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Explain the Cardiac Cycle

Deoxygenated blood from the body drains into the right atrium of the heart through the superior and inferior vena cava blood vessels. The blood then travels from the right atrium, through the tricuspid valve...
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Answered by Simi P. • Biology tutor
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Mutations of a DNA sequence could alter the expression of a gene. Describe and explain the process of gene expression and how a mutation could lead to disease.

DNA is a universal code for all living beings known to man. There are four nucleotide bases in DNA and RNA, the combinations of these sequences are what determine the order and length of a polypeptide. Every...
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Answered by Omar S. • Biology tutor
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How can natural selection and isolation lead to speciation?

What is speciation?When a new and distinct species evolves from an ancestor speciesReproductively isolated from the ancestor/other species2. How does natural selection work?a. Population of individuals, with...
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Answered by Laura P. • Biology tutor
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State the functions of five organelles in animal cells

Nucleus- controls the activity of the cellMitochondria- site of aerobic respirationCytoplasm- site of biochemical reactions, including anaerobic respiration Cell membrane- Allows transport of materials into ...
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How are red blood cells adapted to carrying oxygen

Biconcave discs- to increase surface area for oxygen carriage Haemoglobin- increases affinity for oxygen uptake at the lungs. However, at the respiring tissues, the increased CO2 concentration allow release ...
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