Q: Which equation best represents the amplification of a steroid hormone signal inside a cell?

$$\text{Hormone} + \text{Receptor} \rightarrow \text{Hormone-Receptor Complex} \rightarrow \text{DNA Binding} \rightarrow \text{mRNA Transcription} \rightarrow \text{Protein Synthesis}$$

Question 1

Which of the following best describes the primary function of the endocrine system in animals?

Accepted Answer

To secrete hormones that regulate body functions and respond to environmental changes.

Question 2

Which hormone is released by the adrenal gland in response to short-term stress, and what is its primary effect?

Accepted Answer

Epinephrine; triggers the fight-or-flight response.

Question 3

Hashimoto's disease is an autoimmune disorder affecting which gland, and what is the main consequence?

Accepted Answer

Thyroid gland; results in hypothyroidism and slowed metabolism.

Question 4

Which of the following hormones is a steroid and acts by binding to receptors inside the target cell?

Accepted Answer

Cortisol

Question 5

A hormone that is lipid insoluble will most likely bind to receptors located where?

Accepted Answer

On the surface of the target cell membrane

Question 6

Which pathway describes a scenario where a neural signal stimulates endocrine cells to release hormones, which then act on effector cells?

Accepted Answer

Neuroendocrine-to-endocrine pathway

Question 7

What is the effect of antidiuretic hormone (ADH) on the kidneys during dehydration?

Accepted Answer

ADH increases the permeability of the collecting ducts to water, promoting water reabsorption.

Question 8

Which hormone is responsible for increasing blood glucose levels during fasting?

Accepted Answer

Glucagon

Question 9

In insects, what determines whether a surge of ecdysone triggers molting or metamorphosis?

Accepted Answer

The concentration of juvenile hormone (JH)

Question 10

Which of the following is an example of an endocrine disruptor and its effect?

Accepted Answer

Bisphenol A (BPA); causes abnormal development of brain and reproductive tissue.

Question 11

Which equation best represents the amplification of a steroid hormone signal inside a cell?

Accepted Answer

$$	ext{Hormone} + 	ext{Receptor} ightarrow 	ext{Hormone-Receptor Complex} ightarrow 	ext{DNA Binding} ightarrow 	ext{mRNA Transcription} ightarrow 	ext{Protein Synthesis}$$

Question 12

Which hormone is released in response to low blood oxygen levels and what is its effect?

Accepted Answer

Erythropoietin (EPO); stimulates red blood cell production.

Question 13

Which of the following best explains negative feedback regulation in hormone production?

Accepted Answer

A hormone inhibits further release of itself by acting on the hypothalamus or pituitary.

Question 14

Which hormone is secreted by the pineal gland and regulates sleep-wake cycles?

Accepted Answer

Melatonin

Question 15

What is the primary effect of aldosterone on the kidneys?

Accepted Answer

Increases reabsorption of sodium ions in the distal tubules.

Question 16

Which hormone acts as both a neurotransmitter and a hormone, and is involved in learning, memory, and the fight-or-flight response?

Accepted Answer

Epinephrine

Question 17

Which of the following is NOT a major category of chemical signals in animals?

Accepted Answer

Exocrine signals

Question 18

Which hormone is released by the anterior pituitary and stimulates the thyroid gland to secrete thyroid hormones?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 19

A patient with Cushing’s disease is unable to suppress hormone production with cortisol. What is the likely consequence?

Accepted Answer

Constant stress response and depletion of protein supplies.

Chemical Signals in Animals: Hormones and the Endocrine System

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