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Biology
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How can molecules cross a cell membrane?

Semi-permeable membranes in the cell will let some molecules through but not others. There are three main ways in which these molecules can move. 1) Active transportAs the name suggests, here, molecules a...

JR
2296 Views

Describe the process of phagocytosis

When a phagocyte recognises the antigens on a pathogen, it engulfs the pathogen. The pathogen becomes contained in a phagocytic vacuole. A lysosome fuses with the phagocytic vacuole and digestive enzymes ...

HL
Answered by Heather L. Biology tutor
2550 Views

What does it mean if genes are linked?

Linked genes are genes found on the same chromosome. Chromosomes are distinct 'sections' of DNA, and each gene in an organism has its own place on a chromosome. When genes are linked, it means that allele...

FC
Answered by Flat C. Biology tutor
3713 Views

What is the main function of the Schwann cell?

Schwann cells are found wrapped along the axons of some of the neurones of the peripheral nervous system (PNS).They secrete a lipid-based substance known...

IM
Answered by Isaac M. Biology tutor
6826 Views

What are the fundamental differences between a cell membrane and a cell wall?

Both encase different type of cells however their compositions are distinct and because of this they have different functions and distributions across cell types. 
Structure and composition

JM
3842 Views

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