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Alpha helices and Beta pleated sheets. 

An enzyme is a globular protein that acts as a biological catalyst.  They work by reducing the activation energy of chemical reactions, which increases the rate of reactions.

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There are 4 levels you use to describe protein structure. 

Primary Structure - This is the simplest structure of a protein. It is essentially the sequence of amino acids that form a prote...

Firstly, there are chemical differences between the two nucleic acids. DNA has the following structural properties:-double stranded and anti-parallel polymer held together by (relatively) weak hydrogen bo...

Both antigenic shift and drift are used by viruses to adapt to selection pressures and avoid host immune systems. 

Antigenic shift is a slow change in the viral genes ove...