Carbs and Lipids Quiz

Molecules that are soluble in water have which type of bond?

• polar covalent bond

• nonpolar covalent bond

• hydrophobic interaction

• double bonds

What is true for double bonds?

• Double bonds are weaker than single bonds.

• Double bonds keep molecules straight.

• Unsaturated fats have double bonds and are associated with good cardiovascular health.

Which polysaccharide has the greatest number of branches?

• cellulose

• amylose

• amylopectin

• glycogen

All lipids

• contain nitrogen.

• have low energy content.

• are acidic when mixed with water.

• are poorly water soluble.

If you were given a sample of a polysaccharide and told that the only subunit was glucose, what would you have?

• glycogen

• cellulose

• amylopectin

• You cannot know from the information given.

Answer explanation

Answer: E. Glucose is the subunit for all of the polysaccharides listed.

Which sugar is most important for making R N A?

• glucose

• ribose

• fructose

• glyceraldehyde

• sucrose

Answer explanation

Ribose is part of the immediate structure of DNA.

Which provides the most compact energy storage?

• proteins

• carbohydrates

• lipids

• All provide about the same amount of energy stored per unit volume.

The molecular formula of a fatty acid is C₁₇H₃₅COOH. This is a ...

• Saturated fatty acid

• Monounsaturated fatty acid

• Polyunsaturated fatty acid

Answer explanation

Saturated fatty acids have the maximum number of hydrogen atoms possible and no double bonds.

What functional group is most critical to energy metabolism in the cell?

• hydroxyl

• amino

• carboxyl

• phosphate

• carbonyl

Answer explanation

Phosphate groups make up part of the energy currency of the cell - ATP (Adenosine triphosphate)

For what is water most important when digesting food?

• condensation reactions

• temperature reduction

• hydrolysis reactions

• none of the above

Answer explanation

the breakdown of macromolecules occurs by the addition of water to the bonds, releasing subunit molecules.