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Describe, with the aid of diagrams, what hydrogen bonding is in water.

Hydrogen bonding is a strong dipole-dipole attraction between a lone pair of electrons on a highly electronegative atom, such as oxygen or nitrogen, and a hydrogen atom on another molecule. In the case of wa...
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Answered by Anna H. • Chemistry tutor
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What are antibodies and how do they work?

Antibodies are proteins which belong to a class known as immunoglobulins. They are made up of chains of amino acids joined by peptide bonds. Antibodies have an important role in the immune system of many ani...
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Answered by Anna H. • Biology tutor
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Find values of x for which 2x^2 < 5x + 12

Start by rearranging the inequality - make sure the sign next to the x 2 term is positive to make it easier: 2x 2 -5x - 12&lt; 0 Next step is to factorise this quadratic. To do this, remember that the genera...
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Answered by Sean B. • Maths tutor
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How does water enter and move up the plant?

It moves up through a process known as transpiration . This is when water leaves the through the stomata , creating a negative hydrostatic pressure which pulls the water up through the xylem . The properties...
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Answered by Emily P. • Biology tutor
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Differentiate y=(x^2+1)(e^-x)

Here, we're using the product rule (and the chain rule for the e -x ): y=(x 2 +1)(e -x ) dy/dx=(2x)(e -x )+(x 2 +1)(-1)(e -x ) Then we simplify to get: dy/dx=(e -x )(2x-x 2 -1)
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Answered by Rishav D. • Maths tutor
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