Search our library of Biology A Level questions

Top answers

Biology

A Level

What is the structure of DNA?

DNA (DeoxyriboNucleic Acid) is a polymer (a molecule made up of many repeated subunits which form a chain). The subunit of DNA is a DNA nucleotide.

Answered by Hannah T. • Biology tutor

8736 Views

What happens in the light independent reactions of photosynthesis?

The light-dependent reactions (LDR) take place in the stroma. It is also referred to as the Calvin Cycle.

CO2 and RUBP combine, using the enzyme RUBISCO. This forms an unstable 6C carbon-...

Answered by Tzeamara G. • Biology tutor

13575 Views

What is the difference between mRNA and tRNA?

RNA stands for riboncleic acid. mRNA is messenger RNA. This type of RNA is a linear polymer involed in a part of protein symthesis called transcription. It allows the DNA code to be taken outside the n...

Answered by Sophia L. • Biology tutor

13215 Views

What properties does water possess that make it an essential molecule for life?

· Solvent – Good for polar substances (salts, sugars, simple alcohols)

· Heat Capacity – Energy to raise 1kg water by 1^oK. Keeps blood temperature stable

Answered by Connor B. • Biology tutor

4213 Views

"Describe the process of Aerobic Respiration"

Aerobic respiration is a process that releases energy from a respiratory substrate (e.g. glucose) by fully oxidising it. Energy is released in the form of ATP; Carbon dioxide and Water are released as ...

Answered by Firat G. • Biology tutor

10548 Views