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Explain the principles of PCR

The Polymerase Chain Reaction (PCR) is a method of DNA amplification in vitro. It consists of 3 stages - denaturation, annealing and extending. PCR relies on the use of a thermophilic Taq polymerase enzyme.
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Answered by David B. • Biology tutor
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State the differences between introns and exons.

Introns and exons are parts of genes - exons code for proteins, whereas introns do not, ie: exons are converted into messenger RNA to allow these parts of the gene to then be transcribed into protein. Intron...
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Answered by David B. • Biology tutor
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Name the major organs of the Gastrointestinal tract

Oral cavity, Oesophagus, Stomach, duodenum, jejunum, ileum, colon, rectum, anus.
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Answered by David B. • Biology tutor
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Explain what is meant by active transport

Avtive transport is the transport of molecules against their concentration gradient (that is, from a low concentration to a high concentration). This mechanism requires energy, and so ATP is used up.
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Answered by Arantxa B. • Biology tutor
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What's an Apical Meristem

1) Tissue composed of undifferentiated totipoten cells in plants 2) Found in roots and shoots 3) Responsible for vertical growth 4) produces PRIMARY phloem and xylem 5) Produces Leaves and Flowers
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Answered by Hans S. • Biology tutor
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