Biomolecules and Ecosystem Interactions

Which biomolecule provides the quickest source of energy for cellular activities?

• Lipids

• Proteins

• Nucleic acids

• Carbohydrates

Which of the following correctly matches a biomolecule with its function in the cell?

• Lipids – Store genetic information

• Proteins – Act as enzymes to speed up reactions

• Nucleic acids – Provide immediate energy for the cell

• Carbohydrates – Make up the phospholipid bilayer of the cell membrane

What is the function of lipids in the structure of the cell membrane?

• They form a flexible barrier that regulates what enters and exits the cell.

• They store genetic information to pass on traits.

• They act as enzymes to speed up chemical reactions.

• They transport oxygen in the bloodstream.

A scientist observes a molecule composed of amino acids. What is the most likely function of this molecule?

• Storing long-term energy

• Speeding up a chemical reaction

• Storing genetic material

• Forming the outer membrane of a cell

In a food web, what role do decomposers play in maintaining ecosystem stability?

• They convert solar energy into chemical energy.

• They recycle nutrients back into the environment for producers to use.

• They prevent herbivores from overpopulating.

• They increase oxygen levels in the atmosphere.

Which statement best explains why biodiversity is essential for a stable ecosystem?

• It prevents predators from disrupting the food web.

• It ensures that energy is lost at each trophic level.

• It allows for a variety of organisms to fulfill ecological roles, promoting resilience.

• It increases the population size of decomposers in the ecosystem.