Search our library of Biology questions

Top answers

Biology

All levels

What is the difference between haploid and diploid cells? (2 Marks)

Diploid cells contain 2 sets of chromosomes (23 pairs of chromosomes) e.g. body cells. Haploid cells contain half the amount of chromosomes as diploid cells (only

Answered by Katie D. • Biology tutor

24017 Views

Describe how a sperm cell is adapted to its role (4 marks).

The role of a sperm cell is to fertilise an egg cell and pass on genetic material. The nucleus of the sperm cell contains the male genetic material/DNA. The head of the sperm cell contains many mitochondr...

Answered by Katie D. • Biology tutor

12081 Views

Describe the stages of the mitotic cell cycle, explaining the appearance of cells at each stage.

The cell cycle can be broken into two. When the cell is replicating its DNA and preparing for division, it is in interphase. Interphase cells have a nucleus with chromosomes arranged as c...

Answered by Hannah M. • Biology tutor

12530 Views

Outline the role and organisation of the autonomic nervous system in mammals

The are two main areas of the autonomic nervous system are the sympathetic and the parasympathetic nervous systems. These are contrasting pathways and their main function is to regulate internal organ f...

Answered by Christopher T. • Biology tutor

9294 Views

When a new antigen is presented to the immune system, an immune response leads to antibodies are released. The second time this happens it is much faster - explain why

In the primary immune response, there is antigen presentation followed by clonal selection, expansion and differentiation of helper t cells. This leads to plasma cells releasing antibodies and the develop...

Answered by Maxine R. • Biology tutor

3303 Views