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 29RQ
Summary Introduction
To review:
The movement of a water molecule through ahydrophobic cell membrane.
Introduction:
Water is a small polar molecule. The cell membrane is referred as plasmalemma and consists of both hydrophobic region and hydrophilic region. It controls the movement of various substances in as well as out of the cells. It is found selectively permeable in order to regulate what is entering or exiting the cell.
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Three proteins that facilitate the movement of phospholipidmolecules across a membrane are flippase, floppase, and_________________________.
Hydrophobic polypeptides that dissipate osmotic gradients by inserting themselves into a membrane to form a channel are called _____________.
Diffusion occurs because of the ________________________ of molecules.
Chapter 11 Solutions
Biochemistry: The Molecular Basis of Life
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- _____________ are molecules used in enzyme studies that resemble the structure of a substrate’s transition state.arrow_forwardThe fatty acid tails in the plasma membrane are ______________ which means they are _______________.arrow_forwardTransport of a substance across membranes that requires no direct input of energy is referred to as _____________ transport.arrow_forward
- The antifungal drug nystatin kills fungal cells in part through formation of membrane pores that cause K+ leakage. To what class of membrane-inserting molecules does nystatin belong?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_forwardSaturated fatty acids have _____________ double bonds.arrow_forward
- Question 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_forwardSAM is a donor of _____________ groups in the synthesis of some phospholipid molecules.arrow_forward_________________ is the general term for molecules that enzymes modify to produce reaction products.arrow_forward
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