An animal cell has all of the following structures except ________
Chloroplasts and cell walls.
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To find the answer to this question, we need to know the structures that are commonly found in an animal cell. The structures commonly found in an animal cell include the nucleus, cell membrane, cytoplasm, mitochondria, endoplasmic reticulum, Golgi apparatus, ribosomes, lysosomes, and peroxisomes.
To determine which of these structures is not present in an animal cell, we can go through the list and identify the structure that does not belong. Let's go through the list:
1. Nucleus: The nucleus is a membrane-bound organelle that contains the cell's genetic material. It is a vital structure in an animal cell.
2. Cell membrane: The cell membrane surrounds the cell and regulates the entry and exit of substances. It is present in an animal cell.
3. Cytoplasm: The cytoplasm is a gel-like substance inside the cell that holds organelles. It is present in an animal cell.
4. Mitochondria: Mitochondria are responsible for producing energy (ATP) in the cell. They are present in an animal cell.
5. Endoplasmic reticulum: The endoplasmic reticulum is involved in the synthesis and transport of proteins and lipids in the cell. It is present in an animal cell.
6. Golgi apparatus: The Golgi apparatus modifies and packages proteins for transport within or out of the cell. It is present in an animal cell.
7. Ribosomes: Ribosomes are responsible for protein synthesis. They are present in an animal cell.
8. Lysosomes: Lysosomes contain enzymes that break down waste materials and cellular debris. They are present in an animal cell.
9. Peroxisomes: Peroxisomes are involved in various metabolic processes, including lipid metabolism. They are present in an animal cell.
Now that we have examined all the structures, we can conclude that an animal cell does not have chloroplasts. Chloroplasts are specific to plant cells and are responsible for photosynthesis.
Therefore, the answer to the question "An animal cell has all of the following structures except ________" is chloroplasts.