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Explain the trend in ionisation energy down group 2? (3)

• down group 2 the number of protons increases therefore the nuclear charge increases (protons are found in the nucelus and have a +1 charge) • the number of shielding electrons increases ( each member down ...
FJ
Answered by Flora J. • Chemistry tutor
14551 Views

Explain the principles of PCR

The Polymerase Chain Reaction (PCR) is a method of DNA amplification in vitro. It consists of 3 stages - denaturation, annealing and extending. PCR relies on the use of a thermophilic Taq polymerase enzyme.
DB
Answered by David B. • Biology tutor
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State the differences between introns and exons.

Introns and exons are parts of genes - exons code for proteins, whereas introns do not, ie: exons are converted into messenger RNA to allow these parts of the gene to then be transcribed into protein. Intron...
DB
Answered by David B. • Biology tutor
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What is the difference between "ser feliz" and "estar feliz"?

Ser feliz means that the person is always happy whereas estar feliz means the person is happy today.
IM
Answered by Ignacio M. • Spanish tutor
22615 Views

Please explain Pythgoras Theorem

So, Pythgoras Theorem mostly deals with right-angled triangles, ie a triangle with one 90 degree angle. The slanted side is called the hypotenuse and let us denote it as c the bottom is called the adjacent, ...
MA
Answered by Mary A. • Maths tutor
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