Not quite. A vacuole is a cell part that holds materials.

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Not quite. The nucleus contains chromosomes made of DNA and controls the cell's activities.

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Not quite. Mitochondria are organelles that break down food to release energy.

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Not quite. Chloroplasts contain chlorophyll which is used in photosynthesis to convert light energy into chemical energy.

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Not quite. Ribosomes help make, or synthesize, proteins.

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Not quite. The cell membrane controls what enters and leaves the cell (transport) and helps maintain homeostasis.

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Not quite. A virus is a tiny, non-living thing with a head and tail structure that uses a host cell to reproduce. Antibiotics cannot kill it.

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Not quite. The thing cannot be a virus, because a virus cannot reproduce by itself. It requires a host cell.

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Not quite. Guard cells, xylem cells, and epidermis cells are all specialized plant cells.

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Not quite. The influenza virus causes influenza, or the flu.

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Not quite. A red blood cell is a specialized cell.

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Not quite. The first step in the cell cycle is interphase step G1, intense growth and enzyme production.

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Not quite. The phase that follows interphase is mitosis.

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Not quite. Mitosis yields two identical daughter cells and is followed by cytokinesis. Mitosis does not result in four daughter cells.

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Not quite. DNA is replicated during interphase step S.

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Not quite. Enzymes help the double helix DNA molecule "unwind" during DNA replication.

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Not quite. Cell differentiation is the process by which genetically identical cells become specialized.

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Not quite. Disruption of the cell cycle could lead to cancerous growths.

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Not quite. Cell differentiation is affected by DNA, RNA, and the environment.

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Not quite. All cells from a single organism have the same DNA.

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Not quite. Sugars and starches are carbohydrates.

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Not quite. Steroids, waxes, fatty acids, and oils are lipids.

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Not quite. DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are both nucleic acids.

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Not quite. Biomolecules are organic molecules produced by organisms, such as hormones. They can react to form different molecules.

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Not quite. DNA, protein, and carbohydrates are organic molecules, but nitrogen is not.

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Not quite. A protein is made of linked amino acids.

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