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What is osmosis and where does it occur in the human body?

Osmosis is the movement of water from areas of high concentrations to lower concentrations across a semi permeable membrane. It occurs over these membranes in cells of the body alllowing water to move into a...
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Answered by Martha K. • Biology tutor
55870 Views

Explain why it is important to take a full course of prescribed antibiotics.

An individual may feel better before completing a full course of antibiotics, however, this does not mean that all of the bacteria in the body have been destroyed. If low levels of bacteria remain in the bod...
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Answered by Laura M. • Biology tutor
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What is an enzyme and how does it work?

An enzyme is a biological catalyst (something that speeds up a chemical reaction), which is a protein, a chain made of many amino acid molecules. An enzyme has its own unique three-dimensional structure, whi...
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Answered by Merle B. • Biology tutor
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What is the difference between diffusion and active transport?

Diffusion is the movement of particles from a high concentration to a low concentration . This process does not require energy. An example of diffusion is oxygen moving from the airways to the lungs - there ...
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Answered by Emma W. • Biology tutor
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Explain the structure of DNA.

DNA is a polymer made up from monomer units. The monomers that make up a DNA molecule are called nucleotides. Nuceleotides are made up of a nucelic acid (adenine/guanine/thymine/cytosol); a five carbon sugar...
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Answered by Geraldine C. • Biology tutor
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