Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 45, Problem 7TYU
The relationship between the insect hormones ecdysteroid and PTTH is an example of
(A) an interaction of the endocrine and nervous systems.
(B) homeostasis achieved by positive feedback.
(C) homeostasis maintained by antagonistic hormones.
(D) competitive inhibition of a hormone receptor.
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Which of the following statements about endocrine signalling hormones is TRUE?
a) They are only soluble in lipids.
b) In vertebrates, they are only transported through the blood circulatory system.
c) They include a group of chemicals known as pheromones.
d) Each hormone can react with only one specific receptor type.
e) They are also involved in synaptic signalling.
1) Gross Anatomy and Basic Function of the Endocrine Glands
a)Both the endocrine and nervous systems are major regulating systems of the body; however, the nervous system has been compared to a text message, and the endocrine system to mailing a letter. Briefly explain this comparison.
b) Chemically, hormones belong chiefly to two molecular groups, the___ and the___
c) If hormones travel in the bloodstream, why don't all tissues respond to all hormones?
Which of the following is not an accuratestatement?(A) Hormones are chemical messengers that travelto target cells through the circulatory system.(B) Hormones often regulate homeostasisthrough antagonistic functions.(C) Hormones of the same chemical class usually have thesame function.(D) Hormones are often regulated through feedback loops
Chapter 45 Solutions
Campbell Biology
Ch. 45.1 - How do response mechanisms in target cells differ...Ch. 45.1 - What type of gland would you expect to secrete...Ch. 45.1 - WHAT IF? Predict what would happen if you...Ch. 45.2 - What are the roles of oxytocin and prolactin in...Ch. 45.2 - How do the two fused glands of the pituitary gland...Ch. 45.2 - WHAT IF? 2192 Propose an explanation for why...Ch. 45.2 - what if? Lab tests of two patients, each...Ch. 45.3 - If a hormone pathway produces a transient response...Ch. 45.3 - Prob. 2CCCh. 45.3 - Prob. 3CC
Ch. 45 - MAKE CONNECTIONS What forms of signaling activate...Ch. 45 - Which major endocrine organs described in Figure...Ch. 45 - Prob. 45.3CRCh. 45 - Prob. 1TYUCh. 45 - Prob. 2TYUCh. 45 - Growth factors are local regulators that (A) are...Ch. 45 - Prob. 4TYUCh. 45 - Prob. 5TYUCh. 45 - Which of the following is the most likely...Ch. 45 - The relationship between the insect hormones...Ch. 45 - DRAW IT In mammals, milk production by mammary...Ch. 45 - Prob. 9TYUCh. 45 - Prob. 10TYUCh. 45 - Level 3: Synthesis/Evaluation 11. WRITE ABOUT A...Ch. 45 - Prob. 12TYU
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- Which of the following observations can be explained by the properties of hormone receptors? a) A certain tissue can react to more than one hormone b) A certain hormone affects only a specific tissue, not all tissues c) Some tissues react very quickly to a certain hormone, other tissues take many hours to react to the same hormonearrow_forwardWhat do steroid and peptide hormones typically have in common? (A) their solubility in cell membranes (B) their requirement for travel through the bloodstream (C) the location of their receptors (D) their reliance on signal transduction in the cellarrow_forwardVirtually all of the protein or amino acid-based hormones exert their effects through an intracellular O a) ions O b) deactivators c) receptors O d) second messengers Ston sharing Hidearrow_forward
- A new hormone is discovered. Analysis suggests that it is synthesized on demand and has a long half-life in the wwww www. bloodstream. It seems to activate gene transcription in its target cells, though no cell surface receptors can be identified. Which type of hormone is this most likely to be? A) Steroid hormone B) Catecholamine C) Thyroid hormone D) Peptide hormonearrow_forwardWhich of the following is not a true statement? A.) steroid and thyroid hormone signaling would be impaired if the plasma level of carrier proteins is not optimal. B.) Steroid and thyroid hormone-receptor complexes form dimers when they bind to the hormone-response elements on DNA C.) Epinephrine uses the adenylate cyclase and the phospholipase C second messenger systems D.) signaling by a peptide hormone would be impaired if a second messenger system is not functional in the target cell E.) signaling by a steroid hormone would be hindered if the adenylated cyclase second messenger system is not functional in the target cell.arrow_forwardIdentify molecule (1) in the pathway of hormonal regulation illustrated below: (A) ion channel (B) G protein-coupled receptor (C) tyrosine kinase receptor (D) cytoplasmic/nuclear receptorarrow_forward
- Steroid hormones ... a) ... transmits its effects mainly by binding to membrane receptors. b) ... are water soluble. c) ... conveys its effects mainly through so-called second messengers. d) ... is transported in the blood by means of carrier protein.arrow_forwardWhich of the following is a true statement? A.) the hormone FSH requires a second messenger system to elicit a cellular response B.) prohormones are modified before they become active C.) the combined effects of two hormones would be greater than their individual effects if they synergize by additivity D.) a hormone can influence its own action on the target cell through priming E.) all of the abovearrow_forwardA steroid hormone approaches its target cell. Which of the following happens first? a)The hormone enters the nucleus. b)The hormone passes through the cell membrane. c)The hormone and its receptor bind to the cell's DNA. d) The hormone and its receptor enter the cell's nucleus.arrow_forward
- 1. Consider the endocrine system and hormones. a) What are the three general chemical classes of hormone? b) List the THREE physiological functions of the thyroid hormones. c) How are thyroid hormones transported in the bloodstream? Why? Do the hormones enter the target cell directly? Describe the sequence of events when thyroid hormones bind to their receptors.arrow_forwardWhich of these assertions about hormones is not accurate? Which of these assertions about hormones is not accurate? A.)Hormones produced by the hypothalamus are considered neurohormones. B.) Cortisol is released in response to the release of ACTH from the pituitary. C.) Hormonal changes during puberty and pregnancy are forms of endocrine disruption. D.) Growth and metamorphosis are controlled by hormones.arrow_forwardWhich of the following types of molecules can be a hormone? a) Phospholipids b) Fatty acid derivatives c) Proteins d) Nucleic acid derivatives e) Peptidesarrow_forward
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