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 19RQ
Summary Introduction
To review:
The factors that influence membrane fluidity.
Introduction:
Membrane fluidity is the viscosity of the lipid bilayer thatreduces the degree of resistance of the membrane components, so, that they could move. The amount of unsaturated fatty acids present in the phospholipid molecule determines the fluidity of the membrane.
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Three proteins that facilitate the movement of phospholipidmolecules across a membrane are flippase, floppase, and_________________________.
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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?
Chapter 11 Solutions
Biochemistry: The Molecular Basis of Life
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- Transport of a substance across membranes that requires no direct input of energy is referred to as _____________ transport.arrow_forwardThe two types of membrane proteins are peripheral and _____________.arrow_forwardDiffusion occurs because of the ________________________ of molecules.arrow_forward
- _____________ are molecules used in enzyme studies that resemble the structure of a substrate’s transition state.arrow_forwardBacterial phospholipids are hydrophobic due to fatty acids, while archaeal phospholipids are hydrophobic due to ______________________________.arrow_forward__________ and_______________ are two granular organelles (enzyme complexes) that, respectively, synthesize and degrade proteins.arrow_forward
- _____________ is a form of membrane transport that requires a channel or carrier but no direct energy input.arrow_forward________________ is the name of the process by which glucose moves across a plasma membrane.arrow_forwardInactive precursor proteins with removable signal peptides are called _____________.arrow_forward
- Question 28 : In a SDS-PAGE analysis (Indicate the right answer) : A- The proteins are denatured and positively charged by the addition of SDS. B- Large proteins run faster than small proteins. C- If the pHi of a protein corresponds to the pH of the running buffer the protein becomes positively charged (+) and cannot migrate anymore into the gel. D- For reducing disulfide bridges one needs to add a reducing agent such as 2-mercaptoethanol or DTT. E- All is wrong.arrow_forwardA posttranslational modification that directs a polypeptide toa specific site is called a _____________________modification.arrow_forwardSAM is a donor of _____________ groups in the synthesis of some phospholipid molecules.arrow_forward
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