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Human Biology
A Level

State three differences between the structure of DNA and the structure of RNA

When comparing the structure of DNA and RNA (draw structure), DNA is double stranded whilst RNA is single stranded. Lets now discuss the molecular structure of DNA and RNA. DNA consists of nitrogen bases ...

Answered by Sarina R. Human Biology tutor
3393 Views

Why is there no wave for atrial repolarisation in the electrocardiogram?

While atrial repolarisation exists, you actually can't see it in the ECG! I can draw you a diagram of a normal cardiac cycle: this is the P wave, that you'll know represents the DEpolarisation of the atri...

Answered by Scott M. Human Biology tutor
5416 Views

Why is atrial repolarisation not present on an ECG yet ventricular repolarisation is?

This is because the QRS complex on the ECG (which represents the Ventricular depolarisation) is at such a high magnitude, it masks the electrical signals that occur due to atrial repolarisation as these t...

Answered by Sahil G. Human Biology tutor
2741 Views

Describe the difference between Type 1 and Type 2 Diabetes Mellitus.

The pancreas contains beta cells of the Islet of Langerhans which produces a hormone called insulin. Insulin is responsible for lowering the concentration of glucose in the blood. In type 1 diabetes, not ...

Answered by Suna M. Human Biology tutor
2842 Views

Describe how a B-cell responds the first time it is stimulated by an antigen. [3 marks]

A B-cell with a specific antigen receptor will bind to a complementary antigen, when exposed to that antigen in the body. This specific complementary binding leads to that B-cell becoming activated. An ac...

Answered by Zachary B. Human Biology tutor
12590 Views

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