AQA GCSE Biology Practice Test- Unit 3 Organisation and the Digestive System

What is an organ?

A group of similar cells

A collection of tissues

The basic building block of an organism

The vital part of an organ system

Select the tissue below that is found in the stomach.

Epithelial tissue

Connective tissue

Nervous tissue

Vascular tissue

What is the purpose of the glandular tissue, found in the stomach?

Churn the food and the digestive juices

Cover the internal and external layer of the stomach

Produce the digestive juices needed to break down the food

Transport water and minerals to the stomach

Select three organs below which are part of the digestive system.

Stomach

Heart

Small intestine

Liver

What is the purpose of the pancreas in the digestive system?

Absorbs water from food and passes it back to the body

Releases digestive juices containing enzymes to break down food

Churns food with digestive juices and acids

Absorbs small digested food molecules

By which process does small, soluble food molecules get absorbed into the bloodstream?

Diffusion

Active transport

Osmosis

Emulsification

How is the small intestine adapted to have a large surface area?

It shrinks itself to have a larger surface area to volume ratio

It is covered with villi

It is covered with capillaries

It doesn't; the large intestine has a large surface area

What is the purpose of the liver in the digestive system?

Release hormones and digestive juices

Churn the food up with digestive juices and acids

Release bile, which emulsifies lipids

Pass small, soluble food molecules into the bloodstream

Which three elements are contained within carbohydrates?

Carbon, hydrogen and nitrogen

Carbon, oxygen and iron

Hydrogen, oxygen and helium

Carbon, hydrogen and oxygen

Carbohydrates are divided into what two categories?

Simple sugars and complex carbohydrates

Animal carbohydrates and plant carbohydrates

Simple carbohydrates and complex sugars

They aren't divided into any categories

Which group of enzymes break down lipids into fatty acids and glycerol?

Carbohydrases

Lipases

Proteases

Bilases

What are proteins broken down into?

Fatty acids

Glycerol

Amino acids

Simple sugars

What are enzymes?

Biological catalysts which speed up reactions

A digestive juice which helps in digesting proteins

A group of organs which have the ability to detect electrical impulses

The waste products of absorption of food molecules

What is the active site of an enzyme?

The part of the enzyme which receives minerals and water

The part of the enzyme where the respiration occurs

The part of the enzyme which binds to a specific substrate

The part of the enzyme which speeds up metabolism

What happens to enzymes when they reach a high temperature?

The amino acid chains unravel and change the active site

The enzyme gains a lot of energy so it can work very efficiently

The enzyme gets broken down and killed

Microorganisms can infect the enzyme

What name is given to the pH where enzymes work most efficiently?

Maximum pH

Minimum pH

Optimum pH

Best pH

Select the two organs below where lipases are produced.

Pancreas

Salivary gland

Liver

Small intestine

Select an example of a protease from the below.

Salivary amylase

Maltose

Trypsin

Melanin

How does the stomach allow protease enzymes to work efficiently?

It contains calcium hydroxide, giving an alkaline concentration

It alters the surface area of the food molecules

It contains hydrochloric acid, giving an acidic concentration

It neutralises any acids or bases that it comes across

How does the small intestine allow enzymes to work well?

It neutralises the acidic food molecules coming from the stomach

It allows a large surface area for the enzymes to work

It makes the alkaline food, coming from the stomach, acidic

It uses bile to make the acidic food alkaline

What are gall stones?

Stones that stop bile being released into the food

Hormones released by the gallbladder to help in digestion

Enzymes that are produced in the gallbladder

The waste products of digestion which is egested from the body

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AQA GCSE Biology Practice Test- Unit 3 Organisation and the Digestive System

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