Question

which statement best describes the cell theory?
a. cells are only found in multicellular organisms.
b. the nucleus is the most important part of the cell.
c. all living organisms are composed of cells, and new cells arise from pre - existing cells.
d. cells are only involved in reproduction.

where are ribosomes partially assembled in the cell?
a. mitochondria
b. nucleolus
c. cytoplasm
d. endoplasmic reticulum

Explanation:

• Cell Theory Question:
• Option a: Incorrect. Unicellular organisms (e.g., bacteria, amoeba) also have cells.
• Option b: Incorrect. While the nucleus is important, cell theory is about the basic unit of life (cells) and their origin, not emphasizing one part of the cell as the "most important".
• Option c: Correct. Cell theory states that all living things are made of cells and new cells come from pre - existing cells.
• Option d: Incorrect. Cells have many functions (e.g., metabolism, growth, not just reproduction).
• Ribosome Assembly Question:
• Option a: Incorrect. Mitochondria are the powerhouses of the cell (produce ATP).
• Option b: Correct. The nucleolus is involved in ribosome assembly (synthesizes ribosomal RNA and combines it with proteins).
• Option c: Incorrect. The cytoplasm is the fluid - like substance where many cell processes occur, but not where ribosomes are partially assembled.
• Option d: Incorrect. The endoplasmic reticulum is involved in protein and lipid synthesis, not ribosome assembly.

Answer:

• For the cell theory question: C. All living organisms are composed of cells, and new cells arise from pre - existing cells.
• For the ribosome assembly question: B. Nucleolus.