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Describe the structure of proteins.

Proteins are made up of chains of amino acids. Amino acids are made up of a central carbon atom, joined to one hydrogen atom, an amine group (NH2), a carboxyl group (COOH) and an R group. The R group varies ...
SL
Answered by Suzi L. • Biology tutor
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What are proteins?

Proteins are polymers made of amino acids. Proteins are essential molecules. Among many other roles, they can catalyse numerous reactions within the body (these proteins are known as enzymes), they allow cel...
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Answered by Suzi L. • Biology tutor
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What is the difference between form and content and how do they relate to one another?

Content is what a text says. Form is the way in which what it says is arranged. Everything from a chapter to a paragraph to a punctuation mark is a way of arranging the content of a text, and thus a formal q...
BC
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How does the release of calcium ions regulate muscle contraction?

Tropomyosin is a protein that covers the actin binding site. This prevents a cross-bridge forming between the myosin and actin filaments whilst the muscle is at rest. Calcium ions bind to troponin molecules,...
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Answered by Emily T. • Biology tutor
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Which variation of 'to' (en, au, aux, à) should be used when describing 'going to' a country which is in masculine, feminine and/or in plural form?

In some cases, the preposition ‘à’ is used to signify going ‘to’ a place in a sentence. However, sometimes this preposition takes on different forms or changes entirely based on the gender of the noun which ...
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Answered by Olena S. • French tutor
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