Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
expand_more
expand_more
format_list_bulleted
Question
Chapter 3, Problem 2Q
Summary Introduction
To review:
The evidence shown in the table that will prove the hypothesis that A2, A3, B23, A19, and B24 amino acids play an important role in the activity of insulin binding.
.
Introduction:
Insulin is a 51-amino acid hormone that is required by the vertebrates for the regulation of blood glucose levels and affects lipid or protein
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What does this important observation imply about the relation between the amino acid sequence of insulin and its three-dimensional structure?
What peptides are expected to be produced when the A chain of bovine
insulin (Figure 5.16) is cleaved by (a) chymotrypsin, or (b) trypsin, or (c)
carboxypeptidase A?
HbA1c is used to monitor blood glucose levels because hemoglobin is the only protein in blood that is covalently modified by glucose.
True
False
Insulin Glargine is a long-acting form of insulin that is synthesized with several D-amino acids that slow its proteolytic degradation and extend the half-life of the insulin Glargine molecule.
True
False
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- By what the two polypeptides of human insulin are linked together?arrow_forwardDespite the fact that many peptides have critical physiological functions(e.g., as hormones, neurotransmitters, antibacterial toxins), they are not considered to be ideal as drugs. The following questions illustrate some of the issues that limit the use of peptides as therapeutics.(a) Insulin is a peptide therapeutic used to manage Type 1 diabetes, whichaffects more than 20 million people worldwide according to the International Diabetes Federation. A significant limitation to the broad distribution and use of insulin to treat Type 1 diabetes is the fact that it must be administered by injection rather than orally. Why is insulin administered by injection and not orally?(b) Many of the D-amino acids found in nature have been discovered inbacterially produced peptides that have antibiotic properties. Bacteriasecrete these peptides into their environments to kill competitor bacteriaand thereby gain a selective advantage. Given your answer to part (a) ofthis question, what potential…arrow_forwardSuppose that, through genetic manipulations, a chimeric receptor is produced that consists of the extracellular domain of the insulin receptor and the transmembrane and intracellular domains of the EGF receptor. Cells expressing this receptor are exposed to insulin, and the level of phosphorylation of the chimeric receptor is examined. What would you expect to observe and why? What would you expect to observe if these cells were exposed to EGF?arrow_forward
- One such laboratory study investigated the binding of a hormone to three different receptor proteins in the cell membrane. The data collected are shown in the table below: 1) Provide a brief explanation as to why ligand binding to proteins must be a reversible process. 2) Calculate the dissociation constant (Kd) for the hormone binding to each of the three proteins. 3) Which of the proteins demonstrate the tightest/strongest binding of the hormone? Which demonstrates the least tight binding of the hormone? What is the basis for your answer?arrow_forwardHow many high-phosphoryltransferpotential molecules are required to synthesize phosphatidylethanolamine from ethanolamine and diacylglycerol? Assume that the ethanolamine is the activated component.arrow_forward64 An investigator is studying the mechanism of action of an insulin-sensitizing drug. The addition of the drug to cultured mouse hepatocytes is observed, and results show increased phosphorylation and inhibition of acetyl-CoA carboxylase Which of the following processes is most likely inhibited by this action of the drug? A) Fatty acid oxidation B) Fatty acid synthesis C) Glycogen synthesis D) Glycolysis E) Protein synthesisarrow_forward
- If both cysteine residues on the B chain of insulin were changes to alanine residues, how would it affect the quaternary structure of insulin?arrow_forwardAssume that the binding of one molecule of epinephrine to a seven-transmembrane helix (7TM) receptor (also called the G protein-coupled receptor, or GPCR) results in the activation of 290 G, subunits. In addition, suppose that each activated adenylyl cyclase catalyzes the conversion of 40 ATP molecules to CAMP per second. Assume that each G protein activates a single unique adenylyl cyclase. Calculate the number of moles of CAMP that are produced per second. Enter your answer to two significant figures. moles produced: mol CAMP/sarrow_forwardInositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG) are second messenger molecules derived from the cleavage of phosphatidylinositol 4,5-bisphosphate [PI(4,5) P2] by activated phospholipase C. Describe the role of IP3 in causing a rise in cytosolic Ca2+ concentration. How do cells restore resting levels of cytosolic Ca2+? What is the principal function of DAG?arrow_forward
- Bodybuilders use a variety of anabolic substances to gain mass. Two such compounds are insulin and trenbolone. Insulin has significant anabolic and anti-catabolic properties and impacts the metabolism of various macromolecules, not just that of carbohydrates. Trenbolone binds the androgen receptor with an affinity five times higher than that of testosterone and is popular for its fat-burning and anabolic properties. H. Trenbolone C18H2202 Insulin C257H383NosO77S6 How do the different targets, mechanisms of action and durations of each drug ultimately lead to the same desired effect (increase in lean body mass)?arrow_forwardGlycogen synthase in the liver is a target for phosphorylation by two protein kinases. What are these two protein kinases and how are they independently regulated by glucagon and insulin to regulate glycogen biosynthesis?arrow_forwardNovolog differs from "normal" insulin in that: Select one: a. An aspartic acid has been substituted for proline at B28 b. The proline at B28 and the lysine at B29 have been reversed c. A glycine has been substituten in at A21, and two new arginines have been added as B31 and B32 d. A "C-peptide" chain has been added e. The usual insulin molecule has been combined with zinc isophanearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
What is Metabolism?; Author: Stated Clearly;https://www.youtube.com/watch?v=nRq6N5NGD1U;License: Standard youtube license