Multiple Choice
Which of the following functional groups is responsible for the yellow-orange pigment in skin known as carotenoids?
2. Molecular Representations
Functional Groups
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Which functional group is commonly found in lipopolysaccharides (LPS) of bacterial cells?
A
Phosphate group
B
Carboxyl group
C
Hydroxyl group
D
Amino group
Verified step by step guidance1
Understand the context: Lipopolysaccharides (LPS) are large molecules found in the outer membrane of Gram-negative bacteria, playing a crucial role in the structural integrity of the bacteria and in protecting the membrane from certain kinds of chemical attack.
Identify the functional groups: LPS molecules are composed of a lipid component and a polysaccharide component. The lipid component, known as lipid A, is responsible for the toxic effects of LPS.
Consider the role of functional groups: The phosphate group is a key component of the lipid A portion of LPS, contributing to its negative charge and its ability to interact with other molecules.
Review the options: The options provided are phosphate group, carboxyl group, hydroxyl group, and amino group. Each of these groups has distinct chemical properties and roles in biological molecules.
Determine the correct functional group: Given the role of the phosphate group in the structure and function of LPS, it is the functional group commonly found in lipopolysaccharides of bacterial cells.
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