QuestionSBA
QuestionChoice
Although it may be found in small proportions in collagen molecules, methionine does not contribute to the tight twists of collagen molecules. Methionine's R-group consists of a 2-carbon alkyl chain linked to a sulphur molecule which is itself linked to a methyl group.
10001094
d
Methionine
QuestionChoice
Although it may be found in small proportions in collagen molecules, isoleucine does not contribute to the tight twists of collagen molecules. Isoleucine's R-group consists of a 3-carbon alkyl chain with a methyl group branching off the 1st carbon of the chain.
10001092
b
Isoleucine
QuestionChoice
Collagen is formed mainly of repeats of glycine, proline and hydroxyproline. Proline's variable R-group consists of a 3-carbon acyl chain, the terminal carbon of which is linked to the nitrogen atom in the amine group. This causes a tight bend in amino acid chains in which proline is present.
10001091
a
Proline
QuestionChoice
Although it may be found in small proportions in collagen molecules, phenylalanine does not contribute to the tight twists of collagen molecules. Phenylalanine's R-group consists of a single carbon alkyl group linked to a benzene ring.

<br>
10001095
e
Phenylalanine
QuestionChoice
Although it may be found in small proportions in collagen molecules, lysine does not contribute to the tight twists of collagen molecules. Lysine's R-group consists of a 4-carbon alkyl chain with an amine group linked to the 4th carbon of the chain.
10001093
c
Lysine
Concept
Chapter
2693
3882
Collagen
Topic
181
Structure and Function of Cells
12765
The unique structure of which amino acid allows tight twists in the structure of collagen molecules?
a