Biology Unit 1

Front 1

What is sexual reproduction (1 mark)

Back 1

When a female and male gamete fuse together

Front 2

A zorse has characteristics of zebra and horse. Why? (2 marks)

Back 2

The zorse will have a mixture of genes from both parents ,horse and zebra

Front 3

Describe how adult cell cloning could be used to clone a zorse (6 marks)

Back 3

Take skin cell from zorse and unfertilised egg cell from horse.

Remove nucleus from egg cell and skin cell.

Put skin cell nucleus into the empty egg cell

Electric Shock

Causes egg to divided and forms an embryo.

Embryo is placed back into womb of horse

Front 4

What does MMR stand for?

Back 4

Measles, mumps and rubella

Front 5

Describe what happens in the body AFTER immunisation to stop the person catching a disease in the future (3 marks)

Back 5

White blood cells produce antibodies

The antibodies destroy the pathogens

In the future if re-infected , antibody production is quicker

Front 6

Students investigated a food chain.
The students found 650 aphids feeding on one bean plant. 5 ladybird feeding on the aphids.
Draw a pyramid of biomass for the food chain and label.

Back 6

Front 7

The biomass in the 5 ladybirds is less than the biomass in the bean plant
Give 2 reasons why

Back 7

Some biomass is lost in urine and faeces

Respiration (CO2)

Front 8

The carbon in a dead bean plant is returned to the atmosphere via the carbon cycle

Describe this part of the carbon cycle

Back 8

Microbes decompose the bean plant when it's dead.

The microbes respire releasing carbon dioxide back into the atmosphere

Front 9

What is a hormone?

Back 9

A chemical message that is secreted from a gland that controls body function

Front 10

How are hormones transported to their target organs?

Back 10

In the blood

Front 11

Describe how FSH, oestrogen and LH are involved in the control of the menstrual cycle

Back 11

Oestrogen causes lining of womb to develop , it inhibits FSH production and stimulates the release of a mature egg.

FSH causes egg to mature and stimulates ovary to produce oestrogen

When LH reaches its peak mid way during the cycle, LH stimulate the release of a new egg.

Front 12

What scientific term describes a change in a gene

Back 12

Mutation

Front 13

Second question

Back 13

The new mutant gene was resistant to the Wolbachia bacteria

so more males survived.

Survivors bred with female Blue-moon butterflies and the gene was passed from survivors to offspring.

Front 14

Before the clinical trials, drugs are tested in the lab. The lab trials are NOT trials on people.
What is the drug tested on in these lab trials?

Back 14

Cells

Front 15

Drugs must be trialled before the drugs can be used on patients.
Give 3 reasons why.

Back 15

Test to make sure they are not harmful

To see if the drug works

See how much of drug is needed

Front 16

Name neurons A, B and C

Back 16

A- sensory
B- motor
C-relay

Front 17

The receptor in the muscles in the leg is sensitive to a stimulus
Suggest the stimulus

Back 17

Pressure

Front 18

Describe what happens at the synapse

Back 18

The electrical impulse stops when it reaches the synapse it secretes a chemical

which diffuses along the gap

and starts an electrical impulse along the next neurone