Macromolecules of the cell, structure and function

1. Which of the following categories includes all others in the list?

• Monosaccharide

• Disaccharide

• Starch

• Carbohydrate

• Polysaccharide

Which of the following statements concerning unsaturated fats is true?

• They are more common in animals than in plants

• They have double bonds in the carbon chains of their fatty acids.

• They generally solidify at room temperature.

• They contain more hydrogen than do saturated fats having the same number of carbon atoms.

• They have fewer fatty acid molecules per fat molecules

Fluidity and melting point of fatty acids are determined in part by the number of ________ bonds

Which of the following monomer/polymer pairs is not correct?

• Monosaccharide/polysaccharide

• Amino acid/protein

• Triglyceride/lipid

• Nucleotide/DNA

• Nucleotide/RNA

Which fat has the least number of hydrogen atoms?

• Trans fat

• Saturated fat

• Unsaturated fat

• Wax

What are the monomers that make up proteins called?

• Amino acids

• Chaperones

• Dissaccharides

• Nucleotides

What may a nucleotide of DNA contain?

• Ribose, uracil, and a phosphate group

• Deoxyribose, uracil, and a phosphate group

• Deoxyribose, thymine, and a phosphate group

• Ribose, thymine, and a phosphate group

Why is it impossible for humans to digest food that contains cellulose?

• There is no energy available in fibre

• An inactive form of cellulase in the human digestive tract renders it undigested and removes it as waste

• The acidic environment in the human stomach makes it impossible to break the bonds in cellulose

• Human digestive enzymes cannot break down the alpha-1,4 glycosidic linkage in cellulose, which requires a special enzyme absent in humans.

Which of the following is NOT a feature found in all cells?

• Proteins

• Cell walls

• Ribosomes

• Cell membrane

A protein is formed from 300 amino acids. The diagrams show the primary, secondary and tertiary structures of this protein. Why the length of secondary structure is different from that of the primary structure?