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Each amino acid contains a different R group specific to the amino acid. Describe how the R group of an amino acid contributes to the tertiary structure of a protein. (4 marks)

Cysteine contains an S atom in its R group. Where 2 molecules of cysteine are found together, strong covalent bonds or "disulfide bridges" can form between the two S atoms (S=S). R groups may have ...
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Answered by Jake G. • Biology tutor
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Describe the process of aerobic respiration.

Respiration is the process by which cells make energy. Aerobic respiration uses oxygen to make energy. Respiration involves a series of reactions. The overall equation for the reaction is:Oxygen + Glucose —&...
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Answered by Madlen H. • Biology tutor
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Describe the process of evolution by natural selection as developed by Charles Darwin in the 1800s.

Evolution by natural selection occurs when random mutations in the genome of an organism causes phenotypic traits (observable characteristics or traits) to be different between individuals of an organism. Th...
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Answered by Jack W. • Biology tutor
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Find the coordinates of the points where the lines y=x^2-5x+6 and y=x-4 intersect.

At the points of intersection the x and y coordinates will be the same. So we can solve the equations simultaneously to see what solutions to x and y solve both equations.Rearrange the second equation to get...
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Answered by Georgia C. • Maths tutor
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what does it mean if "b^2 - 4ac < 0" for a quadratic equation (eg y = a*x^2 + b*x + c)

The question comes from the quadratic equation r = (-b +- sqrt(b 2 - 4ac)/2a where r is the root or x coordinate where the line crosses the x-axsis (the y coordinate is always 0). If b 2 - 4ac &lt; 0 then to...
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Answered by Nick W. • Maths tutor
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