Question

elect all of the following that are principles of the cell theory.
cells are the basic unit of structure and function in all organisms.
all organisms are composed of cells.
all cells come from preexisting cells.
all cells contain cell walls.
all cells are less than 10 μm in size.
all cells contain membrane - bound organelles.

Explanation:

1. Recall the principles of cell theory:

• Cells are the basic unit of structure and function in organisms.
• All organisms are composed of one or more cells.
• All cells arise from pre - existing cells.

1. Analyze each option:

• "Cells are the basic unit of structure and function in all organisms." – This is a principle of cell theory.
• "All organisms are composed of cells." – This is a principle of cell theory.
• "All cells come from preexisting cells." – This is a principle of cell theory.
• "All cells contain cell walls." – False, animal cells do not have cell walls.
• "All cells are less than 10 μm in size." – False, some cells (e.g., ostrich egg cells) are larger.
• "All cells contain membrane - bound organelles." – False, prokaryotic cells do not have membrane - bound organelles.

Answer:

• Cells are the basic unit of structure and function in all organisms.
• All organisms are composed of cells.
• All cells come from preexisting cells.