Question 1

Why are membranes with unsaturated fatty acids in their components more flexible and fluid?

Accepted Answer

A) Unsaturated fatty acids pack closely together to form ordered arrays. 
B) Unsaturated fatty acids bend at the double bond,preventing close packing. 
C) Saturated fatty acids have a "kink" that produces more fluid aggregates. 
D) Unsaturated fatty acids have cis double bonds that prevent formation of a "kink." 
A) Unsaturated fatty acids pack closely together to form ordered arrays. 
B) Unsaturated fatty acids bend at the double bond,preventing close packing. 
C) Saturated fatty acids have a "kink" that produces more fluid aggregates. 
D) Unsaturated fatty acids have cis double bonds that prevent formation of a "kink."

Question 2

Which of the following is a feature of terpenes?

Accepted Answer

A) components of wool wax 
B) made up of isoprene dimers 
C) formed from 2 or more 2-methyl-1,3-butadiene molecules 
D) trimer units linked head to tail 
A) components of wool wax 
B) made up of isoprene dimers 
C) formed from 2 or more 2-methyl-1,3-butadiene molecules 
D) trimer units linked head to tail

Question 3

Why are lipids the biomolecules of choice for storage of metabolic energy?

Accepted Answer

A) They are soluble in water. 
B) They yield a large amount of energy upon oxidation. 
C) They are highly oxidized. 
D) They are easily hydrolyzed and therefore offer quick energy yield. 
A) They are soluble in water. 
B) They yield a large amount of energy upon oxidation. 
C) They are highly oxidized. 
D) They are easily hydrolyzed and therefore offer quick energy yield.

Question 4

Which of the following products are generated when triacylglycerols undergo saponification?

Accepted Answer

A) fatty acid and glycerol 
B) fatty alcohols and fatty acids 
C) salts of fatty acids and fatty alcohols 
D) salts of fatty acids and glycerol 
A) fatty acid and glycerol 
B) fatty alcohols and fatty acids 
C) salts of fatty acids and fatty alcohols 
D) salts of fatty acids and glycerol

Question 5

Which of the following does NOT contain cholesterol?

Accepted Answer

A) lipoproteins 
B) plant cell plasma membranes 
C) membranes of intracellular organelles 
D) animal cell membranes 
A) lipoproteins 
B) plant cell plasma membranes 
C) membranes of intracellular organelles 
D) animal cell membranes

Question 6

Which of the following is the reason why body fat a major storage form of energy?

Accepted Answer

A) It aggregates in a highly anhydrous form (without additional water weight). 
B) It yields about 17 kJ/g (4 cal/g)of energy. 
C) It is highly hydrated and easy to metabolize. 
D) It yields about 25 kJ/g (6 cal/g)of energy. 
A) It aggregates in a highly anhydrous form (without additional water weight). 
B) It yields about 17 kJ/g (4 cal/g)of energy. 
C) It is highly hydrated and easy to metabolize. 
D) It yields about 25 kJ/g (6 cal/g)of energy.

Question 7

Which of the following is NOT a designation for a fatty acid with 18 carbons and 1 double bond?

Accepted Answer

A) linoleic acid 
B) cis-9-octadecenoic acid 
C) oleic acid 
D) elaidic acid 
A) linoleic acid 
B) cis-9-octadecenoic acid 
C) oleic acid 
D) elaidic acid

Question 8

Which of the following would contain the largest amount of fatty acids with trans double bonds?

Accepted Answer

A) the fatty acid on carbon #1 of the glycerol of phosphatidylcholine 
B) butter 
C) canola oil 
D) a 900 gram package of cookies containing partially hydrogenated cottonseed 
A) the fatty acid on carbon #1 of the glycerol of phosphatidylcholine 
B) butter 
C) canola oil 
D) a 900 gram package of cookies containing partially hydrogenated cottonseed

Exam 8: Lipids

Why are membranes with unsaturated fatty acids in their components more flexible and fluid?

Which of the following is a feature of terpenes?

Why are lipids the biomolecules of choice for storage of metabolic energy?

Which of the following products are generated when triacylglycerols undergo saponification?

Which of the following does NOT contain cholesterol?

Which of the following is the reason why body fat a major storage form of energy?

Which of the following is NOT a designation for a fatty acid with 18 carbons and 1 double bond?

Which of the following would contain the largest amount of fatty acids with trans double bonds?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipid Biosynthesis

Membranes and Membrane Transport

The Reception and Transmission of Extracellular Information

Enzymes Kinetics and Specificity

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

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