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Explain the causes and effects of increasing levels of carbon dioxide in the atmosphere

Carbon dioxide is a greenhouse gas that is produced through the burning of fossil fuels such as coal, oil and gas. Increased demands for electricity, heating and cars etc. means that more fossil fuels are be...
LK
Answered by Lydia K. • Biology tutor
22697 Views

What does a vaccine contain?

Short answer: Dead and/or inactive pathogens. Explanation (also to a further question: "How does this prevent infection later?") : Pathogens are microorganisms that cause disease. When the body is ...
MS
3709 Views

Describe the path of a red blood cell through the heart

Red blood cell arrives from the inferior vena cava into right atrium before it passes through the tricuspid valve into right ventricle. It then passes through the pulmonary valve into pulmonary artery before...
RW
Answered by Robert W. • Biology tutor
76245 Views

Describe the function of receptors in the skin. (2 Marks)

Detect surounding stimuli. Convert that information to impulses and send to the brain.
TD
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(Substrate) is hydrolysed by (Enzyme). Explain why (Enzyme) catalyses only this reaction. (3 Marks)

Active site of (enzyme) has a specific active site, complementary to (substrate). Only that (substrate) can bind to this active site to form an enzyme substrate complex.
TD
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