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Explain the difference between chromatin, chromatids, chromosomes and homologous pairs.

Genetic information is stored in the nucleus as DNA. Humans have 46 molecules of DNA in each cell; each molecule known as a chromosome. When the cell is in interphase of the cell cycle, the DNA is in the chr...
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Answered by Maggie B. • Biology tutor
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Using Fick's Law, explain how rapid gaseous exchange takes place in a mammal

Gaseous exchange of oxygen and carbon dioxide (diffusion) occurs between the alveoli (tiny air sacs) and capillaries (microscopic blood vessels) inside the lung. Diffusion refers to the passive net movement ...
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Answered by Timothy C. • Biology tutor
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How does an electrical impulse travel the gap between two nerves?

The electrical impulse that travels along a nerve, known in biology as an action potential, gets passed along to an adjacent nerve as a chemical signal. When an action potential reaches the end of a nerve, i...
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Answered by Lucy M. • Biology tutor
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Describe key structural differences between prokaryotic and eukaryotic cells.

Eukaryotic cells are larger and more complex than prokaryotic cells. The eukaryotic cell contains a nucleus, which contains genetic material in the form of linear chromosomes. However, prokaryotic cells cont...
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Can lymphocytes have proteins that are complementary to host cell antigens?

You only kill off the ones that are reactive to host antigens (read: the ones that would attack your own cells!). So normal lymphocytic function isn't affected. Because of the nature of the immune system (yo...
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Answered by Scott M. • Biology tutor
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