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Give 3 main differences between RNA and DNA.

DNA is double stranded while RNA is a single stranded polynucleotide chain. In DNA the pentose sugar is deoxyribose (one less oxygen containing hydroxyl group) and in RNA it is ribose. In DNA the four bases ...
DL
Answered by Dora L. • Biology tutor
2946 Views

Describe how a change in temperature affects enzyme activity.

Enzymes are substrate specific proteins which act as biological catalysts and as temperature increases, we see an increase in enzyme activity. This occurs because an increase in temperature causes molecules ...
FH
Answered by Freya H. • Biology tutor
7090 Views

Describe how the structures involved in a reflex action help co-ordinate a reflex: (image with receptor, effector, spinal cord, synapse and neurones)

A receptor detects a stimulus e.g. pressure. The receptor generates electrical signals. Neurones conduct impulses, a sensory neurone conducts to the spinal cord. There is a synapse between the neurones and t...
PA
Answered by Pareya A. • Biology tutor
4520 Views

What is the process of gas exchange in the alveoli?

So as we know, the job of the lungs is to transfer oxygen from the outside atmosphere into the body while also removing waste products that the body has produced and needs to get rid of- carbon dioxide. The ...
MA
Answered by Mohammad A. • Biology tutor
6189 Views

Below is a diagram of a sperm cell. Describe how the long tail and mitochondria aid in the sperms function (2 marks)

1- The long tail helps the sperm to swim towards the egg. Also makes the sperm more streamlined to get to the egg quicker. 2- The mitochondria release energy which enable the sperm to swim towards the egg.
YB
Answered by Yazmin B. • Biology tutor
14027 Views