Biochem_Ch. 13 - Chapter 13 Membrane Channels and Pumps...

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Chapter 13 Membrane Channels and Pumps Matching Questions Use the following to answer questions 1-10: Choose the correct answer from the list below. Not all of the answers will be used. a) aspartic acid b) gap junctions c) digitalis d) action potential e) cotransporters f) ABC proteins g) lipophilic h) acetylcholine i) ATPases j) connexin k) patch-clamp l) antiporter 1 ____________ These membrane proteins transport two species in opposite directions across the membrane. Ans: l Section: Introduction 2 ____________ This type of molecule can diffuse across a membrane without the aid of a transporter protein. Ans: g Section: 13.1 3 ____________ P-type ATPases transfer a phosphor group to this amino acid residue side chain. Ans: a Section: 13.2 4 ____________ A plant extract of steroids used to treat heart failure. Ans: c Section: 13.2 5 ____________ This family of transport proteins possesses a separate domain or cassette that specifically binds ATP. Ans: f Section: 13.3
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Chapter 13 Membrane Channels and Pumps 6 ____________ These membrane transporters couple the transport of one species to the downhill flow of another ion species. Ans: e Section: 13.3 7 ____________ This is a technique used to measure conductance across a membrane. Ans: k Section: 13.4 8 ____________ This is another name for a nerve impulse. Ans: d Section: 13.4 9 ____________ These are passages that exist between adjacent cells that allow passage of ions and small molecules. Ans: b Section: 13.5 10 ____________ Cell-to-cell junctions are composed of 12 molecules of this protein. Ans: j Section: 13.5 Fill in the Blank Questions 11 The specific transport of a species down its concentration gradient is referred to as _______________________. Ans: passive transport, or facilitated diffusion Section: Introduction, 13.1 12 Membrane pumps are energy ____________________. Ans: transducers Section: Introduction 13 In _________________ a phosphoryl group is transferred from ATP to a specific aspartate residue. Ans: P-type ATPases Section: 13.2 14 Cardiac steroids such as digitoxigenin inhibit the _______________________. Ans: Na + -K + ATPase pump Section: 13.2 15 A P-glycoprotein transporter is also referred to as MDR protein which is an acronym for _________________________. Ans: Multidrug-resistance Section: 13.2 2
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Chapter 13 Membrane Channels and Pumps 16 The lactose permease transports lactose into the cell along with a ______________. Ans: H + , proton Section: 13.3 17 The interconversion between two conformations of a transporter is sometimes referred to as __________________. Ans: eversion Section: 13.2 18 Tetrodotoxin, isolated from puffer fish, binds tightly and specifically to ___________ channels in nerve cells. Ans:
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This note was uploaded on 05/30/2011 for the course BIOCHEMIST 4033 taught by Professor Dorristerry during the Fall '10 term at Florida A&M.

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Biochem_Ch. 13 - Chapter 13 Membrane Channels and Pumps...

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