Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 11, Problem 67TQ
Summary Introduction
To review:
The lipid composition of the cell membrane of thermophiles, and the bacteria that live at normal temperature.
Introduction:
The plasma membrane is a lipid bilayer that protects every cell. Many proteins along with carbohydrates are present in this lipid bilayer, and they can move freely. Plasma membrane acts as a semipermeable membrane, hence it prevents entry of any foreign material into the cell.
Thermophiles are the organisms that can survive in high temperature conditions, whereasorganisms that can survive in normal or temperate conditions are called mesophiles.
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Chapter 11 Solutions
Biochemistry: The Molecular Basis of Life
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- The carrier of molecules of carbon dioxide in fatty acid synthesis is _____________.arrow_forwardAll _____________ Proteins and _________ Are Asymmetrically Oriented in the Bilayerarrow_forwardHydrophobic polypeptides that dissipate osmotic gradients by inserting themselves into a membrane to form a channel are called _____________.arrow_forward
- In covalent catalysis, either nucleophilic catalysis or electrophilic catalysis occurs. Do you agree or disagree with this statement? Explain.arrow_forwardAll coenzymes are cofactors, but not all cofactors are coenzymes. Explain this statement.arrow_forwardQuestion 9 The nucleoside monophosphates are seen in metabolic pathways because their phosphoric anhydride bonds can be hydrolyzed off for energy. A) True B) Falsearrow_forward
- Hexokinase is an important enzyme in the metabolism of glucose. If theconcentration of hexokinase in our eukaryotic cell is 20 μM, how many glucose molecules are present per hexokinase molecule?arrow_forwardTransport of a substance across membranes that requires no direct input of energy is referred to as _____________ transport.arrow_forward_________________ is the general term for molecules that enzymes modify to produce reaction products.arrow_forward
- _____________ are enzymes that catalyze oxidation-reduction reactions.arrow_forwardQuestion 1: Why do we need to add concentrated H2SO4 (sulfuric acid) or HCl (hydrochloric acid) during Molisch's Test? Question 2: Why do trioses and tetroses give negative result for the Molisch's Test? Explain with the help of necessary chemical structures or minimal reaction blocks. Question 3: Why do some organic acids like citric acids, lactic acid, etc. give positive result for Molisch's Test? Question 4: Is Molisch's Test a specific test for detecting Carbohydrates? Discuss in brief with other possible test for the detection of carbohydrates. Question 5: Suppose, you are provided with samples of commercially available sugar-free carbonated soft drinks. How would you perform the Molisch's Test to verify?arrow_forwardWhen phospholipids are added to an aqueous environment (consisting mostly of water) the phospholipid molecules will spontaneously assemble into a phospholipid bilayer where the layers are held together by weak attractive forces between molecules. These structures are often seen in nature as cell and organelle membranes. _____________________________________________________________________________ 3. Which movement is more likely within a membrane, lateral movement or transverse (ie. flip-flop)? Why? 4. Which forces hold the phospholipid bilayer together?arrow_forward
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