Biology IGCSE revision

What are the levels of living organisms from smallest to largest?

• Tissue - Organ Systems - Cells - Organs - Organism

• Cells - Tissue - Organs - Organ Systems - Organisms

• Organs - Organ Systems - Organisms - Cells - Tissue

• Cells - Tissue - Organisms - Organ Systems - Organs

Which part of the digestive system had a low pH to help the enzymes with low optimum pH level

• Mouth

• Large Intesine

• Small Intestine

• Stomach

Which one of these statements about enzymes is FALSE?

• The active site on the enzyme has a specfic shape to only fit one substrate.

• When the temperature around the enzyme is above it's optimum temperature, the enzyme will start to denature.

• Enzymes can speed up reactions. Examples can be breaking down molecules, or putting molecules together.

• When a enzyme is in a pH that is not in it's optimum pH range, it will die.

• Denaturing is when the enzyme, and it's active site, change shape.

Protease breaks down (a)   molecules.

Lipase breaks down (a)   molecules.

Amylase breaks down (a)   molecules.

What does Bile do in digestion?

• Protects the cells in the stomach lining from the acid inside it.

• Allows the lock and key model of the enzymes to work properly.

• Creates better conditions for good bacteria to grow in digestive system.

• Emulsifies fats (turns large fat droplets into smaller ones).

Bile is made in the ______ and released from the_____.

• Liver, Gall Bladder

• Kidneys, Small Intestine

• Pancrease, Stomach

• Saliva Glands, Mouth

The reagents for testing for the following food; Fats, Sugars, Proteins, Starch

• Ethanol, Benedict's, Biuret, Iodine

• Benedict's, Biuret, Iodine, Ethanol

• Biuret, Iodine, Benedict's, Ethanol

• Iodine, Benedict's, Ethanol, Biuret

What are the two different names of heart chambers?

• Atria & arteries

• Atria & ventricles

• Arteries & ventricles

• Atria & valves