Biomolecules Review

Carbohydrates are transported in plants mainly in the form of

• starch

• sucrose

• glucose

• fructose

Which of the following statements is true about BOTH isomers of glucose?

• Both contribute to the structure of starch.

• Both contribute to the structure of cellulose.

• Structure 1 contributes to the structure of cellulose, and Structure II contributes to the structure of starch.

• Structure 1 contributes to the structure of starch, and Structure II contributes to the structure of cellulose.

Which of the following arrangements is the correct orientation of 'heads' and 'tails' of phospholipids in a bi-layer?

• Head away from water; Tail away from water

• Head away from water; Tail towards water

• Head towards water; Tail towards water

• Head towards water; Tail away from water

Collagen exhibits a secondary level of protein structure and organization because

• it contains four polypeptide chains

• each chain forms a helix held by covalent bonds

• each chain forms a helix held by hydrogen bonds

• it is made up of repeated units of three different amino acids

This chemical structure represents a molecule of

• triglyceride

• tripeptide

• triphosphate

• trisaccharide

Which of the following BEST represents the structure of a triglyceride?

• 
• 
• 
• 

Which of the following occurs in the tertiary structure but NOT in the primary structure of a protein?

• 
• 
• 
• 

Pistia stratiotes (water lettuce) is a rosette-like plant found floating in ponds and natural waterways.

Which of the following properties of water assists the plants to float?

• High cohesion

• High specific heat

• High latent heat of fusion

• High latent heat of vaporization

Which of the following biological molecules has both hydrogen and disulphide bonds?

• ATP

• DNA

• Insulin

• Triglyceride

Which of the biological molecules forms the MAIN component of the cell membrane in animals?

• I

• II

• III

• IV