Question 1

Which of the following best describes the solubility properties of lipids?

Accepted Answer

Insoluble in water and soluble in organic solvents

Question 2

What is the general molecular formula for a straight-chain saturated fatty acid?

Accepted Answer

$$C_nH_{2n}O_2$

Question 3

Which of the following is NOT a biological role of lipids?

Accepted Answer

Catalyst for enzymatic reactions

Question 4

A fatty acid with the formula $$CH_3$$-($$CH_2$$)_{14}-COOH$$ is best described as:

Accepted Answer

Palmitic acid

Question 5

Which of the following statements about cis and trans fatty acids is TRUE?

Accepted Answer

Cis fatty acids are primarily found in nature and cause a bend in the chain

Question 6

Which of the following fatty acids is an omega-6 polyunsaturated fatty acid with 2 double bonds?

Accepted Answer

Linoleic acid

Question 7

A patient consumes large amounts of trans fats. Which of the following health risks is most directly increased?

Accepted Answer

Increased risk of heart disease due to higher LDL cholesterol

Question 8

Which of the following best describes the systematic nomenclature for a mono-unsaturated fatty acid?

Accepted Answer

Prefix for chain length + 'enoic acid' with position of double bond

Question 9

Which of the following is a correct description of the omega (ω) nomenclature for unsaturated fatty acids?

Accepted Answer

Numbering starts from the terminal methyl group

Question 10

A fatty acid described as C20:4 ω6 is:

Accepted Answer

Arachidonic acid

Question 11

Which of the following statements about saturated fatty acids is FALSE?

Accepted Answer

They always have an odd number of carbon atoms

Question 12

Which of the following best explains why natural fatty acids are usually found in the cis configuration?

Accepted Answer

Cis configuration causes a kink, increasing membrane fluidity

Question 13

Which of the following is a correct example of a branched-chain saturated fatty acid?

Accepted Answer

Tuberculostearic acid

Question 14

A fatty acid with the formula $$CH_3$$-($$CH_2)_7-CH=CH$$-($$CH_2)_7-$$COOH$$ is best described as:

Accepted Answer

Oleic acid

Question 15

Which of the following is a key difference between mono- and polyunsaturated fatty acids?

Accepted Answer

Polyunsaturated fatty acids have more than one double bond

Question 16

Which of the following best describes the effect of hydrogenation on unsaturated fatty acids?

Accepted Answer

It converts cis double bonds to trans double bonds

Question 17

Which of the following is a correct systematic name for stearic acid?

Accepted Answer

n-octadecanoic acid

Question 18

Which of the following statements about linoleic acid is TRUE?

Accepted Answer

It is an essential fatty acid with two double bonds

Question 19

A fatty acid with the symbol C18:1 Δ9 is:

Accepted Answer

Oleic acid

Question 20

Which of the following best explains why excessive intake of palm oil may lead to increased visceral fat compared to sunflower oil?

Accepted Answer

Palm oil is rich in saturated fatty acids, which are more likely to be stored as visceral fat

Lipids and Fatty Acids: Structure, Classification, and Biological Roles

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