Question 1

Instructions: Match each of the given terms to a structure from the list below.There is only one correct structure for each term,and structures may be used more than once.

Accepted Answer

The answer of Instructions: Match each of the given terms...

Question 2

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): CH₃COCl,pyridine

Accepted Answer

The answer of Instructions: Draw the structures of the major...

Question 3

Which of the following fatty acids has the highest melting point?

Accepted Answer

Lauric acid has the highest melting point among the given options due to the presence of a longer carbon chain and higher degree of saturation, which makes the molecule more rigid and compact. Oleic acid is a monounsaturated fatty acid with a lower melting point, while linoleic and linolenic acids are polyunsaturated fatty acids with even lower melting points due to their kinked shape and low degree of compactness.

Question 4

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
grandisol

Accepted Answer

The answer of Instructions: Indicate by asterisks the stereogenic centers...

Question 5

Chemically,these are triacylglycerols,triesters of glycerol with three long-chain carboxylic acids.

Accepted Answer

Triacylglycerols are commonly known as fats and oils. They consist of three fatty acid chains esterified to a glycerol backbone, which forms a triester. Waxes typically consist of long-chain fatty acids esterified to long-chain alcohols, while fatty acids are only the individual components of triacylglycerols and other lipids. Soaps are made from the reaction of fatty acids with alkalis, and do not contain glycerol.

Question 6

Cell membranes,which form an effective barrier to the passage of ions and other components into and out of the cell,are:

Accepted Answer

Lipid bilayers are composed of phospholipids and cholesterol, which form a double layer of molecules that make up the cell membrane. This structure creates a hydrophobic barrier that prevents the entry and exit of molecules that would otherwise disrupt the stability and function of the cell. Fatty acid esters, tricacylglycerols, and micelles are not typically found in cell membranes.

Question 7

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): NaBH₄,ethanol

Accepted Answer

The answer of Instructions: Draw the structures of the major...

Question 8

When soaps disperse in water,the long hydrocarbon tails cluster together in a hydrophobic ball,while the ionic heads on the surface of the cluster stick out into the water.These spherical clusters are called:

Accepted Answer

When soaps disperse in water, they form spherical clusters called micelles, where the hydrophobic tails of the soap molecules cluster together in the center of the sphere, while the ionic heads protrude outwards into the surrounding water. This allows the soap to dissolve and remove oily or greasy substances from surfaces. Fatty acid esters and triacylglycerols are not involved in micelle formation, and lipid bilayers are formed by different types of molecules.

Question 9

Which of the following fatty acids has the highest melting point?

Accepted Answer

Stearic acid has the highest melting point of these options because it has the longest carbon chain and is the most saturated, meaning it has the most van der Waals interactions between molecules, requiring more heat energy to break the bonds and melt.

Question 10

Which of the following is not true about cholesterol?

Accepted Answer

Cholesterol is a steroid and a precursor for other steroids, and it is produced from lanosterol. However, the rigid structure of cholesterol's four fused rings does not allow for ring-flips, which distinguishes it from other steroid molecules.

Question 11

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
a-santonin

Accepted Answer

The answer of Instructions: Indicate by asterisks the stereogenic centers...

Question 12

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below.  
androsterone
Draw major product(s):

Accepted Answer

The answer of Instructions: Draw the structures of the major...

Question 13

Which of the following processes is used to harden an oil to give a fat?

Accepted Answer

Hydrogenation is the process of adding hydrogen to unsaturated fatty acids in order to saturate them and create a more solid, stable fat. This process is commonly used in the food industry to create margarine, shortening, and other solid fats. It involves heating the oil and exposing it to hydrogen gas, which then chemically bonds with the unsaturated bonds in the oil to create a more saturated fat.

Question 14

Progesterone and progestin are examples of:

Accepted Answer

The answer of Progesterone and progestin are examples of:
...

Question 15

Which of the following would be expected to be found in higher concentration in butter versus olive oil?

Accepted Answer

Option A represents a saturated fatty acid, which is typically found in higher concentrations in butter compared to olive oil, which is richer in unsaturated fats.

Question 16

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
abietic acid

Accepted Answer

The answer of Instructions: Indicate by asterisks the stereogenic centers...

Question 17

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
lineatin

Accepted Answer

The answer of Instructions: Indicate by asterisks the stereogenic centers...

Question 18

Which of the following would function in a regulatory capacity?

Accepted Answer

Aldosterone is a hormone produced by the adrenal glands that functions in regulating electrolyte balance and blood pressure in the body. It acts in a regulatory capacity in the renin-angiotensin-aldosterone system. Androsterone, norethindrone, and estradiol are hormones that have other functions, such as androgenic or estrogenic effects.

Question 19

The major lipid components of cell membranes are:

Accepted Answer

Phosphoglycerides are the major lipid components of cell membranes, comprising about 50% of the lipid molecules in cellular membranes. Sphingolipids, fatty acids, and terpenoids may also be found in cell membranes, but they are not the major lipid components.

Question 20

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
linalool

Accepted Answer

The answer of Instructions: Indicate by asterisks the stereogenic centers...

Quiz 23: Biomolecules: Lipids and Their Metabolism

Instructions: Match each of the given terms to a structure from the list below.There is only one correct structure for each term,and structures may be used more than once.

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): CH3COCl,pyridine

Which of the following fatty acids has the highest melting point?

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s). Place asterisks: grandisol

Chemically,these are triacylglycerols,triesters of glycerol with three long-chain carboxylic acids.

Cell membranes,which form an effective barrier to the passage of ions and other components into and out of the cell,are:

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): NaBH4,ethanol

When soaps disperse in water,the long hydrocarbon tails cluster together in a hydrophobic ball,while the ionic heads on the surface of the cluster stick out into the water.These spherical clusters are called:

Which of the following fatty acids has the highest melting point?

Which of the following is not true about cholesterol?

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s). Place asterisks: a-santonin

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s):

Which of the following processes is used to harden an oil to give a fat?

Progesterone and progestin are examples of:

Which of the following would be expected to be found in higher concentration in butter versus olive oil?

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s). Place asterisks: abietic acid

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s). Place asterisks: lineatin

Which of the following would function in a regulatory capacity?

The major lipid components of cell membranes are:

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s). Place asterisks: linalool

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): CH₃COCl,pyridine

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below. androsterone Draw major product(s): NaBH₄,ethanol