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T-helper cells are a kind of lymphocyte that are a key part of the adaptive immune system. The adaptive immune system is largely coordinated by T cells, of which there are several types, and B cells, the ...

Let's have a look at a pair of brackets: (a+b)(c+d)To expand these brackets each value in one bracket must be multiplied by all values in the other bracket separately then added together. So we have: ac+a...

Deoxygenated blood from the body drains into the right atrium of the heart through the superior and inferior vena cava blood vessels. The blood then travels from the right atrium, through the tricuspid va...

DNA is a universal code for all living beings known to man. There are four nucleotide bases in DNA and RNA, the combinations of these sequences are what determine the order and length of a polypeptide. Ev...

PV=nRT V=0.8 dm³=0.8 x 10^-3 m³P= nRT/V R= 8.31 J K^-1mol^-1 T= 330 K n= mass/mr n = 15 g/ (2x35.5 g mol^-1) n = 0.212 mol P = (0.212 mol x 8....