This week, Emma's got the lowdown on facilitated diffusion and polarized membranes for your AP Bio exam. She looks at how molecules diffuse through carrier proteins or channel proteins in membranes. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

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Join Emma this week as she looks at osmosis for your High School Bio exam. She goes through the diffusion of water across a partially permeable membrane and the effect of this process on the shape of plant cells. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

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In this episode, Emma looks at diffusion and active transport for your High School Bio exam. She goes through the difference between diffusion and active transport and gives examples of each. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

In this episode, Emma looks at gas exchange in the human body for your A level Biology exam. She goes through the structure of the lungs and how each part is adapted to its function, including the alveoli, the bronchi and bronchioles. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

This week, Emma looks at the control of water loss for your A level Biology exam. She goes into xerophytic plants and their adaptations to desert habitats in order to control the loss of water. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

In this episode, Emma looks at gas exchange in plants, fish and insects for your A level Biology exam. She looks at adaptations such as the spiracles of insects and stomata of plant leaves. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

Emma's back with everything you need to know about substance exchange in organisms for your A Level Biology exam. She goes through the important concept of surface area to volume ratio, as well as gas exchange in single-celled organisms. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

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Emma looks at the structure of the HIV virus, and the effect it has on an infected human. She also looks at the onset and symptoms of AIDs, as well as potential research routes for prevention and treatment. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

Emma looks at the primary and secondary immune response and the theory behind vaccines. She also looks at the principle of herd immunity. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

In this episode, Emma takes us through the role of monoclonal antibodies in the human immune system. She looks at the structure of antibodies (variable regions, constant regions and disulphide bridges), as well as the enzyme-linked immunosorbent assay or ELISA test. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8

Emma looks at the process of phagocytosis in dealing with pathogens. She looks at the role of T cytotoxic and T helper cells. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8