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Enzyme inhibitors are often used as antiretroviral drugs in the treatment of HIV. Describe the structure of an enzyme and suggest how antiretroviral drugs would work in the treatment of HIV.

Enzymes are globular (globe-like) proteins, meaning they exist as 3D structures. As a protein, it is composed of a chain of amino acids which is able to fold into secondary structures such as alpha-helices a...
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Answered by Declan C. • Biology tutor
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What are genes and how do work?

Genes are the code that makes up all life on Earth. Genes are sections of the long chain-like molecule called DNA, which is found coiled up into chromosomes in the nucleus of cells. The most important part o...
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Answered by Anna D. • Biology tutor
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Consider the Matrix M (below). Find the determiannt of the matrix M by using; (a) cofactor expansion along the first row, (b) cofactor expansion along the second column

Matrix M is -2 1 -4 1 -1 5 3 0 2 Let A be a square nxn matrix. Then, for each entry Aij (where 1 </= i < n, 1 </= j < n), the minor of Aij is A(^i;^j), the determinant of the (n - 1) (n - 1) matr...
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Why do ionic compounds like NaCl conduct electricity when dissolved but not when they’re solid, whereas metals conduct electricity when they’re solid?

Firstly, it's important to recognise that ionic compounds and metals are two different structures. Ionic compounds consist of positively charged ions and negatively charged ions held together by strong elect...
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Answered by Hannah B. • Chemistry tutor
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When using cm3 as the unit for volume to calculate the concentration why must you divide the cm3 by 1000?

As I’m sure you already know, the units of concentration are mol dm -3 . So before we calculate concentrations we must convert the volume with units cm 3 to dm 3 . 1 dm is the equivalent of 10 cm . So, by cu...
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Answered by Hannah B. • Chemistry tutor
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