Pre-IGCSE Biology 2

Which hormone is known as the fight or flight hormone?

• Adrenaline

• Glucagon

• Insulin

• Glycogen

A hormone is a chemical substance produced by ...

• A gland

• The liver

• A target organ

• The blood

Hormones are eventually removed from the blood and destroyed by which organ?

• Kidneys

• Liver

• Brain

• White blood cells

Which of the following are effects of adrenaline on the body?

• Increasing breathing rate

• Decreasing pulse rate

• Causing radial muscles in the iris to contract

• Causing circular muscles in the iris to contract

• Causes blood glucose levels to increase

How do liver cells respond to increased insulin levels in the blood?

• They absorb glucose and convert it to glycogen

• They absorb glucose and convert it to glucagon

• They break down glucagon and release the glucose into the blood

• They break down glycogen and release the glucose into the blood

• They release glucagon into the blood

What is an allele?

• an organisms genome

• different versions of the same gene

• same versions of different genes

• different chromosomes

In making yoghurt, why must the milk be pastuerised to 80ºC first?

• To improve the flavour

• To create more lactic acid

• To evenly distribute the fat

• To prevent the groth of unwanted bacteria

What are the products of anaerobic respiration of bacteria used in yoghurt making?

• carbon dioxide and water

• carbon dioxide an oxygen

• lactic acid

• lactic acid and water

Name a bacteria that can be used in yoghurt making.

• E.coli

• Listeria

• Lactobacillus

• Salmonella

What is the function of the air inlet in the ferementer?

• Provide clean air

• Provide oxygen for the aerobic respiration of microrganisms

• Provide carbon dioxide for the anaerobic respiration of microrganisms

• Mixes the solution to keep nutrients and temperature evenly distributed.