Shown below are three short DNA duplexes.

What is the correct order of stability of these duplexes (from most stable to least stable)

[Note: You do not need to calculate T_m values. You should be able to determine the order of stability “by eye”.]

The image below is a helical wheel representation of part of an alpha helix (top-down view), with each amino acid a numbered circle.

Without knowledge of any R groups, non-covalent interactions between which ONE of the following pairs of amino acids will likely help stabilise the helix?

How many peptide bonds are there in the following peptide sequence?

MetCysGlySerProLeu

(Enter a number in digits with no additional characters)

Why is glycine (shown below) the only non-chiral amino acid?

A key characteristic of the alpha helix is:

Fibrous proteins typically have a tertiary structure that:

Quaternary structures:

A protein structure was elucidated and found to contain a specific pattern of alpha helices and beta sheets previously observed in many different proteins. This is an example of: 

The image below is a helical wheel representation of part of an alpha helix (top-down view), with each amino acid a numbered circle.

Without knowledge of any R groups, non-covalent interactions between which ONE of the following pairs of amino acids will likely help stabilise the helix?

How many peptide bonds are there in the following peptide sequence?

MPGA

(Enter a number in digits with no additional characters)