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Describe the differences in structure of arteries, veins and capillaries.

Arteries: carry blood away from the heart, have thick muscular walls, have small lumens, and contains blood under high pressure. Veins: carry blood to the heart, have thin walls, have large lumens, contains ...
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Answered by Mehjaben R. • Biology tutor
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Describe how altered DNA can lead to cancer.

If a mutation occurs in the section of DNA that is the tumour suppressor gene, and if this mutation changes the amino acid sequence that the gene codes for (in most cases, there is more than one codon per am...
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Answered by Amani M. • Biology tutor
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What is transcription and describe the process

What is transcription - The first step of protein synthesis occurring in the nucleus in eukaryotes. Conversion of DNA into RNA, allowing it to leave the nucleus (whilst retaining the genetic information) to ...
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Answered by William M. • Biology tutor
3112 Views

List 6 structural components of a mammalian eukaryotic cell

Cell membrane, nucleus, ribosomes, mitochondria, rough endoplasmic reticulum, smooth endoplasmic reticulum, Golgi apparatus, Golgi vesicles, cytoplasm, lysosome, vacuole
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Answered by Alice T. • Biology tutor
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Explain what the reflex arc is, how it is different to how the central nervous system normally works, and how the arc itself works.

To answer this question, you need to know what the reflex arc is and why we need it. The reflex arc is a pathway of neurones (nerve cells) and their connections (synapses) that doesn't go through the conscio...
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Answered by Lana B. • Biology tutor
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