Question

Biomolecule Abundance in Different Cell Types


A. Biomolecule
B. Muscle Cell (%)
C. Liver Cell (%)
D. Plant LeafCell (%)


A. Carbohydrates
B. 1
C. 5
D. 15


A. Lipids
B. 8
C. 5
D. 3


A. Proteins
B. 20
C. 18
D. 8

A. Nucleic Acids
B. 1
C. 2
D. 1

A. Water & Other
B. 70
C. 70
D. 73


Prompt
Anolyze the data table above and respond to the following prompt:
Muscle cells contain significantly more protein than plant leaf cells, while plant leaf cells contain much more carbohydrate than muscle cells. Using the data provided, construct a claim about why these differences exist.
Support your claim with evidence from the table and reasoning that connects the structure and function of each cell type to its biomolecule composition.

Write in a CER In. 4th graders response

Answer 1

Claim:
Muscle cells have more protein and plant leaf cells have more carbohydrates because each cell type needs different molecules to do its job.

Evidence:
- Muscle cells: 20% protein and 1% carbohydrate.
- Plant leaf cells: 8% protein and 15% carbohydrate.

Reasoning:
Proteins help muscles move and hold the muscle fibers together, so muscle cells need lots of protein (20%) to contract and work. Leaf cells make and store sugar from sunlight and build strong cell walls (cellulose), so they have much more carbohydrate (15%) than muscle cells. The numbers in the table show these big differences, and they match what each cell must do: muscles need protein for movement, and leaves need carbohydrates for energy and structure.