MOLECULES OF LIFE (T2)

A carbohydrate energy storage molecule found in animal liver

and muscle cells

• starch

• glycogen

• cellulose

• fatty acids and cholesterol

Tags

NGSS.HS-LS1-7

Which of the following statement is TRUE about lipids?

• Phospholipids have hydrophilic tails and hydrophobic

  heads.

• Glycerol, a building molecule of triglyceride is soluble in water.

• Fatty acid consists of a short hydrocarbon chain with a-

  OH group at one end.

• Saturated fatty acids have double bond while unsaturated

  fatty acid has no double bond between the carbon atoms.

Which of the following are TRUE for triglyceride?

I they are soluble in non-polar organic solvents

II they are not soluble in water

III they are esters formed from the reactions between fatty

acids and alcohols.

• I and II

• I and III

• II and III

• I, II and III

Tags

NGSS.HS-LS1-6

The major function(s) of lipids includes ...

• storing energy.

• serving as structural components of cellular membranes.

• serving as hormones.

• All of the above are correct.

The hydrolysis of triacylglycerol will yield ...

• three fatty acids and one glycerol.

• three glycerols and one fatty acid.

• two fatty acids and three glycerols.

• one fatty acid, one phosphate, and one glycerol.

Which of the following is produced from a condensation

reaction during protein synthesis?

• Fat

• Water

• Dipeptide

• Maltose

Glutamic acid and lysine can be distinguished by ...

• their ability to form peptide bonds.

• their composition of their side chain.

• the position of their carboxyl groups.

• the position of their amino groups.

Which of the following is a purine?

• Cytosine

• Guanine

• Thymine

• Uracil

The two strands of polynucleotides in a DNA molecule are held

together by ...

• peptide bond.

• hydrogen bond.

• glycosidic bond.

• phosphodiester bond.

Which of the following statements is NOT TRUE about nucleic

acids?

I RNA molecule is longer than DNA molecule

II in the deoxyribose molecule, the oxygen at the second

carbon is removed

III the bases involve in RNA is uracil, guanine, cytosine and

adenine

IV the function of rRNA is to carry amino acid to the site of

protein synthesis

• I and II

• II and III

• I and IV

• III and IV