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What is a protein and what functions can a protein have?

A protein molecule is a polymer which means it is built when lots of smaller molecules join together in a chain, like building blocks. These smaller molecules are called amino acids. There are are 20 differe...
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Answered by Joanna T. • Biology tutor
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describe how the plant hormone auxin and light affects the direction of growth of plants

The hormone auxin causes cells in shoots to grow faster, and cells in roots to grow more slowly. Auxin becomes more concentrated on the side of the plant that is not facing the light, the shaded side. In the...
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Answered by Niamh D. • Biology tutor
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What is diffusion?

By definition, diffusion is the movement of particles from a region of high concentration to a region of low concentration. It occurs in liquids and gases where particles can move freely down a concentration...
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Answered by Eleanor D. • Biology tutor
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What is a reflex action?

A reflex action is the body's rapid, involuntary response to external stimuli, often used in order to protect it from immediate harm. First, a receptor detects a stimulus, such as a heat source which could b...
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Answered by Nat A. • Biology tutor
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What is the difference between DNA and RNA?

DNA, deoxyribonucleic acid, is responsible for storing genetic information and is composed of a chain of nucleotides. Each nucleotide is formed by a nitrogen base, a phosphate backbone and a sugar. There are...
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Answered by Ana D. • Biology tutor
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