Chemicals of Life

The basic unit of carbohydrates is a

• amino acid

• monosaccharide

• disaccharide

• polysaccharide

The elements C, H and O are the only elements found in:

• proteins

• carbohydrates

• carbohydrates and lipids

• carbohydrates, lipids and proteins

When digested the fat molecule is broken into:

• fatty acids

• amino acids

• glycerol

• fatty acids and glycerol

The disaccharide maltose consists of:

• glucose + glucose

• fructose + glucose

• glucose + galactose

Benefits of eating small amounts of fats include: (tick all the right answers)

• growth and repair

• energy production

• insulation

• production of enzymes

• protection of certain internal organs

Characteristics of enzymes include: (Tick all the right answers)

• They provide energy

• They are biological catalysts

• They become denatured at high temperatures

• They are part of the reaction

• They are highly specific

Sodium hydroxide and copper sulphate are used to test for the presence of:

• Fats

• Reducing sugars

• Starch

• Proteins

Reducing sugars are tested for as follows:

• Add Benedict's solution only

• Add Benedict's solution and heat

• Add Benedict's solution and Iodine solution

• Add Iodine solution only

The condition shown in the image is associated with lack of:

• Vitamin A

• Vitamin C

• Vitamin D

By eating carrots, one can avoid

• Scurvy

• Night blindness

• Rickets

• Osteoporosis