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Biology

A Level

Give TWO similarities in the movement of substances by diffusion and by osmosis.

(Movement) down a gradient / from high concentration to low concentration; 2. Passive / not active processes; OR Do not use energy from respiration / from ATP / from metabolism; OR Use energy from ...

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Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of a cell.

mRNA is messenger RNA which carries information from the genome to be translated into proteins. The DNA is transcribed into mRNA in the nucleus. DNA helicase breaks the hydrogen bonds of DNA into sense an...

Answered by Ryley C. • Biology tutor

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Compare the mammalian heart to that of an amphibian. Use a diagram.

Four mark question Can use drawn example to show the comparison of a three chambered heart to that of a four chambered heart.(2)Name the different parts of the heart. Mammalian is two atria, two ventricle...

Answered by Sophie A. • Biology tutor

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Describe the process of mitosis

The cell is initially in interphase, where the organelles double, DNA replicates and protein synthesis occurs.Prophase: Chromosomes condense, mitotic spindle begins to form, the nuclear envelope breaks do...

Answered by Daninielle H. • Biology tutor

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What are the four stages of mitosis and what characteristic events occur within the cell at each stage?

Mitosis is the division of one cells contents to either side of the cell in preparation for cytokinesis which is the splitting of one cell into two identical, diploid, daughter cells. The four stages of m...

Answered by Olivia G. • Biology tutor

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