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Describe the structure of a protein.

Proteins are made up of long chains of amino acids (polypeptides) joined together by condensation reaction. Primary structure The proteins primary structure is the sequence and order of amino acids in the pe...
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Answered by Eilidh F. • Biology tutor
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Explain how blood is pumped around the body

Oxygenated blood flows into the left atrium from the lungs via the pulmonary vein, when the left atrium contracts the blood flows down into the left ventricle via the mitral valve (which divides the atrium f...
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Answered by Raechel P. • Biology tutor
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Describe 3 differences between mitosis and meiosis

Mitosis consists of one stage whereas meiosis consists of two stages. Mitosis produces diploid cells (46 chromosomes) whereas meiosis produces haploid cells (23 chromosomes). Mitosis produces two identical d...
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Answered by Runzhi C. • Biology tutor
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Describe how a heartbeat is initiated and coordinated?

The sinoatrial node (SAN) sends a wave of electrical activity across the atria causing atrial contraction. The non-conducting tissue stops the immediate contraction of the ventricles. The atrioventricular no...
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Answered by Dharani Y. • Biology tutor
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Describe how different environmental factors affect: the direction of growth of roots the direction of growth of shoots. In your answer you should refer to the role of plant hormones.

Here a thoroughly thought out response to the question should be formulated it is not enough to simply know the name and role of plant hormones within it. Start with a factor, it is helpful to know terminolo...
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