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Biology
A Level

Starting with mRNa in the cytoplasm, describe how translation leads to the production of a polypeptide ( without including transcription or slicing)

Once the mRNA is in the cytoplasm the smaller ribosomal subunit will connect to it. It will then slide in the 5' to 3' until it reaches the initialization codon ( AUG), once this happens the TRNA that ca...

Answered by Biology tutor
11700 Views

After one molecule of oxygen has bound to Haemoglobin, it is easier for a second molecule of oxygen to bind. Explain Why?

Binding of the first molecule of oxygen changes the tertiary/quarternary structure of Haemoglobin - this can be referred to as a conformational shift. This change in structure then exposes another binding...

Answered by Alice M. Biology tutor
3210 Views

Explain the process of oxidative phosphorylation

Oxidative phosphorylation is the process by which energy in the form of ATP is produced when there is oxygen present in the cells. It occurs in the membrane of the mitochondria. Reduced NAD which is produ...

Answered by Abaan B. Biology tutor
4959 Views

What is the importance of the 'refractory period' after an action potential has been generated?

The refractory period is a period of recovery after an action potential where the ion channels will not open and the membrane can't be excited or depolar...

Answered by Biology tutor
10818 Views

Two proteins have the same number and type of amino acids but different tertiary structures. Explain why.

The order of the amino acids (primary structure) in the two proteins may be different. This can result in ionic, hydrogen and disulphide bonds to form in different locations in each protein. Such differen...

Answered by Etienne S. Biology tutor
29283 Views

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