[TKSS24] DP3A- Nutrients] Carbohydrates

Which elements are present in all carbohydrates?

• carbon, hydrogen, nitrogen

• carbon, hydrogen, oxygen

• carbon, nitrogen, oxygen

• hydrogen, nitrogen, oxygen

Which of the carbohydrate below does not belong to the same group as the rest?

• lactose

• galactose

• sucrose

• maltose

Which carbohydrates can be found in plants?

• cellulose

• glucose

• glycogen

• lactose

• sucrose

Which sugar will not give a positive result in the Benedict's test?

State the ratio of hydrogen to oxygen in carbohydrates.

Express your answer as x:y.

What are the products from the hydrolysis of sucrose?

• 2 glucose

• 1 fructose 1 galactose

• 1 glucose 1 fructose

• 2 fructose

What are the reasons for storing carbohydrates as polysaccharides in cells?

• Polysaccharides are more compact in shape.

• Polysaccharides can react with other molecules in the cells.

• Polysaccharides will not affect the water potential of the cell.

• Polysaccharides are soluble and can be transported around easily.

A student carried out a food test to test for presence of starch in a food sample.

What observation will she see if starch is present?

State your answer as: initial colour; final colour.

Which arrangement shows an increasing concentration of reducing sugar?

1: red ppt 2: brick-red ppt 3: yellow ppt 4: green ppt

• 2, 1, 3, 4

• 1, 2, 3, 4

• 3, 4, 2, 1

• 4, 3, 1, 2

Which carbohydrate(s) is/are found only in animals?

• lactose

• glucose

• glycogen

• cellulose