Top answers

How is a sperm cell adapted to it's role?

The role of the sperm cell is to fertilise the egg. It is adapted to fulfill this role in four main ways. Firstly it has a tail to help it travel to the egg. Secondly it contains the nucleus in the head that...
RO
Answered by Rhys O. • Biology tutor
68082 Views

What is the difference between a eukaryotic cell and a prokaryotic cell?

Eukaryotic cells include plant and animal cells. They have a cell membrane, cytoplasm and their genetic DNA is encased in a nucleus. Prokaryotic cells (bacteria) are much smaller in comparison. They have cyt...
IC
Answered by Isabel C. • Biology tutor
3712 Views

How and why are bacteria used in industry?

Bacteria are used in industry to produce enzymes and other proteins. Because they are prokaryotes and don't have a nucleus, every DNA plasmid that is taken up is translated. You just have to insert the plasm...
NW
Answered by Niclas W. • Biology tutor
4077 Views

Describe the basic principles of cell theory giving examples to support them

The cell is the smallest unit of life. Organelles cannot survive by themselves.Challenge to the theory: green algae - highly complex mono-nucleated cell that is up to 10cm. All cells come from pre-existing c...
KV
2180 Views

What is the 'lock and key' hypothesis?

A reaction can only be catalysed (sped up) if an enzyme's active site matches the shape of its substrate molecules- the substrate fits into the active site like a key into a lock. This shape is highly specif...
EE
Answered by Emily E. • Biology tutor
3258 Views