Which Pairing of Occurrence and Date Is NOT Correct

question 24

Multiple Choice

Which pairing of occurrence and date is NOT correct?

• A)origin of invertebrates-630 million years ago
• B)origin of life-4.6 billion years ago
• C)origin of eukaryotic cells-2.1 billion years ago
• D)origin of prokaryotic cells-3.5 billion years ago
• E)chordate evolution-545 million years ago

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Definitions:

Concentration Differences

The variance in the amount of a substance in different areas, leading to diffusion from high to low concentration.

Plasma Membrane

The semipermeable membrane surrounding the cytoplasm of a cell, composed of a phospholipid bilayer with embedded proteins.

Concentration Differences

Variations in the amount of a particular substance within a given volume, leading to a gradient that can cause diffusion.

Sodium-Potassium Pump

A membrane-bound ATPase enzyme that pumps sodium out of cells while moving potassium into cells, crucial for maintaining cellular ion balance and membrane potential.