Question 1

Which of the following statements best explains why unsaturated fatty acids have lower melting points than saturated fatty acids?

Accepted Answer

The cis double bonds in unsaturated fatty acids introduce kinks, preventing tight packing and lowering melting point.

Question 2

Which of the following is NOT a function or property of prostaglandins in the human body?

Accepted Answer

Storage in adipose tissue for energy

Question 3

A fatty acid is described as 18:2 (Δ9,12). What does this notation mean?

Accepted Answer

The fatty acid has 18 carbons and 2 double bonds at carbons 9 and 12.

Question 4

Which of the following is a correct statement about trans-fatty acids?

Accepted Answer

Trans-fatty acids are produced artificially and can increase inflammation and risk of heart disease.

Question 5

Which of the following lipids is amphipathic and a major component of cell membranes?

Accepted Answer

Glycerophospholipids

Question 6

A patient is prescribed aspirin to reduce inflammation. Which enzyme does aspirin inhibit to achieve this effect?

Accepted Answer

Cyclooxygenase (COX)

Question 7

Which of the following statements about omega-3 fatty acids is TRUE?

Accepted Answer

Omega-3 fatty acids have their first double bond at the third carbon from the methyl (omega) end.

Question 8

Which of the following is a correct description of a biological wax?

Accepted Answer

A wax is an ester formed from a long-chain fatty acid and a long-chain alcohol.

Question 9

Which of the following is NOT a consequence of excessive trans-fatty acid consumption?

Accepted Answer

Decreased blood triglyceride levels

Question 10

Which of the following best describes the role of COX-2 enzyme?

Accepted Answer

COX-2 is responsible for prostaglandin production in response to inflammation or tissue injury.

Question 11

Which of the following is a correct statement about the structure of saturated fatty acids?

Accepted Answer

Saturated fatty acids have no carbon-carbon double bonds and can pack tightly together.

Question 12

Which of the following is a major function of bile salts in the digestive system?

Accepted Answer

Bile salts emulsify dietary fats, aiding in their digestion and absorption.

Question 13

Which of the following is TRUE regarding the amphipathic nature of phospholipids?

Accepted Answer

Phospholipids have both hydrophobic and hydrophilic regions, allowing them to form bilayers in membranes.

Question 14

Which of the following is the correct formula for the general structure of a fatty acid?

Accepted Answer

$$\mathrm{R{-}COOH}$$

Question 15

Which of the following is a correct statement about triacylglycerols?

Accepted Answer

Triacylglycerols are the main storage form of energy in adipose tissue.

Question 16

Which of the following is TRUE about the transport of molecules across cell membranes?

Accepted Answer

Symporters transport two different molecules in the same direction.

Question 17

Which of the following is a correct description of the role of thromboxanes?

Accepted Answer

Thromboxanes induce platelet aggregation and vasoconstriction.

Question 18

Which of the following is a correct statement about the cis isomer in unsaturated fatty acids?

Accepted Answer

The cis isomer introduces a kink in the hydrocarbon tail, affecting packing and melting point.

Question 19

Which of the following is the correct chemical reaction for the formation of a triacylglycerol?

Accepted Answer

$$\mathrm{Glycerol + 3\ Fatty\ Acids \rightarrow Triacylglycerol + 3\ H_2O}$$

Ch. 17: Lipids

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