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1 a) What is a pathogen? 1 b) How do white blood cells help to defend the body against pathogens?

1 a) a microorganism that causes infectious disease

1 b) White blood cells:

- Ingest pathogens

- produce antibodies which destroy particular bacteria or viruses

...

LB
Answered by Lauraa B. Biology tutor
5449 Views

When do I use the subjunctive in Spanish?

There are 2 moods in Spanish: the indicative, and the subjunctive.

The indicative is used for anything that is concrete/ factual. For example: "Max habla español" (Max speaks Spanish). Th...

MB
1793 Views

25cm3 of NaOH (2M) were titrated with 1.25M H2SO4. Write down the balanced reaction equation. Calculate the number of moles of NaOH used in the titration and hence deduce the volume of sulfuric acid used in the titration. Give your answer in dm3.

2NaOH + H2SO4 -> 2H2O + Na2SO4. moles = concentration x volume. #moles NaOH = 2M x (25/1000)dm3 = 0.05 mol. The reaction equations shows the ratio of alkali to acid is 2:1. The number of moles of H2SO4...

TW
Answered by Tiffany W. Chemistry tutor
31423 Views

How to answer the question: How does a bicarbonate buffer solution control pH when either an acid or a base is added?

A buffer solution is resistant to changes in pH upon the addition of relatively small amounts of acid or base. In this case, the equilibrium resisting changes to the pH is: H2CO3 <-> H+ + HCO3-.

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HJ
Answered by Harvey J. Chemistry tutor
4000 Views

How to use properly conjunctions in a French essay?

In French we have two types of conjunctions. The coordination conjunctions link words or groups of words together using words such as: mais, où, et, donc, or, ni, car. They show union, consequences, concl...

RM
Answered by Roxane M. French tutor
2754 Views

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