Question 1

Match the description with the type of receptor model.
-G-protein

Accepted Answer

A)  nuclear receptor model
B)  membrane-bound receptor modelC) A) and B)
D) undefined

Question 2

Which pattern of hormone secretion,often observed in steroid reproductive hormones,will fluctuate over a monthly cycle?

Accepted Answer

A)  acute hormone secretion
B)  episodic hormone secretion
C)  long-term hormone secretion
D)  chronic hormone secretionE) B) and C)
F) A) and D)

Question 3

Match the description with the type of receptor model.
-receptor molecule interacts with DNA

Accepted Answer

A)  nuclear receptor model
B)  membrane-bound receptor modelC) A) and B)
D) undefined

Question 4

How do most water-soluble hormones travel in the bloodstream?

Accepted Answer

A)  attached to proteins
B)  attached to carbohydrates
C)  attached to amino acids
D)  as free hormonesE) C) and D)
F) A) and B) D

Question 5

Parathyroid hormone is released when blood calcium levels decrease.This is an example of control by __________ stimuli.

Accepted Answer

A)  hormonal
B)  neural
C)  humoral
D)  visceralE) All of the above
F) None of the above

Question 6

Most hormones are regulated by

Accepted Answer

A)  negative-feedback mechanisms.
B)  neural-feedback mechanisms.
C)  positive-feedback mechanisms.
D)  hormonal-feedback mechanisms.E) All of the above
F) A) and B) A

Question 7

The role of cAMP when it acts as an intracellular mediator in cells is to

Accepted Answer

A)  bind to and activate protein kinase.
B)  activate genes in the nucleus to produce mRNA.
C)  directly activate structural enzymes in the cytoplasm of the target cell.
D)  catalyze a cascade reaction that ultimately activates genes on the DNA.
E)  control levels of calcium in the cell.F) A) and C)
G) A) and B)

Question 8

Once a lipid-soluble hormone is conjugated in the liver

Accepted Answer

A)  its half-life is increased.
B)  it can be more quickly eliminated from the body.
C)  it can be stored for later use.
D)  it is actively transported into cells.
E)  it is more slowly eliminated from the body.F) C) and E)
G) A) and E)

Question 9

Consider the following events in the nuclear receptor model: (1) Hormone receptor complex binds to DNA.
(2) Messenger RNA directs synthesis of specific proteins.
(3) Hormone binds to receptors in the nucleus (sometimes in the cytoplasm) 
(4) Messenger RNA synthesis is activated.
(5) Synthesized proteins produce the response of the cell.
Which of these events occurs in the nucleus?

Accepted Answer

A)  1,3,5
B)  1,3,4
C)  1,2,3
D)  3,4,5
E)  All events occur in the nucleus.F) A) and B)
G) B) and C)

Question 10

Which of the following statements regarding hormone transport and distribution is FALSE?

Accepted Answer

A)  Only free hormones can diffuse through capillary walls and bind to target tissues.
B)  Hormones can be transported free in the plasma or bound to plasma proteins.
C)  Plasma protein concentration has no influence on free hormone concentration.
D)  Hormones bind only to certain types of plasma proteins.
E)  All of the statements are true.F) A) and B)
G) A) and C)

Question 11

Match the chemical signal with the appropriate description.
-neurotransmitter

Accepted Answer

A)  chemicals produced by neurons that function as hormones
B)  chemicals that act locally on nearby cells
C)  chemical secreted by presynaptic terminal
D)  influences same cell type from which it is secreted
E)  chemical secreted into blood by specialized cells; travels some distance to target tissuesF) A) and E)
G) None of the above

Question 12

What type of chemical messenger will act locally on nearby cells?

Accepted Answer

A)  paracrine
B)  neurotransmitter
C)  autocrine
D)  endocrineE) All of the above
F) B) and C)

Question 13

Members of which group of hormones are made from cholesterol?

Accepted Answer

A)  amino acid derivatives
B)  peptides
C)  proteins
D)  steroidsE) None of the above
F) A) and B)

Question 14

What do all hormones have in common?

Accepted Answer

A)  They are made from amino acids.
B)  They are bound to transport molecules in the blood.
C)  They bind to and interact with a receptor on or in the target cell.
D)  They use the second messenger mechanism to control the target cell.
E)  They are all lipid-soluble.F) D) and E)
G) None of the above

Question 15

Which of the following is a regulatory protein associated with membrane-bound receptor molecules?

Accepted Answer

A)  ATP
B)  calcium
C)  M protein
D)  G protein
E)  DNAF) B) and D)
G) A) and B)

Question 16

The endocrine system

Accepted Answer

A)  releases neurotransmitters into ducts.
B)  secretes chemicals that reach their targets through the bloodstream.
C)  communicates via frequency-modulated signals.
D)  contains organs called exocrine glands.
E)  is isolated from the nervous system.F) A) and E)
G) A) and D)

Question 17

When a hormone binds to a membrane-bound receptor,

Accepted Answer

A)  membrane channels are destroyed.
B)  cyclic GMP might be produced to act as an intracellular mediator.
C)  the nucleus is phosphorylated to prevent G-protein activation.
D)  messenger RNA is formed.
E)  cellular DNA is altered.F) A) and D)
G) C) and D)

Question 18

Hormone receptor molecules may be ____ in order to change the target cell's sensitivity to a given hormone.

Accepted Answer

A)  increased in number
B)  decreased in number
C)  chemically altered
D)  moved
E)  increased in number,decreased in number and chemically alteredF) C) and D)
G) A) and C)

Question 19

Increasing levels of thyroid hormones decrease TSH levels.This is an example of _______ feedback.

Accepted Answer

negative

Question 20

Receptors for most water-soluble hormones are located

Accepted Answer

A)  in the cytoplasm of their target cells.
B)  on the plasma membrane of their target cells.
C)  in the lysosomes of their target cells.
D)  on the nuclear membrane of their target cells.
E)  on the endoplasmic reticulum of their target cells.F) B) and E)
G) A) and B)

Exam 17: Functional Organization of the Endocrine System

Match the description with the type of receptor model. -G-protein

Correct Answer
verified

Which pattern of hormone secretion,often observed in steroid reproductive hormones,will fluctuate over a monthly cycle?

Correct Answer
verified

Match the description with the type of receptor model. -receptor molecule interacts with DNA

Correct Answer
verified

How do most water-soluble hormones travel in the bloodstream?

Correct Answer
verified
D

Parathyroid hormone is released when blood calcium levels decrease.This is an example of control by __________ stimuli.

Correct Answer
verified

Most hormones are regulated by

Correct Answer
verified
A

The role of cAMP when it acts as an intracellular mediator in cells is to

Correct Answer
verified

Once a lipid-soluble hormone is conjugated in the liver

Correct Answer
verified

Correct Answer
verified

Which of the following statements regarding hormone transport and distribution is FALSE?

Correct Answer
verified

Match the chemical signal with the appropriate description. -neurotransmitter

Correct Answer
verified

What type of chemical messenger will act locally on nearby cells?

Correct Answer
verified

Members of which group of hormones are made from cholesterol?

Correct Answer
verified

What do all hormones have in common?

Correct Answer
verified

Which of the following is a regulatory protein associated with membrane-bound receptor molecules?

Correct Answer
verified

The endocrine system

Correct Answer
verified

When a hormone binds to a membrane-bound receptor,

Correct Answer
verified

Hormone receptor molecules may be ____ in order to change the target cell's sensitivity to a given hormone.

Correct Answer
verified

Increasing levels of thyroid hormones decrease TSH levels.This is an example of _______ feedback.

Correct Answer
verified
negative

Receptors for most water-soluble hormones are located

Correct Answer
verified

Exam 17: Functional Organization of the Endocrine System

Match the description with the type of receptor model. -G-protein

Correct AnswerverifiedShow Answer

Which pattern of hormone secretion,often observed in steroid reproductive hormones,will fluctuate over a monthly cycle?

Correct AnswerverifiedShow Answer

Match the description with the type of receptor model. -receptor molecule interacts with DNA

Correct AnswerverifiedShow Answer

How do most water-soluble hormones travel in the bloodstream?

Correct AnswerverifiedD

Parathyroid hormone is released when blood calcium levels decrease.This is an example of control by __________ stimuli.

Correct AnswerverifiedShow Answer

Most hormones are regulated by

Correct AnswerverifiedA

The role of cAMP when it acts as an intracellular mediator in cells is to

Correct AnswerverifiedShow Answer

Once a lipid-soluble hormone is conjugated in the liver

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements regarding hormone transport and distribution is FALSE?

Correct AnswerverifiedShow Answer

Match the chemical signal with the appropriate description. -neurotransmitter

Correct AnswerverifiedShow Answer

What type of chemical messenger will act locally on nearby cells?

Correct AnswerverifiedShow Answer

Members of which group of hormones are made from cholesterol?

Correct AnswerverifiedShow Answer

What do all hormones have in common?

Correct AnswerverifiedShow Answer

Which of the following is a regulatory protein associated with membrane-bound receptor molecules?

Correct AnswerverifiedShow Answer

The endocrine system

Correct AnswerverifiedShow Answer

When a hormone binds to a membrane-bound receptor,

Correct AnswerverifiedShow Answer

Hormone receptor molecules may be ____ in order to change the target cell's sensitivity to a given hormone.

Correct AnswerverifiedShow Answer

Increasing levels of thyroid hormones decrease TSH levels.This is an example of _______ feedback.

Correct Answerverifiednegative

Receptors for most water-soluble hormones are located

Correct AnswerverifiedShow Answer

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D

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A

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negative

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