone} + 	ext{Receptor}_{	ext{nucleus}} ightarrow 	ext{DNA Binding} ightarrow 	ext{Gene Expression}$$

Question 8

Which of the following is a key difference in the way protein and steroid hormones are transported in the blood?

Accepted Answer

Steroid hormones require carrier proteins due to their hydrophobic nature, while protein hormones are freely soluble in plasma.

Question 9

A patient with a mutation in their cell membrane receptors is likely to have impaired response to which type of hormone?

Accepted Answer

Protein hormones

Question 10

Which of the following scenarios best illustrates the importance of hormone type in drug design?

Accepted Answer

Designing a steroid hormone drug that must be formulated to cross the cell membrane and reach nuclear receptors.

Question 11

Which of the following is most likely to be true about the onset and duration of action for steroid hormones compared to protein hormones?

Accepted Answer

Steroid hormones have a slow onset and long duration due to their effects on gene expression.

Question 12

Which of the following equations best represents the pathway for steroid hormone action?

Accepted Answer

$$	ext{Steroid Hormone} + 	ext{Receptor}_{	ext{cytoplasm}} ightarrow 	ext{Receptor-Hormone Complex} ightarrow 	ext{Nucleus} ightarrow 	ext{Gene Expression}$$

Question 13

Which of the following is a consequence of the hydrophobic nature of steroid hormones?

Accepted Answer

They require carrier proteins for transport in the blood.

Question 14

A hormone is administered that cannot cross the cell membrane and must bind to a receptor on the cell surface. Which of the following is most likely true about its structure?

Accepted Answer

It is a protein hormone.

Question 15

Which of the following best explains why protein hormones generally have a shorter duration of action compared to steroid hormones?

Accepted Answer

Protein hormones are rapidly degraded and act through reversible second messenger systems.

Question 16

Which of the following is a real-world example illustrating the difference in action between protein and steroid hormones?

Accepted Answer

Insulin (a protein hormone) rapidly lowers blood glucose, while cortisol (a steroid hormone) slowly alters metabolism over hours.

Question 17

Which of the following is most likely to be true about the receptor location for protein hormones?

Accepted Answer

Protein hormone receptors are located on the cell membrane.

Question 18

A hormone is found to be synthesized from cholesterol. Which of the following is most likely true about its mechanism of action?

Accepted Answer

It binds to intracellular receptors and alters gene expression.

Question 19

Which of the following equations best represents the pathway for protein hormone action?

Accepted Answer

$$	ext{Protein Hormone} + 	ext{Receptor}_{	ext{membrane}} ightarrow 	ext{Second Messenger} ightarrow 	ext{Cellular Response}$$

Hormones: Protein vs. Steroid – Structure, Function, and Mechanisms

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