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How is the structure of alveoli suitably adapted for efficient gas exchange?

Very thin walls result in a short diffusion distance which makes gas exchange particularly favourable. Lots of branches and sacs result in a large surface area so gas exchange can be maximised.
AP
Answered by Alastair P. • Biology tutor
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What are the differences between exons and introns found in DNA.

Exons are coding regions of DNA, and are copied into mRNA and transcribed as proteins. Introns are non-coding regions of DNA, and are spliced out of pre-mRNA so are not copied into mRNA.
AP
Answered by Alastair P. • Biology tutor
11827 Views

What is the difference between an aldehyde and a ketone, and what type of molecule can they each be reduced to?

Both aldehydes and ketones have a carbonyl functional group (C=O), however in aldhydes the carbonyl carbon atom is the terminal carbon of the chain, whereas in ketones the carbonyl carbon has two alkyl group...
AP
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What are the differences between covalent and ionic bonding?

Covalent bonding is the sharing of pairs of electrons between two non-metallic atoms. Ionic bonding is where electrons are transferred from one atom to another, usually from a metallic atom to a non-metallic...
AP
4142 Views

How do I solve a quadratic equation?

To solve a quadratic equation we need to find the value of x for which a x 2 +b x+c=0,where a,b,c are constants.There are some well known formulas which you should get accustomed with.However,in this answer,...
MG
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