Page 75 - Science Course 1 (Book 1)

Mo3-L2: Key Concept Check

Directions: Put a check mark on the line before each item that helped scientists develop the cell theory

1. building the first telescopes
2. building the first microscopes

3. making more advanced microscopes
4. the invention of the electron microscope
5. comparing plant and animal cells

6. discovering protists

Directions: Explain why each statement below is false according to the cell theory.
7. A one-celled organism is not a living thing.

8. The smallest living unit is the atom.

9. Viruses are not cells, but they are alive.

10. Plants do not come from cells; they come from seeds.

Mo3-L1: Lesson Review Quiz (Multiple Choice)

Directions: On the line before each question, write the letter of the correct answer.

1. Which substances are macromolecules?
A. sugars
B. proteins
C. nucleotides
2. Which substance is most common in cells?
A. fat
B. water
C. amino acid
3. Which substance is a lipid?
A. RNA
B. sugar
C. cholesterol
4. What does the cell theory state?
A. that cells come from other cells
B. that cells come only from animals
C. that cells cannot be created or destroyed

68