The image below shows aspects of the secondary structure of an important human protein.

Two specific amino acids are highlighted by a ball and stick representation.

(Note that atoms are coloured by element, where blue is nitrogen, red is oxygen and yellow is sulphur.)

Complete the statement regarding the role of these two amino acids:

This is an example of...

The image below shows aspects of the secondary structure of an important human protein.

Several amino acids are highlighted by a ball and stick representation.

(Note that atoms are coloured by element, where blue is nitrogen and red is oxygen.)

Which statement below describes the numbered region?

The image below shows aspects of the secondary structure of an important human protein.

Several amino acids are highlighted by a ball and stick representation. A number of non-covalent interactions are also shown.

(Note that atoms are coloured by element, where blue is nitrogen and red is oxygen.)

Which ONE statement below is true?

The image below shows part of the cartoon structure of an important human protein.

Three amino acids have been highlighted in a ball and stick representation. Note that atoms are coloured by elements, where nitrogen is blue, oxygen is red and sulphur is yellow.

In the box below, enter the sequence of the highlighted three amino acids in the correct sequence direction of N- to C-terminal according to the protein structure shown.

Your answer must be in the single amino acid code. For example, if you think the sequence is alanine glycine serine, then enter: AGS. Use the provided amino acid figure to help you.

The image below shows part of the cartoon structure of an important human protein heterodimer.

Three amino acids have been highlighted in a ball and stick representation. Note that atoms are coloured by elements, where nitrogen is blue and oxygen is red.

In the box below, enter the sequence of the highlighted three amino acids in the correct sequence direction of N- to C-terminal according to the protein structure shown.

Your answer must be in the single amino acid code. For example, if you think the sequence is alanine glycine serine, then enter: AGS. Use the provided amino acid figure to help you.

The image below shows part of the cartoon structure of an important human protein.

Three amino acids have been highlighted in a ball and stick representation. Note that atoms are coloured by elements, where nitrogen is blue, oxygen is red and sulphur is yellow.

In the box below, enter the sequence of the highlighted three amino acids in the correct sequence direction of N- to C-terminal according to the protein structure shown.

Your answer must be in the single amino acid code. For example, if you think the sequence is alanine glycine serine, then enter: AGS. Use the provided amino acid figure to help you.

The image below shows part of the cartoon structure of an important human protein.

Three amino acids have been highlighted in a ball and stick representation. Note that atoms are coloured by elements, where nitrogen is blue, oxygen is red and sulphur is yellow.

In the box below, enter the sequence of the highlighted three amino acids in the correct sequence direction of N- to C-terminal according to the protein structure shown.

Your answer must be in the single amino acid code. For example, if you think the sequence is alanine glycine serine, then enter: AGS. Use the provided amino acid figure to help you.

Compare the two DNA duplexes shown below.

Duplex 1                  Duplex 2

5′-ACTCTACACCAG-3′        5′-TGGATTGGTC-3′

3′-TGAGATGTGGTC-5′        3′-ACCTAACCAG-5′

Which of the following statement(s) is/are correct?

Which of the following statements correctly identifies a hydrogen bond donor and a hydrogen bond acceptor in the base pair structure shown below?

One strand of a DNA duplex has the sequence:

5′-CAAAGTCAGT-3′

Type the sequence of the complementary strand in the 5′ to 3′ direction.

Be careful not to type any spaces or additional characters. For example, if you think the answer is 5'-AGCC-3', simply type AGCC.