Question 1

Which of the following best describes the general formula for carbohydrates?

Accepted Answer

$C_nH_{2n}O_n$

Question 2

A monosaccharide with six carbons and a carbonyl group at the end of the chain is classified as which of the following?

Accepted Answer

Aldohexose

Question 3

Which of the following statements about glycosidic linkages is correct?

Accepted Answer

They are formed by condensation reactions between monosaccharides.

Question 4

Which carbohydrate is the primary structural component of plant cell walls and is composed of $\beta$-glycosidic linkages?

Accepted Answer

Cellulose

Question 5

Which of the following is a disaccharide formed from glucose and fructose?

Accepted Answer

Sucrose

Question 6

What is the main difference between an aldose and a ketose?

Accepted Answer

Aldoses have a carbonyl group at the end of the carbon chain, while ketoses have it in the middle.

Question 7

Which of the following best explains why plant oils are liquid at room temperature?

Accepted Answer

They contain unsaturated fatty acids with double bonds that create kinks, preventing tight packing.

Question 8

Which of the following is a chemically modified carbohydrate that provides structural support in arthropod exoskeletons?

Accepted Answer

Chitin

Question 9

Which of the following is true about phospholipids in biological membranes?

Accepted Answer

Their hydrophilic heads face outward toward water.

Question 10

A blood type is determined by specific oligosaccharide chains attached to red blood cells. Which property of oligosaccharides makes them suitable for this function?

Accepted Answer

They can include additional functional groups that influence recognition.

Question 11

Which of the following is a correct description of the amphipathic nature of fatty acids?

Accepted Answer

They have a hydrophilic carboxyl head and a hydrophobic hydrocarbon tail.

Question 12

Which of the following is a function of cholesterol in cell membranes?

Accepted Answer

It maintains membrane fluidity and integrity.

Question 13

Which of the following is a correct statement about the difference between starch and cellulose?

Accepted Answer

Starch has $\alpha$-glycosidic linkages, while cellulose has $\beta$-glycosidic linkages.

Question 14

Which of the following is a correct description of a triglyceride?

Accepted Answer

It is composed of three fatty acids and one glycerol molecule.

Question 15

Which of the following is an important intermediate in glycolysis and contains two phosphate groups attached to a fructose molecule?

Accepted Answer

Fructose 1,6-bisphosphate

Question 16

Which of the following best explains why enzymes required to hydrolyze starch and cellulose are different?

Accepted Answer

Starch and cellulose have different types of glycosidic linkages ($\alpha$ vs $\beta$), requiring specific enzymes.

Question 17

Which of the following is a correct statement about monosaccharides?

Accepted Answer

They are simple sugars and can exist as straight chains or rings.

Question 18

Which of the following is true about the ring form of glucose?

Accepted Answer

It can exist as either $\alpha$- or $\beta$-glucose, which can interconvert.

Question 19

Which of the following is a correct description of the role of polysaccharides in living organisms?

Accepted Answer

They serve as energy storage and structural components.

Question 20

Which of the following is a correct statement about the structure of steroids?

Accepted Answer

They are characterized by four fused carbon rings.

Ch 3 lecture carbs and lipids

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