5) The compound that most often acts as a second messenger is A) cholesterol. B) phosphodiesterase. C) cyclic AMP. D) COMT. E) CRH. 6) The specific effect of a water-soluble hormone on a target cell depends on the A) particular gene that is activated. B) type of adenylate cyclase present. C) source of the phosphate for the phosphorylation reaction. D) extent to which the hormone can diffuse into the target cell. E) specific protein kinase activated. 7) When a hormone that uses a second messenger binds to a target cell, the next thing that happens is that A) phosphodiesterase is activated. B) a protein kinase is activated. C) a gene is activated in the nucleus. D) adenylate cyclase is activated by a G protein. E) voltage-regulated ion channels open in the plasma membrane. 8) Steroids include the following EXCEPT A) cortisone. B) aldosterone. C) estrogen. D) insulin. E) testosterone. 9) Amine hormones include the following: A) epinephrine. B) thyroxin. C) dopamine. D) All of the answers are correct.
Added by Holly M.
Close
Step 1
Step 1: The question asks for the compound that most often acts as a second messenger. Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 61 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Sri K.
QUESTION 28 Which of these correctly describes the role of inositol triphosphate in hormone action? A. It activates adenylate cyclase. B. It stimulates the release of Ca2+ from the endoplasmic reticulum. C. It activates protein kinase. D. All of these are correct. QUESTION 29 Which of the following is an example of a permissive effect of a hormone? A. The effect of insulin on glucose uptake by cells. B. the effect of thyroid hormone on growth. C. The effect of sex hormone on secretion of growth hormone. D. A and C E. All of the above. QUESTION 30 The receptors for steroid hormones are located A. On the extracellular side of the plasma membrane. B. On the intracellular side of the plasma membrane. C. free in the cytosol. D. Within the nucleus. E. On the surface of the nucleus.
Marlyn J.
An inhibitor of adenylyl cyclase activity would have which of the following effects? (Choose all that apply) a. Block the response of epinephrine in skeletal muscle cells b. Decrease the amount of cAMP in the cytoplasm c. Block the activation of G proteins in response to epinephrine binding to its receptor d. Prolong the effect of epinephrine by maintaining elevated cAMP levels in the cytoplasm e. Block the activation of protein kinase A in response to epinephrine 2. In general, a signal transmitted via phosphorylation of a series of proteins a. Most likely causes a shape change in each protein, thereby changing its function. b. Requires binding of a hormone to a cytosolic receptor. c. Cannot occur in yeast because they lack protein phosphatases. d. Requires phosphatase activity. e. Allows target cells to change their shape and therefore their activity. 3. At the molecular level, a receptor protein in a membrane binding to a chemical signal is most similar to a. The active site of an allosteric enzyme in the cytoplasm that binds to a specific substrate. b. RNA specifying the amino acids in a polypeptide. c. A particular metabolic pathway operating within a specific organelle. d. An enzyme with an optimum pH and temperature for activity. e. Genes making up a chromosome. 4. Testosterone and other steroid hormones typically alter cellular function by a. Binding to and activating gated ion-channels. b. Binding to a cell surface receptor that is then internalized by receptor-mediated endocytosis. c. Binding to an intracellular receptor that functions as a transcriptional regulator to alter gene expression. d. Binding to an intracellular receptor that inhibits adenylyl cyclase, thus decreasing cyclic AMP concentrations. e. Binding to and activating a kinase that initiates a phosphorylation cascade within the cell.
Adi S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD