Question

question 7
which of the following was not part of the original cell theory, but was added later after we learned more about cell life processes?
all living things are made of cells
metabolism occurs within cells
cells are the basic unit of life
cells arise from pre-existing cells

question 8
although there are many different types of cells, all cells have the same ______.
basic composition
amount of cytoplasm
method for obtaining energy
reproduction methods

Explanation:

Analyze Question 7

Using the Cell Theory and Modern Cell Theory knowledge points

• The classical cell theory formulated by Schleiden, Schwann, and Virchow states:

1. All living organisms are composed of one or more cells.
2. The cell is the basic unit of structure and organization in organisms.
3. Cells arise from pre-existing cells.

• Modern cell theory added tenets as scientific understanding of cell biology progressed, including:
• Energy flow (metabolism and biochemistry) occurs within cells.
• Cells contain hereditary information (DNA) passed from cell to cell during division.
• All cells are basically the same in chemical composition in organisms of similar species.
• Therefore, "metabolism occurs within cells" is a modern addition.

Analyze Question 8

Using the Universal Cell Features knowledge point

• All cells share certain fundamental structural and chemical features regardless of their specialized functions or whether they are prokaryotic or eukaryotic.
• These universal features include having a cell membrane, cytoplasm, genetic material (DNA), and ribosomes, which constitute their basic chemical and structural composition.
• Other options vary widely: the amount of cytoplasm differs by cell size, methods for obtaining energy differ (e.g., phototrophs vs. heterotrophs), and reproduction methods differ (e.g., binary fission vs. mitosis/meiosis).
• Thus, all cells share the same basic composition.

Answer:

Question 7

• all living things are made of cells
• metabolism occurs within cells (Correct answer)
• cells are the basic unit of life
• cells arise from pre-existing cells

Question 8

• basic composition (Correct answer)
• amount of cytoplasm
• method for obtaining energy
• reproduction methods