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Describe how a B-cell responds the first time it is stimulated by an antigen. [3 marks]

A B-cell with a specific antigen receptor will bind to a complementary antigen, when exposed to that antigen in the body. This specific complementary binding leads to that B-cell becoming activated. An ac...

ZB
13000 Views

Describe how σ and π bonds form.

Sigma bonds form as a result of end on overlap of orbitals (pp, ss or sp) along the axis between two atoms' nuclei. Pi bonds form because of parallel overlap between p orbitals. A sigma bond forms a singl...

EJ
Answered by Eloise J. Chemistry tutor
6193 Views

Explain why the 2nd Electron aiffinity of Chlorine is Endothermic whilst the first electron affinity is exothermic

With the first electron affinity, the chlorine atom is one electron from a full octet ( and is a neutral species). When you add an electron to the chlorine, the negatively charged electron is electrostati...

HC
Answered by Hayden C. Chemistry tutor
8833 Views

Suggest why Phenol is more reactive than Benzene in Electrophillic Substitution

With phenol, the oxygen atom is directly attached to the delocolised pi system in phenol, as a result the lone pair on this oxygen is incorporated into this delocolised pi system in phenol, increasing it'...

HC
Answered by Hayden C. Chemistry tutor
2074 Views

Explain quantitatively how an object can follow circular motion whilst on a ramp with no friction in the radial direction.

The important condition for circular motion is that there must be a constant force acting perpendicular to the motion of the object. In this case there will be a contact force acting on the object from th...

JR
Answered by James R. Physics tutor
2083 Views

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