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By multiplying everything in equation 2 by 2, you get 2x + 8y = 34. If you then subtract equation 1 from this you get 5y = 15. Thus y = 3, going back to equation two, and subbing y back in, x + 12 = 17, t...

HIV is a retrovirus that infects specifically T helper cells / CD4 cells in the body.the glycoprotein (envelope protein) on the surface of the virus is able to bind to receptors on CD4 cells, and causes t...

First differentiate 2x² - 5x - 3 to get 4x -5. At x = 3, the gradient of the tangent must be 7, and we know it goes through (3, 0) Plug the values into y = mx + c to get the equation of the lin...

complementary base pairing - new strand can be synthesised based on the base sequence on the template strand, so that the resulting strand synthesised is identical to the coding strand.
hydrogen bon...

7/2x² + 4/3x = 21/6x² + 8x/6x² = ( 8x + 21 ) / ( 6x² )