Question 1

Circle the isoprene units present in menthol below.

Accepted Answer

The answer of Circle the isoprene units present in menthol...

Question 2

Most hormones are

Accepted Answer

A) phosphoglycerides. 
B) terpenes. 
C) squalenes. 
D) prostaglandins. 
E) steroids. 
A) phosphoglycerides. 
B) terpenes. 
C) squalenes. 
D) prostaglandins. 
E) steroids. E

Question 3

Squalene is a

Accepted Answer

A) monoterpene. 
B) sesquiterpene. 
C) diterpene. 
D) triterpene. 
E) carotenoid. 
A) monoterpene. 
B) sesquiterpene. 
C) diterpene. 
D) triterpene. 
E) carotenoid. D

Question 4

Which of the following statements is true for both cholesterol and vitamin A?

Accepted Answer

A) Both are vitamins. 
B) Both are proteins. 
C) Both are lipids. 
D) Both are steroids. 
E) Both are fatty acids. 
A) Both are vitamins. 
B) Both are proteins. 
C) Both are lipids. 
D) Both are steroids. 
E) Both are fatty acids.

Question 5

Identify the compound that would be formed from the hydrogenation of linolenic acid.

Accepted Answer

A) palmitic acid 
B) lauric acid 
C) stearic acid 
D) myristic acid 
E) linoleic acid 
A) palmitic acid 
B) lauric acid 
C) stearic acid 
D) myristic acid 
E) linoleic acid

Question 6

What is the precursor of bile acids?

Accepted Answer

A) phosphoglyceride 
B) acetyl CoA 
C) squalene 
D) prostaglandin 
E) cholesterol 
A) phosphoglyceride 
B) acetyl CoA 
C) squalene 
D) prostaglandin 
E) cholesterol

Question 7

Propose a mechanism for the reaction,of dimethylallyl pyrophosphate with isopentenyl pyrophosphate to form geranyl pyrophosphate.

Accepted Answer

The answer of Propose a mechanism for the reaction,of dimethylallyl...

Question 8

Which of the following fatty acids cannot be synthesized by mammals but must be included in the diet because it is needed to synthesize arachidonic acid which in turn will synthesize prostaglandins?

Accepted Answer

A) lauric acid 
B) palmitic acid 
C) arachidic acid 
D) linoleic acid 
E) oleic acid 
A) lauric acid 
B) palmitic acid 
C) arachidic acid 
D) linoleic acid 
E) oleic acid

Question 9

The five-carbon compound used for the biosynthesis of terpenes is called isopentenyl pyrophosphate.Which of the following is the structure of isopentenyl pyrophosphate?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 10

In nature,biosynthesis of cholesterol starts from

Accepted Answer

A) phosphoglyceride. 
B) amino acids. 
C) squalene. 
D) prostaglandin. 
E) steroid 
A) phosphoglyceride. 
B) amino acids. 
C) squalene. 
D) prostaglandin. 
E) steroid

Question 11

The C:H ratio present in most terpenes is

Accepted Answer

A) 1:2 
B) 2:3 
C) 1:3 
D) 3:8 
E) 5:8 
A) 1:2 
B) 2:3 
C) 1:3 
D) 3:8 
E) 5:8

Question 12

Palmitic acid (hexadecanoic acid)has a melting point of 63°C.Palmitoleic acid (9-hexadecenoic acid)has a melting point of 32°C.Explain this difference in melting points.

Accepted Answer

Palmitoleic acid,an unsaturated fat,has

Question 13

Which of the following is involved in the biosynthesis of vasoconstrictor,thromboxane?

Accepted Answer

A) phosphoglycerides 
B) sphingosine 
C) squalene 
D) PGH2 
E) cholesterol 
A) phosphoglycerides 
B) sphingosine 
C) squalene 
D) PGH2 
E) cholesterol

Question 14

Which of the following statements is not true about fatty acids?

Accepted Answer

A) Fatty acids are carboxylic acids with long hydrocarbon side chains. 
B) The double bonds in unsaturated fatty acids are always conjugated. 
C) Most naturally occurring fatty acids contain even numbers of carbons and are unbranched. 
D) Fatty acids can be saturated or unsaturated. 
E) Physical properties of fatty acids depend on the length of the hydrocarbon chain and the degree of unsaturation. 
A) Fatty acids are carboxylic acids with long hydrocarbon side chains. 
B) The double bonds in unsaturated fatty acids are always conjugated. 
C) Most naturally occurring fatty acids contain even numbers of carbons and are unbranched. 
D) Fatty acids can be saturated or unsaturated. 
E) Physical properties of fatty acids depend on the length of the hydrocarbon chain and the degree of unsaturation.

Question 15

How many isoprene units are in a sesquiterpene?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 16

Which of the following terms best describes the compound below?

Accepted Answer

A) a steroid 
B) an unsaturated triglycaride 
C) a soap 
D) a complex lipid 
E) a terpene 
A) a steroid 
B) an unsaturated triglycaride 
C) a soap 
D) a complex lipid 
E) a terpene

Question 17

Which of the following is not an intermediate in the biosynthesis of isopentenyl pyrophosphate?

Accepted Answer

A) hydroxymethylglutaryl-CoA 
B) mevalonylphosphate 
C) acetoacetyl-CoA 
D) dimethylallyl phosphate 
E) mevalonic acid 
A) hydroxymethylglutaryl-CoA 
B) mevalonylphosphate 
C) acetoacetyl-CoA 
D) dimethylallyl phosphate 
E) mevalonic acid

Question 18

Which of the following best explains why the melting points of saturated fats increase with increasing molecular weight?

Accepted Answer

A) decreased polarity 
B) decreased hydrogen bonding 
C) increased hydrogen bonding 
D) decreased intermolecular van der Waal's interactions 
E) increased intermolecular van der Waal's interactions 
A) decreased polarity 
B) decreased hydrogen bonding 
C) increased hydrogen bonding 
D) decreased intermolecular van der Waal's interactions 
E) increased intermolecular van der Waal's interactions

Question 19

What is the most abundant steroid in our body?

Accepted Answer

A) cholesterol 
B) aldosterone 
C) hydrocortisone 
D) estradiol 
E) prostaglandin 
A) cholesterol 
B) aldosterone 
C) hydrocortisone 
D) estradiol 
E) prostaglandin

Question 20

Biosynthesis of terpenes start from

Accepted Answer

A) phosphoglyceride. 
B) acetyl CoA. 
C) squalene. 
D) prostaglandin. 
E) cholesterol. 
A) phosphoglyceride. 
B) acetyl CoA. 
C) squalene. 
D) prostaglandin. 
E) cholesterol.

Exam 25: The Organic Chemistry of Lipids

Circle the isoprene units present in menthol below.

Most hormones are

Squalene is a

Which of the following statements is true for both cholesterol and vitamin A?

Identify the compound that would be formed from the hydrogenation of linolenic acid.

What is the precursor of bile acids?

Propose a mechanism for the reaction,of dimethylallyl pyrophosphate with isopentenyl pyrophosphate to form geranyl pyrophosphate.

Which of the following fatty acids cannot be synthesized by mammals but must be included in the diet because it is needed to synthesize arachidonic acid which in turn will synthesize prostaglandins?

The five-carbon compound used for the biosynthesis of terpenes is called isopentenyl pyrophosphate.Which of the following is the structure of isopentenyl pyrophosphate?

In nature,biosynthesis of cholesterol starts from

The C:H ratio present in most terpenes is

Palmitic acid (hexadecanoic acid)has a melting point of 63°C.Palmitoleic acid (9-hexadecenoic acid)has a melting point of 32°C.Explain this difference in melting points.

Which of the following is involved in the biosynthesis of vasoconstrictor,thromboxane?

Which of the following statements is not true about fatty acids?

How many isoprene units are in a sesquiterpene?

Which of the following terms best describes the compound below?

Which of the following is not an intermediate in the biosynthesis of isopentenyl pyrophosphate?

Which of the following best explains why the melting points of saturated fats increase with increasing molecular weight?

What is the most abundant steroid in our body?

Biosynthesis of terpenes start from

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

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