Topic 2.3: Carbohydrates & Lipids

Which of the molecules shown would be most suitable for long-term energy storage in humans?

• A

• B

• C

• D

What type of molecule is formed by the chemical reaction shown in the diagram?

• Dipeptide

• Disaccharide

• Diglyceride

• Cellulose

The diagram shows a type of fatty acid. What type of fatty acid is shown?

• Trans unsaturated

• Cis unsaturated

• Trans saturated

• Cis saturated

The diagram shows two polysaccharides, formed from condensation of many glucose molecules. What are the names of X and Y?

• X: glycogen, Y: amylose

• X: amylopectin, Y: amylase

• X: amylase, Y: glycogen

• X: amylose, Y: amylopectin

Which type(s) of fatty acid in the diet is/are positively correlated with an increased risk of coronary heart disease?

I.   Saturated

II.  Trans unsaturated

III. Cis unsaturated

• I only

• I and II only

• II only

• II and III only

Which molecule represents a lipid?

• A

• B

• C

• D

A polymer of alpha-D-glucose found in plants has mostly 1,4 linkages and some 1,6 linkages. Which molecule fits this description?

• Glycogen

• Cellulose

• Amylose

• Amylopectin

Which type of reaction is the breakdown of starch into sugars?

• Denaturation

• Reduction

• Catabolic

• Condensation

The diagram shows a molecular structure.

• Amino acid

• Lipid

• Carbohydrate

• Nucleotide

Which always contains carbon, hydrogen and oxygen?

I. Carbohydrate

II. Protein

III. Fat

• I and II only

• I and III only

• II and III only

• I, II and III