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Biology
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How is immunity developed after a primary infection by bacteria?

Phagocytosis - A phagocyte detects the bacteria has foreign antigens and so envelops it with its cytoplasm, packaging it into a phagosome via endocytosis. Lysosomes then fuse with the phagosome releasing ...

Answered by Daniel V. Biology tutor
2145 Views

In some parts of Africa, where malaria commonly occurs, there are higher frequencies of the allele that causes sickle-cell anaemia.

Individuals with the recessive sickle-cell anaemia allele have a lower chance of developing severe malaria. Therefore, they are more likely to survive and reproduce than those without the allele. The alle...

Answered by Laura N. Biology tutor
2088 Views

Describe the differences between active transport and facilitated diffusion.

Facilitated diffusion is a passive process that occurs down a concentration gradient. Active transport requires energy (from ATP) to allow movement of substances against a concentration gradient.

Answered by Laura N. Biology tutor
2785 Views

What is the definition of osmosis?

Osmosis is the process describing the random movement of water molecules through a permeable membrane from an area of high water concentration to an area of low water concentration until equilibrium is re...

Answered by Finlay M. Biology tutor
2993 Views

Explain how mRNA is formed. (6 marks)

DNA helicase breaks the hydrogen bonds between the base pairs in the double-stranded DNA. RNA nucleotides then line up beside their corresponding nitrogenous base (A-T, C-G) along the template strand of t...

Answered by Laura N. Biology tutor
6978 Views

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