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Most cases of scarlet fever occur in children. Adults have usually developed immunity to a toxin that the Streptococcus bacteria produce during infection. Explain how an adult develops immunity.

The adult was exposed to the toxin when they were a child, this developed an immune response. This immune response stimulated B lymphocytes to proliferate, these then made memory B lymphocytes. The memory...

CB
Answered by Charles B. Biology tutor
3776 Views

Chlorine reacts with potassium bromide to form potassium chloride and bromine. In this reaction chlorine forms chloride ions: Cl2 + 2KBr --> 2KCl + Br2. Explain, using the equation, how you know that chlorine has been reduced.

It is reduced because it gains an electron in the reaction and reduction is the gain of electrons, therefore the chlorine has been reduced.

CB
Answered by Charles B. Chemistry tutor
69593 Views

Your French exchange, Marie, is coming to stay next week. Write a letter describing what she should expect from her visit.

Salut Marie, Je suis très heureuse que tu viendras la semaine prochaine. J’ai déjà organisé quelques petites choses que nous pourrions faire ensemble pendant ton séjour. J’habite à côté d’un parc où on a ...

GF
Answered by Giulia F. French tutor
2086 Views

You are visiting Italy for the first time whilst on an exchange. Write a letter to a loved one letting them know how you are getting on.

Ciao mamma,Saluti da Roma! Mi sto divertendo molto con il mio studente di scambio. Ieri abbiamo visitato il Colosseo, era veramente interessante e ho imparato molto. Per esempio, non sapevo che nei vecchi...

GF
Answered by Giulia F. Italian tutor
2176 Views

Prove that 0.5757... (recurring) = 19/33. Hence, write 0.3575757... (recurring) as a fraction in its lowest terms.

Two parts to the question. Let's focus on part one:Let x = 0.575757... (1)This means that 100x = 57.575757... (2)If you subtract (1) from (2), we get: 99x = 57Divide both sides by 99: x = 57/99Simplify: x...

OV
Answered by Oliver V. Maths tutor
7680 Views

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