Top answers

Biology
GCSE

Explain how smoking can increase blood pressure?

There are two main reasons that smoking can increase blood pressure:

  1. Cigarette smoke contains nicotine which, once inhaled, can enter the bloodstream and cause the release of ...
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Answered by Oliver H. Biology tutor
7336 Views

What is Evolution?

The Theory of Evolution states that organisms change (evolve) over a long time (from simple life forms) due to natural selection.

Natural Selecti...

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Answered by Dominic Y. Biology tutor
3873 Views

What is the structure of DNA?

DNA is a double helix. Consisting of two strands, which are made up of bases A T C and G

Complementary base pairing occ...

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Answered by Thomas D. Biology tutor
3424 Views

Is respiration the same thing as breathing?

No, they are not the same (although they do both involve the respiratory system!).

The key differences:Breathing is the process of moving air in and out of the lungs - like when you take a bre...

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Answered by Rhiannon L. Biology tutor
24770 Views

What are the four levels of protein structure?

Primary - The sequence of amino acids in the Protein, defined by the DNA sequence coding for the protein. 

Secondary - Any folding or coiling within the protein which are stabilised by hy...

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Answered by Theo N. Biology tutor
5372 Views

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