Flashcard Set
Topic: Cells & Organisms (Middle School Biology) Cells are the basic unit of life All organisms are made of cells Unicellular organisms have one cell Multicellular organisms have many specialized cells Cells vary in shape, size, and function Most ce
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What is the basic unit of life?
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The basic unit of life is the cell. Cells are the smallest functional units of living organisms and are responsible for carrying out the processes necessary for life.
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All living organisms, from the smallest bacteria to the largest whale, are made up of cells.
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What are unicellular organisms?
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Unicellular organisms are organisms that consist of a single cell. This one cell performs all necessary functions to sustain life.
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Examples of unicellular organisms include bacteria, yeast, and certain types of algae.
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What are multicellular organisms?
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Multicellular organisms are made up of many cells that work together to perform specialized functions. These cells often group into tissues and organs.
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Examples of multicellular organisms include humans, trees, and animals like dogs and cats.
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How do cells vary in shape and size?
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Cells can vary greatly in shape and size depending on their function. For example, nerve cells are long and branched, while red blood cells are round and disc-shaped.
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The shape of a cell is often related to its role; for instance, muscle cells are long to help them contract.
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What is cellular specialization?
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Cellular specialization refers to the process by which cells develop different structures and functions to perform specific tasks within an organism.
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In multicellular organisms, specialized cells include muscle cells, nerve cells, and epithelial cells, each tailored for unique functions.
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What are the two main types of cells?
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The two main types of cells are prokaryotic cells and eukaryotic cells. Prokaryotic cells do not have a nucleus or membrane-bound organelles, while eukaryotic cells do.
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Bacteria are examples of prokaryotic cells, while plants, animals, and fungi are made up of eukaryotic cells.
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What is the function of the cell membrane?
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The cell membrane is a protective barrier that surrounds the cell, controlling what enters and exits the cell. It helps maintain homeostasis.
Additional Info
The cell membrane is selectively permeable, meaning it allows certain substances to pass while blocking others.
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What role do organelles play in a cell?
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Organelles are specialized structures within a cell that perform distinct processes. Each organelle has a specific function that contributes to the cell's overall operation.
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Examples of organelles include the mitochondria (energy production), ribosomes (protein synthesis), and the nucleus (genetic information storage).
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What is homeostasis in cells?
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Homeostasis is the process by which cells and organisms maintain a stable internal environment despite changes in external conditions.
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Cells maintain homeostasis through various mechanisms, such as regulating temperature, pH, and nutrient levels.
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How do cells communicate with each other?
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Cells communicate through signaling molecules, such as hormones and neurotransmitters. This communication is essential for coordinating activities among cells.
Additional Info
Cell communication is crucial for processes like growth, immune responses, and maintaining homeostasis.
Topic: Cells & Organisms (Middle School Biology) Cells are the basic unit of life All organisms are made of cells Unicellular organisms have one cell Multicellular organisms have many specialized cells Cells vary in shape, size, and function Most ce
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