Question 1

Kinks are formed in hydrocarbon chains that

Accepted Answer

A)  Bind proline 
B)  Have a trans double bond in the hydrocarbon chain 
C)  Have a cis double bond in the hydrocarb on chain 
D)  Are saturated 
E)  Are esterified to cholesterol 
A)  Bind proline 
B)  Have a trans double bond in the hydrocarbon chain 
C)  Have a cis double bond in the hydrocarb on chain 
D)  Are saturated 
E)  Are esterified to cholesterol C

Question 2

Surface tension is best described as

Accepted Answer

A)  The surface energy per unit area 
B)  The surface energy per unit length 
C)  The force or tension per unit area 
D)  The force per unit volume 
E)  The surface energy per unit volume 
A)  The surface energy per unit area 
B)  The surface energy per unit length 
C)  The force or tension per unit area 
D)  The force per unit volume 
E)  The surface energy per unit volume A

Question 3

The thickness of biological membranes is about

Accepted Answer

A)  10 µm 
B)  1 µm 
C)  100 nm 
D)  10 nm 
E)  1 nm 
A)  10 µm 
B)  1 µm 
C)  100 nm 
D)  10 nm 
E)  1 nm D

Question 4

The major hydrophilic part o f a phosphatidylinositol is its

Accepted Answer

A)  Glycerol 
B)  Phosphate 
C)  Cis Fatty a cid 
D)  Inositol 
E)  Trans fatty acid 
A)  Glycerol 
B)  Phosphate 
C)  Cis Fatty a cid 
D)  Inositol 
E)  Trans fatty acid

Question 5

Integral proteins

Accepted Answer

A)  Have irreducible functions 
B)  Are loosely bound to membranes 
C)  Are constituents of ribosomes 
D)  Are tightly bound to membranes 
E)  Require high salt for removal from membranes 
A)  Have irreducible functions 
B)  Are loosely bound to membranes 
C)  Are constituents of ribosomes 
D)  Are tightly bound to membranes 
E)  Require high salt for removal from membranes

Question 6

The signal recognition peptide

Accepted Answer

A)  Binds to the signal sequence and to the SRP receptor 
B)  Binds to the signal sequence and to the translocon 
C)  Binds to the SRP and to the translocon 
D)  Binds to the signal sequence inside the ER lumen 
E)  Helps fold up proteins inside the ER 
A)  Binds to the signal sequence and to the SRP receptor 
B)  Binds to the signal sequence and to the translocon 
C)  Binds to the SRP and to the translocon 
D)  Binds to the signal sequence inside the ER lumen 
E)  Helps fold up proteins inside the ER

Question 7

Molecules having a lipophilic part spatially separated from a hydrophilic part are called

Accepted Answer

A)  Ambivalent 
B)  Amphipathic 
C)  Zwitterionic 
D)  Integral 
E)  Peripheral 
A)  Ambivalent 
B)  Amphipathic 
C)  Zwitterionic 
D)  Integral 
E)  Peripheral

Question 8

In phospholipids, the phosphate is generally bonded between

Accepted Answer

A)  Fatty acid and glycerol 
B)  Glycerol and hydrophilic group such as choline 
C)  Fatty acid and serine 
D)  Glycerol and glucose 
E)  Fatty acids and glucose 
A)  Fatty acid and glycerol 
B)  Glycerol and hydrophilic group such as choline 
C)  Fatty acid and serine 
D)  Glycerol and glucose 
E)  Fatty acids and glucose

Question 9

The major hydrophobic part of a phospholipid is its

Accepted Answer

A)  Glycerol 
B)  Ph osp hate 
C)  Fatty acid 
D)  Inositol 
E)  Choline 
A)  Glycerol 
B)  Ph osp hate 
C)  Fatty acid 
D)  Inositol 
E)  Choline

Question 10

Amphipathic molecules

Accepted Answer

A)  Prefer organic solvents such as chloroform or CCl4 as a solvent 
B)  Prefer water as a solvent 
C)  Have spatially separated lipophilic and hydrophilic regions 
D)  Have spatially separated positive and negative charges on their surface 
E)  Are soluble in neither water nor lipid solvents 
A)  Prefer organic solvents such as chloroform or CCl4 as a solvent 
B)  Prefer water as a solvent 
C)  Have spatially separated lipophilic and hydrophilic regions 
D)  Have spatially separated positive and negative charges on their surface 
E)  Are soluble in neither water nor lipid solvents

Question 11

Which of the following is NOT a polar group used in phospholipids?

Accepted Answer

A)  Serine 
B)  Inositol 
C)  Choline 
D)  Ethanolamine 
E)  Alanine 
A)  Serine 
B)  Inositol 
C)  Choline 
D)  Ethanolamine 
E)  Alanine

Question 12

Cardiolipin consists of

Accepted Answer

A)  Sphingomyelin with attached carbohydrate molecules 
B)  Two sphingosine molecules linked by a glycerol 
C)  Two phosphatidyl choline molecules linked by a phosphate 
D)  Two phosphatidic acid molecules linked by a glycerol 
E)  Two ceramide molecules linked by a phosphate 
A)  Sphingomyelin with attached carbohydrate molecules 
B)  Two sphingosine molecules linked by a glycerol 
C)  Two phosphatidyl choline molecules linked by a phosphate 
D)  Two phosphatidic acid molecules linked by a glycerol 
E)  Two ceramide molecules linked by a phosphate

Question 13

Which of the following is not a constituent of a phospholipid?

Accepted Answer

A)  Fatty acid 
B)  Glycerol 
C)  Phosphate 
D)  Choline 
E)  Cholesterol 
A)  Fatty acid 
B)  Glycerol 
C)  Phosphate 
D)  Choline 
E)  Cholesterol

Question 14

The origin of the surface tension of water at the water-air interface is

Accepted Answer

A)  Air pressure pushing on the water surface 
B)  Water molecules attracting other water molecules more than the air attracts them 
C)  W ater in the bulk phase being at a higher energy than water at the surface 
D)  Attractive forces of air molecules that tend to exclude the water 
E)  The hydrophilic nature of air molecules 
A)  Air pressure pushing on the water surface 
B)  Water molecules attracting other water molecules more than the air attracts them 
C)  W ater in the bulk phase being at a higher energy than water at the surface 
D)  Attractive forces of air molecules that tend to exclude the water 
E)  The hydrophilic nature of air molecules

Question 15

Motion of lipids in a biological membrane is

Accepted Answer

A)  Slow in all directions 
B)  Slow across the membrane, but fast in the plane of the membrane 
C)  Rapid in all directions 
D)  Fast across the mem brane, but slow in the plane of the mem brane 
E)  Re stricted except in lipid rafts 
A)  Slow in all directions 
B)  Slow across the membrane, but fast in the plane of the membrane 
C)  Rapid in all directions 
D)  Fast across the mem brane, but slow in the plane of the mem brane 
E)  Re stricted except in lipid rafts

Question 16

The main ingredient of the lipid bilayer in most biologcal membranes is

Accepted Answer

A)  Phospholipids 
B)  Cholesterol 
C)  Free fatty acids 
D)  Triglycerides 
E)  Cardiolipin 
A)  Phospholipids 
B)  Cholesterol 
C)  Free fatty acids 
D)  Triglycerides 
E)  Cardiolipin

Question 17

The first part of a secreted protein to be translated is called its

Accepted Answer

A)  Initiation sequence 
B)  Orig in 
C)  Signal sequence 
D)  Target sequence 
E)  Recognition sequence 
A)  Initiation sequence 
B)  Orig in 
C)  Signal sequence 
D)  Target sequence 
E)  Recognition sequence

Question 18

Secreted proteins cross the mem brane of the ER

Accepted Answer

A)  By diffusion 
B)  By active transport 
C)  Through a channel provided by a translocon 
D)  By osmosis 
E)  Through a channel made by the SRP 
A)  By diffusion 
B)  By active transport 
C)  Through a channel provided by a translocon 
D)  By osmosis 
E)  Through a channel made by the SRP

Question 19

The surface tension of pure water is 72 dyne cm-1. Addition of surfactant lowers the surface tension to 60 dyne cm -1. With the surfactant, the surface pressure is

Accepted Answer

A)  12 dyne cm -1 
B)  132 dyne cm -1 
C)  0.166 dyne cm -2 
D)  0.20 dyne cm -2 
E)  Cannot be determined from the information given 
A)  12 dyne cm -1 
B)  132 dyne cm -1 
C)  0.166 dyne cm -2 
D)  0.20 dyne cm -2 
E)  Cannot be determined from the information given

Question 20

Fatty acids consist of

Accepted Answer

A)  A hydrocarbon chain and an alcohol group on one end 
B)  A hydrocarbon chain and an ester bond at the far end 
C)  A hydrocarbon chain and an ether bond at the far end 
D)  A hydrocarbon chain and an carboxylic acid group at the far end 
E)  A hydrocarbon chain and an SH group at the far end 
A)  A hydrocarbon chain and an alcohol group on one end 
B)  A hydrocarbon chain and an ester bond at the far end 
C)  A hydrocarbon chain and an ether bond at the far end 
D)  A hydrocarbon chain and an carboxylic acid group at the far end 
E)  A hydrocarbon chain and an SH group at the far end

Exam 9: Biological Membranes

Kinks are formed in hydrocarbon chains that

Surface tension is best described as

The thickness of biological membranes is about

The major hydrophilic part o f a phosphatidylinositol is its

Integral proteins

The signal recognition peptide

Molecules having a lipophilic part spatially separated from a hydrophilic part are called

In phospholipids, the phosphate is generally bonded between

The major hydrophobic part of a phospholipid is its

Amphipathic molecules

Which of the following is NOT a polar group used in phospholipids?

Cardiolipin consists of

Which of the following is not a constituent of a phospholipid?

The origin of the surface tension of water at the water-air interface is

Motion of lipids in a biological membrane is

The main ingredient of the lipid bilayer in most biologcal membranes is

The first part of a secreted protein to be translated is called its

Secreted proteins cross the mem brane of the ER

The surface tension of pure water is 72 dyne cm-1. Addition of surfactant lowers the surface tension to 60 dyne cm -1. With the surfactant, the surface pressure is

Fatty acids consist of

Physical Foundations Ii: Electrical Force Potential Capacitance and Current

Chemical Foundations I: Chemical Energy and Intermolecular Forces

Chemical Foundations Ii: Concentration and Kinetics

Diffusion

Electrochemical Potential and Free Energy

Cell Structure

Dna and Protein Synthesis

Protein Structure

Passive Transport and Facilitated Diffusion

Active Transport: Pumps and Exchangers

Osmosis and Osmotic Pressure

Cell Signaling

ATP Production I: Glycolysis

Atp Production Ii: Tca Cycle and Oxidative Phosphorylation

Atp Production Iii: Fatty Acid Oxidation and Amino Acid Oxidation

Origin of the Membrane Potential

The Action Potential

Propagation of the Action Potential

Skeletal Muscle Mechanics

Contractile Mechanisms in Skeletal Muscle

Neuromuscular Junction and Ec Coupling

Muscle Energetics Fatigue and Training

Smooth Muscle

Organization of the Nervous System

Cells Synapses and Neurotransmitters

Cutaneous Sensory Systems

Spinal Reflexes

Balance and Control of Movement

the Chemical Senses

Hearing

Vision

Autonomic Nervous System

Overview of the Cv System and Blood

Plasma and Red Blood Cells

White Blood Cells and Inflammation

The Heart As a Pump

Cellular Basis of Cardiac Contractility

the Cardiac Function Curve

Vascular Function: Hemodynamics

Microcirculation and Solute Exchange

Regulation of Perfusion

Integration of Cardiac Output and Venous Return

Regulation of Arterial Pressure

Mechanics of Breathing

Lung Volumes and Airway Resistance

Gas Exchange in the Lung

Oxygen and Carbon Dioxide Transport

Acid Base Physiology I Bicarbonate Buffers and Respiratory Compensation

Control of Ventilation

Anatomy and Renal Overview

Glomerular Filtration

Tubular Reabsorption and Secretion

Concentration and Dilution of Urine

Mouth and Esophagus

The Stomach

Intestinal and Colonic Motility

Pancreatic and Biliary Secretion

Digestion and Absorption of the Macronutrients

Energy Balance and Regulation of Food Intake

The surface tension of pure water is 72 dyne cm^-1. Addition of surfactant lowers the surface tension to 60 dyne cm ^-1. With the surfactant, the surface pressure is