Question

which organelles are only found in plants?
mitochondria
chloroplast
cell wall
nucleus
central vacuole
ribosomes
a student is asked to differentiate between the structure of a lipid and a protein. which of the following is the key structural difference?
lipids are composed of amino acids, while proteins are composed of fatty acids.
lipids are polymers, while proteins are not.
proteins are long chains of amino acids, while lipids consist of glycerol and fatty acids.
proteins are used for energy storage, while lipids are used for structural support.

Explanation:

1. For the first question about plant - only organelles: Mitochondria are in both plant and animal cells for energy production. Chloroplasts are unique to plant cells for photosynthesis. Cell walls are mainly in plant cells (also in fungi and some bacteria), but not exclusive to plants in a very strict sense. The nucleus is in both plant and animal cells as the control center. The central vacuole is large and prominent in plant cells and is not typically found in animal cells in the same form. Ribosomes are in both plant and animal cells for protein synthesis.
2. For the second question about the difference between lipids and proteins: Lipids are composed of glycerol and fatty acids, not amino acids. Proteins are long - chain polymers of amino acids. Lipids are not polymers in the same sense as proteins. Proteins are not mainly used for energy storage (lipids are for long - term energy storage).

Answer:

1. Chloroplast, Central Vacuole
2. Proteins are long chains of amino acids, while lipids consist of glycerol and fatty acids.