Asked by jojo
What is an animal cell?
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An animal cell is the basic structural and functional unit of animals. It is a eukaryotic cell, meaning it has a true nucleus and membrane-bound organelles that perform specific tasks needed for the cell’s survival and the organism’s life.
Key features
- Nucleus: contains the cell’s DNA and controls gene expression and cell activities.
- Plasma membrane: a lipid bilayer that surrounds the cell, controls what enters and leaves, and enables communication with other cells.
- Cytoplasm: the jelly-like fluid (cytosol) and the region where organelles are suspended and many chemical reactions occur.
- Mitochondria: produce most of the cell’s usable energy (ATP) by cellular respiration.
- Endoplasmic reticulum (ER): rough ER (with ribosomes) synthesizes proteins; smooth ER synthesizes lipids and detoxifies chemicals.
- Ribosomes: make proteins from amino acids.
- Golgi apparatus: modifies, sorts, and packages proteins and lipids for transport within or out of the cell.
- Lysosomes: contain enzymes that digest waste, worn-out organelles, and foreign material.
- Centrosomes/centrioles: organize microtubules and help during cell division.
- Small vacuoles and vesicles: store and transport materials.
Typical differences from plant cells
- No rigid cell wall (only a flexible plasma membrane).
- No chloroplasts (animal cells do not perform photosynthesis).
- Vacuoles are smaller and fewer (plants often have one large central vacuole).
- Animal cells commonly have centrioles and more prominent lysosomes.
Size and specialization
- Typical animal cells are roughly 10–30 micrometers across, but size varies.
- In multicellular animals, cells differentiate into many specialized types (muscle cells, nerve cells, blood cells, etc.) with structures suited to their roles.
In short: an animal cell is a membrane-bound eukaryotic cell with organelles that carry out the processes needed for growth, maintenance, energy production, and reproduction in animals.
Key features
- Nucleus: contains the cell’s DNA and controls gene expression and cell activities.
- Plasma membrane: a lipid bilayer that surrounds the cell, controls what enters and leaves, and enables communication with other cells.
- Cytoplasm: the jelly-like fluid (cytosol) and the region where organelles are suspended and many chemical reactions occur.
- Mitochondria: produce most of the cell’s usable energy (ATP) by cellular respiration.
- Endoplasmic reticulum (ER): rough ER (with ribosomes) synthesizes proteins; smooth ER synthesizes lipids and detoxifies chemicals.
- Ribosomes: make proteins from amino acids.
- Golgi apparatus: modifies, sorts, and packages proteins and lipids for transport within or out of the cell.
- Lysosomes: contain enzymes that digest waste, worn-out organelles, and foreign material.
- Centrosomes/centrioles: organize microtubules and help during cell division.
- Small vacuoles and vesicles: store and transport materials.
Typical differences from plant cells
- No rigid cell wall (only a flexible plasma membrane).
- No chloroplasts (animal cells do not perform photosynthesis).
- Vacuoles are smaller and fewer (plants often have one large central vacuole).
- Animal cells commonly have centrioles and more prominent lysosomes.
Size and specialization
- Typical animal cells are roughly 10–30 micrometers across, but size varies.
- In multicellular animals, cells differentiate into many specialized types (muscle cells, nerve cells, blood cells, etc.) with structures suited to their roles.
In short: an animal cell is a membrane-bound eukaryotic cell with organelles that carry out the processes needed for growth, maintenance, energy production, and reproduction in animals.
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