Origins of Cells

Why is water considered essential for the formation of life?

• It is a polar molecule that dissolves all non-polar substances.

• It acts as a medium for metabolic reactions and is necessary for forming organic molecules.

• It provides energy for all life forms.

• It protects life from UV radiation.

What is the Goldilocks Zone?

• A distance from a star where conditions allow liquid water to exist.

• A region of a planet with the highest concentration of water.

• The temperature range required for ice to form.

• A zone where all planets have atmospheres suitable for life.

Why are planets in the Goldilocks Zone not always habitable?

• They are too close to their star.

• They are often made entirely of gas.

• Their temperatures are too stable for life.

• They may lack sufficient mass or a suitable atmosphere for liquid water.

What property of water helps maintain a stable internal environment for homeostasis?

• Its ability to dissolve all substances.

• Its polarity, which allows it to form lipid bilayers.

• Its thermal properties, such as high heat capacity.

• Its ability to act as a reagent in condensation polymerization.

How did Earth's large bodies of water likely form?

• Through condensation of water vapor during Earth’s early formation.

• From comets bringing water directly to Earth's surface.

• From asteroids that contained frozen water and collided with Earth.

• Through the gravitational pull of water from other planets.

Why do non-polar fatty acids form micelles in water?

• To avoid contact between their hydrophobic tails and water.

• To maximize contact with polar water molecules.

• To help water dissolve more organic molecules.

• To allow for condensation polymerization to occur.

What happens when polar organic monomers interact with fatty acids in water?

• They prevent micelle formation.

• They repel the hydrophobic tails of fatty acids.

• They dissolve completely in water, leaving fatty acids.

• They form spherical bilayers with hydrophilic heads facing water.

What is the importance of forming membrane-bound containers (vesicles) during the origin of life?

• They create a hydrophobic barrier that enables internal chemistry to differ from the exterior.

• They facilitate the evaporation of water to support condensation reactions.

• They prevent water from interacting with organic molecules.

• They allow gravity to concentrate fatty acids.

What is the role of water in condensation polymerization?

• It acts as a solvent to dissolve fatty acids.

• It creates micelles that prevent polymerization.

• It lowers the temperature required for polymerization to occur.

• It is a reagent that facilitates the assembly of complex organic molecules.

Why did early Earth lose most of its water vapor to space?

• Water vapor was absorbed by other planets.

• The Earth’s gravity was too low to retain the vapor.

• There was not enough water vapor to form oceans.

• Temperatures were too low for water vapor to condense.