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In which ways are the lungs adapted for efficient gas exchange?

There are three main ways in which the lungs are adapted for efficient gas exchange. These are: the fact that structures in the lungs called alveoli provide a large surface area for gas exchange. Also, the l...
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Answered by Holly M. • Biology tutor
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Describe the function of carrier proteins in a cell surface membrane

Carrier proteins are involved in the facilitated diffusion to move ions from a high concentration to a low concentration. They are also involved in the active transport of ions against the concentration grad...
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Answered by Jasmine B. • Biology tutor
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Describe the events that occur at synaptic junction that result in an action potential in the post synaptic membrane.

An action potential arrives at the pre synaptic membrane which initiates the opening of Ca2+ channels. The influx of Ca2+ ions will cause vesicles containing neurotransmitters to fuse with the pre-synaptic m...
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Answered by Samantha B. • Biology tutor
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What is the process of the virus HIV replication?

The HIV virus enters the body via one of the fluids through which it is transmissible e.g. blood. It then binds itself to CD4 on the body's T cells and enters the cell via endocytosis. Once it is inside the ...
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Answered by Niamh P. • Biology tutor
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What is the difference between DNA and RNA?

So, to start with what's the same, they are both molecules that are made from a nitrogenous base (Check understanding of term) and a sugar phosphate backbone. Now onto differences, DNA gets its name because ...
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Answered by Rob P. • Biology tutor
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