Question: Q: What are groups of atoms that behave as a single unit called? Choices: - protons - particles - ions - molecules A:
Answer: molecules

Question: Q: Examples of what process are evident in many biological systems because cells are surrounded by semipermeable membranes? Choices: - reproduction - photosynthesis - apoptosis - osmosis A:
Answer: osmosis

Question: Q: Different shapes often correlate with different what in cells? Choices: - systems - enzymes - types - functions A:
Answer:
functions