Multiple Choice
Which element accounts for about 20 percent of a human’s total body mass?
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4. Biomolecules
Carbon
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Which of the following best describes the primary role of carbon in biological systems?
A
It forms the backbone of organic molecules, allowing for the diversity of life’s macromolecules.
B
It acts as the main energy currency in cells.
C
It serves as a universal solvent for biochemical reactions.
D
It is the primary component of cell membranes.
Verified step by step guidance1
Understand the role of carbon in biological systems: Carbon is a fundamental element in organic chemistry and biology because of its ability to form four covalent bonds, allowing it to create complex and diverse molecules.
Recognize that organic molecules, such as carbohydrates, lipids, proteins, and nucleic acids, are all built upon carbon backbones. This structural versatility is key to the diversity of macromolecules in living organisms.
Eliminate incorrect options: Carbon is not the main energy currency in cells (this role is fulfilled by ATP), nor is it a universal solvent (water serves this function). Additionally, while carbon is present in cell membranes, it is not the primary component; lipids and proteins are.
Focus on the correct option: The primary role of carbon is to form the backbone of organic molecules, enabling the complexity and diversity necessary for life.
Conclude that the correct answer is: 'It forms the backbone of organic molecules, allowing for the diversity of life’s macromolecules.'
