GCSE Biology 1

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  • Created by: fayemcc
  • Created on: 31-03-16 14:36
What is your metabolic rate and what factors effect it?
Your metabolic rate is the speed at which chemical reactions occur in your body. It is affected by your: muscle to fat ratio; gender; regular exercise and genetics.
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Name three health problems caused by eating in excess and what of the diet causes it.
An excess of carbohydrates or fat in the diet can lead to obesity. Too much saturated fat can increase your blood cholesterol and too much salt in your diet can cause high blood pressure which can lead to blood clots.
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What is cholesterol used for in body?
Cholesterol is needed to make cell membranes.
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What conditions are associated with high blood cholesterol levels?
Atherosclerosis- a plague build up in the arteries which can lead to heart attacks and strokes.
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What produces antibodies and how do they fight pathogens?
Antibodies are produced by the B cells (a type of lymphocyte) in the presence of antigens. Antibodies attach to antigens so that the pathogen clumps together (agglutination) which facilitates the destruction of the pathogen by phagocytosis.
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Why is asexual reproduction useful for bacteria?
It's quick. As there is no genetic variation, an antibiotic resistant bacteria will replicate leading to more resistant bacteria.
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Why can't antibiotics treat viruses?
Antibiotics don't harm human cells consequently they can not kill viruses because they use human cells as host in our body.
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What does a vaccine contain?
A vaccine contains a small amount of dead or weakened (attenuated) micro-organisms.
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What did Semmelweiss do?recognise to lower the death rate of women who had given birth in Vienna general hospital?
He saw that large numbers of women were dying after childbirth from a disease called puerperal fever.
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Why should cultures of micro-organisms be incubated at a maximum of 25 degrees C in schools?
To reduce the likelihood of growth of pathogens that might be very harmful.
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Draw a neurone.
.
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Describe the first two stages for a nerve impulse passing through a synapses.
An impulse reaches the end of a neurone. If the impulse is strong enough it pushes the synaptic vesicles to edge of the neurone releasing neurotransmitter molecules into the synaptic cleft.
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Describe the next two stages.
The neurotransmitter molecules diffuse across the synaptic cleft and bind to receptors on the next neurone. This triggers another impulse to pass through the next neurone.
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What is a hormone and where are they produced?
Hormones are chemical messengers which travel in the blood to target organs that require constant change. They are produced in glands.
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What are the differences between nerves and hormones?
Nerves are fast, they act for a short time and on a precise area. Hormones are slower, they have a long lasting affect and act in a more general way.
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What hormones are used in oral contraception and why?
Oestrogen because it inhibits the production of FSH so the egg will not mature. Progesterone because it stimulates the production of thick cervical mucus which prevents the sperm getting through.
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How do plant roots respond to two different stimuli?
Geotropism: grows in the direction of gravity. Moisture: grows towards moisture.
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Give two adaptations specific to animals living in the desert.
Large surface area to volume ratio to increase energy transfer from the body. Controlling water loss by producing small amounts of concentrated urine and also make very little sweat.
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Give two more.
Thin layers of body fat for less insulation, for example camels keep nearly all their fat in their humps. Animals can be camouflaged to avoid predators.
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What are the four stages of the menstrual cycle?
.
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Other cards in this set

Card 2

Front

Name three health problems caused by eating in excess and what of the diet causes it.

Back

An excess of carbohydrates or fat in the diet can lead to obesity. Too much saturated fat can increase your blood cholesterol and too much salt in your diet can cause high blood pressure which can lead to blood clots.

Card 3

Front

What is cholesterol used for in body?

Back

Preview of the front of card 3

Card 4

Front

What conditions are associated with high blood cholesterol levels?

Back

Preview of the front of card 4

Card 5

Front

What produces antibodies and how do they fight pathogens?

Back

Preview of the front of card 5
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