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Can you please explain the lock and key model of enzyme action to me?

Okay, so let's get back to basics. What is an enzyme? An enzyme is a biological catalyst that speeds up chemical reactions. How does it do this? All enzymes have active sites, which is where certain molecule...
ET
Answered by Eva T. • Biology tutor
9225 Views

Why is the resting membrane potential of a neurone negative when there are positive ions inside the cell?

The resting membrane potential inside the neurone (-70mV) is negative relative the outside! This means that even though there are both Na + and K + ions inside the cell, there are fewer of them (-70mV fewer)...
CS
Answered by Chloe S. • Biology tutor
5174 Views

Describe how a protein molecule is produced from mRNA

Translation is the conversion of the messenger RNA (mRNA) code into a protein. Cytoplasmic mRNA is bound by ribosomes (which are present in the cytoplasm or rough endoplasmic reticulum). Transfer RNA (tRNA) ...
JN
Answered by James N. • Biology tutor
5243 Views

What happens during an action potential?

Action potentials are how nerve impulses travel along nerve cells/neurones. At rest a neurone has a membrane potential of -70mV which is maintained by the action of sodium potassium pumps in the plasma membr...
EB
Answered by Emily B. • Biology tutor
8773 Views

How does antibiotic resistance arise and how can resistance spread?

i. How does antibiotic resistance arise? antibiotic resistance = bacteria that cannot be treated with antibiotics resistance arises when bacterial genes mutate (=a change in base sequence of DNA) - leads to ...
KA
Answered by Keemia A. • Biology tutor
3685 Views