Cell Structure and Functions

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Which cell part holds materials, such as water, and is large in a plant cell?

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

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Which of the following is not an accurate description of the nucleus?

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

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What organelle breaks down food to release energy?

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

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Which organelle or cell part is critical for energy conversion in plants?

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

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What cellular process is performed by the ribosome?

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

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What cellular process is performed by the cell membrane?

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

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Which of the following is not an accurate statement about a virus?

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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A microscope shows a tiny thing change and then divide into two apparent copies of the original. Could it be a virus?

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

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Multicellular organisms have specialized cells that do specific functions. Which of these are specialized plant cells?

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

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What is the cause of influenza?

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

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What term describes a red blood cell, which carries oxygen to cells throughout the body via the circulatory system?

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

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What is the first step in the cell cycle?

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

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Once interphase is complete, the cell is ready for what process?

Not quite. The phase that follows interphase is mitosis.

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Which of the following does not describe mitosis?

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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During which step of the cell cycle is the DNA replicated?

Not quite. DNA is replicated during interphase step S.

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During DNA replication, what helps the double helix DNA molecule "unwind"?

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

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What is the name of the process by which genetically identical cells become specialized and different from each other?

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

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Disruption of the cell cycle can lead to which of the following diseases?

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

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The process of cell differentiation can be affected by which of the following?

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

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A dermal cell and a nerve cell from the same organism have the same __________.

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

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Sugars and starches are examples of __________.

Not quite. Sugars and starches are carbohydrates.

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Which of the following is not a lipid?

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

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DNA and RNA molecules are examples of this type of biomolecule.

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

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Which of the following statements does not describe biomolecules?

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

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Which of the following is not an organic molecule?

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

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__________ __________ are organic monomers that link together to form a protein, which is a complex polymer.

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

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