Chapter 2 Quiz 2

Which of the following molecules is the main component of cell membranes?

• glucose

• starch

• cellulose

• phospholipid

Which of the following molecules is the main component of plant cell walls?

• glucose

• starch

• cellulose

• phospholipid

Which of the following molecules can act as an immediate energy source?

• glucose

• starch

• cellulose

• phospholipid

Which of the following molecules can act as an energy storage?

• glucose

• starch

• cellulose

• phospholipid

Proteins are made from (a)_______________ that are joined by (b)_______________ .

• (a) fatty acids；(b) peptide bond

• (a) fatty acids；(b) dipeptide bond

• (a) amino acids；(b) peptide bond

• (a) amino acids；(b) dipeptide bond

Nucleic acids are built up from subunits called _______________ .

• riboses

• nucleotides

• ribonucleic acids

• deoxyribonucleic acids

DNA is found mainly in the _______________ of a cell.

• nucleus

• vacuoles

• chloroplasts

• cell membrane

A DNA molecule consists of two (a)_______________ chains coiled around each other to form a (b)_______________ .

• (a) dinucleotide；(b) single helix

• (a) dinucleotide；(b) double helix

• (a) polynucleotide；(b) single helix

• (a) polynucleotide；(b) double helix