IGCSE - Biological Molecules

Which nitrogen containing substances form the building blocks of proteins?

Tags

NGSS.HS-LS1-6

NGSS.HS-LS1-1

Starch is a large molecule built up from repeating units of which simpler molecule?

What nutrient molecule is described here? "A polymer made of amino acids that is an important type of biological molecule used for building bodies."

Tags

NGSS.HS-LS1-6

What is a disaccharide?

• A sugar, such as sucrose or lactose, made up of two sugar units.

• Any complex carbohydrate molecule that is a polymer of sugar units.

• A storage molecule, such as starch, made of repeating sugar units.

• The products of digestion of a polysaccharide.

What is the main storage polysaccharide in animals and fungi?

• glycogen

• starch

• glucose

• cellulose

Which elements are present in carbohydrates such as glucose and starch?

• carbon

• nitrogen

• hydrogen

• oxygen

Tags

NGSS.HS-LS1-6

Complete the following sentence. Enzymes are made of …………………….. .

Tags

NGSS.HS-LS1-1

What is cellulose used for by plants?

• To absorb water by osmosis

• To absorb light energy

• For cell membranes

• For cell walls

What is described here? "A high energy food storage molecule made up of long fatty acid molecules combined with glycerol. Used by plants and animals - also important for insulation in animals"

Which of the following statements is referring to starch?

• Combined with magnesium ions from the roots, this substance is essential for the capture of the light energy in the chloroplasts.

• Synthesised from glucose made by photosynthesis and nitrate and phosphate ions from the roots, this substance is an essential component of the nucleus.

• Synthesised from glycerol and fatty acids made from the products of photosynthesis, this substance is used by plants for cell membranes and to store energy in seeds.

• Synthesised from glucose made by photosynthesis, this substance is used by plants to store energy in leaves and in the roots.