Top answers

Biology
A Level

How may nitrate from fertiliser entering lakes cause the death of fish in fresh water?

The addition of excess nitrate to the freshwater body causes algal bloom on the surface, blocking sunlight. This reduces the photosynthetic activity of submerged plants, causing them to die. Subsequently,...

CM
Answered by Cocoa M. Biology tutor
2225 Views

Explain the structure of an amino acid and how a peptide bond forms between two amino acids.

An amino acid is made up of four groups bonded to a central carbon atom. These groups include a hydrogen atom, a carboxyl group, an amine group and a R group. The R group differs for each amino acid. A pe...

HT
Answered by Hazal T. Biology tutor
13926 Views

Explain how a mutation in the gene coding for an enzyme could lead to the production of a non-functional enzyme.

The base sequence changes so the amino acid sequence changes therefore leading to a change in the types and location of bond formation thus a change in the tertiary structure occurs. This prevents the enz...

Answered by Biology tutor
5746 Views

Describe how the products of the Light dependent stage of photosynthesis are used in the Calvin cycle (3marks)

Reduced NADP is used to reduce GP to TP. The ATP provides the energy needed for the reduction of the aforementioned reaction. It also provides a phosphate ion to regenerate RuBP from TP.

BC
Answered by Bill C. Biology tutor
2854 Views

Explain the Bohr shift.

The Bohr shift should be explained using the relative affinities of haemoglobin to carbon dioxide and oxygen due to changes in pH level. When pCO2 is high in cells (i.e in muscle cells when one is exercis...

LL
Answered by Lucas L. Biology tutor
4048 Views

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