MOLECULES OF LIFE

Which of the following is produced from a condensation reaction protein synthesis?

• fat

• water

• dipeptide

• maltose

which of the following is a purine?

• cytosine

• guanine

• thymine

• uracil

the two strands of polynucleotides in a DNA molucule are held together by?

• Phosphodiester

• hydrogen bond

• Covalent bond

Triglycerides are formed from the condensation of

• three molecules of glycerol and one molecule of fatty acid.

• three molecules of fatty acids and one molecule of glycerol.

• three molecules of fatty acids and three molecules of glycerol.

• one molecule of glycerol and one molecule of fatty acid.

The phosphate group in phospholipids is

• Polar and hydrophilic.

• Non polar and hydrophobic.

• Ionized in water.

• Uncharged.

The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different

• Carboxyl group attached to an α-carbon.

• Amino groups attached to an α- carbon

• Side chain.

• α-carbon.

The phosphodiester linkage in DNA or RNA is formed between

• two bases.

• two sugars.

• a sugar and a base

• a sugar and a phosphate group.

What elements are present in glucose?

• P, Ag, Si

• C, H, O

• H, N, S, C

• OH, CH2

Carbon atoms are useful for making compounds because they have _______ electrons that they need to share.

• 1

• 2

• 3

• 4

Which of the following statement is TRUE about carbohydrates?

• All monosaccharides soluble in water.

• Sucrose and lactose are example of polysaccharides.

• Polysaccharides functions as long-term energy storage

  molecules.

• A disaccharide contains two monosaccharides that are joined through hydrolysis reaction.