Top answers

Biology
A Level

What causes the condition Cystic Fibrosis?

Cystic Fibrosis is caused by a mutation in the CFTR gene. The mutation causes a small change in the DNA's base sequence which codes for a different sequence of amino acids and therefore as a result, th...

YM
Answered by Yasmin M. Biology tutor
5338 Views

How do plant stomata open and close?

Stomata can be thought of as gates. This is why the size of the guard cells is so important. How the guard cells change in size is a simple matter of how much fluid they can hold - their turgor. Osmosi...

SM
Answered by Sarah M. Biology tutor
48922 Views

Describe how antibiotic resistance occurs.

Firstly, antibiotic resistance has to be gained by a bacterium through the mutation of a gene. This can occur due to, for example, the overuse of antibiotics or failure to complete a full course of ant...

AH
Answered by Anita H. Biology tutor
18670 Views

What are the differences between facilitated diffusion and active transport?

Facilitated diffusion doesn't require ATP whereas active transport does. This is because active transport involves the movement of particles against its concentration gradient, whereas facilitated diffusi...

UT
Answered by Upasana T. Biology tutor
15879 Views

How would you explain oxidative phosphorylation and chemiosmosis?

Reduced coenzymes produced in the Krebs cycle; glycolysis and Link Reaction (Reduced NAD and FAD) carry Hydrogen ions and electrons to the inner mitochondrial membrane , within the membrane are a numbe...

JB
Answered by Joseph B. Biology tutor
4398 Views

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