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Biology
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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...

KD
Answered by Katie D. Biology tutor
10032 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...

HM
Answered by Hannah M. Biology tutor
10710 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...

CT
8102 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...

MR
Answered by Maxine R. Biology tutor
2377 Views

List the differences between and eukaryotic and prokaryotic cell

Eukaryotic cell: Linear chromosomes, DNA bound to proteins (histones), DNA found within a nucleus (nucleus present), membrane bound organelles, cell wall not present in animal cells but present in plant a...

ND
Answered by Niamh D. Biology tutor
2072 Views

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