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Cells - The Building Blocks of Living Things

Science, Grade 4

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Cells -The Building Blocks of Living Things © Copyright NewPath Learning. All Rights Reserved. 94-4401 www.newpathlearning.com vacuole vacuole nucleus cell wall cell membrane chloroplast mitochondria cell membrane nucleus cytoplasm Animal cell Plant cell Microorganisms Chloroplasts are only found in plant cells. Chloroplasts catch the sun’s energy and help plants make their own food. A microorganism is an organism that is too small to see with our eyes alone. Scientists are only able to view a microorganism through a microscope. Many microorganisms are unicellular. Cells are the building blocks of life. All living things are made of cells. A unicellular organism is made up of only one cell while a multicellular organism is made up of many cells. Cells have particular functions or roles. Some cells help the organism get energy; others get rid of wastes while others provide protection. Animal and plant cells have similar and different parts or organelles. Both cell types have a nucleus, cytoplasm and a cell membrane. The cell membrane separates the cell from everything outside the cell. It guards everything that comes in and out of the cell, protecting the cell. The nucleus is the control center of the cell. It makes sure that all the cell parts do their jobs in order to keep the cell working properly. Every cell is filled with a gel-like liquid called cytoplasm. The main job of the cytoplasm in a cell is to hold all cell parts in place. Vacuoles are found in the cytoplasm of most plant cells and some animal cells. Their function is to store materials needed by a cell and to remove unwanted debris. Mitochondria are rod-shaped organelles that provide cells with energy. Plant cells also have a cell wall, which an animal cell does not have. The main job of a plant’s cell wall is to support and protect the cell. It is located outside the plant cell’s cell membrane. Examples of unicellular organisms include amoebae and bacteria. amoeba paramecium bacteria

© Copyright NewPath Learning. All Rights Reserved. 94-4401 www.newpathlearning.com Describe the following: Nucleus __________________________________ __________________________________________ Cell membrane ____________________________ __________________________________________ Cytoplasm _________________________________ __________________________________________ Chloroplast ____________________________ __________________________________________ Cell wall _______________________________ __________________________________________ Vacuole ________________________________ __________________________________________ Mitochondrion _________________________ __________________________________________ Cells -The Building Blocks of Living Things Animal cell Microorganisms Plant cell What is a cell? ____________________________________ _________________________________________________ _________________________________________________ What is a multicellular organism? ___________________ _________________________________________________ What is a unicellular organism? _____________________ _________________________________________ How are plant and animal cells different? _____________________________________ _____________________________________ Key Vocabulary Terms Key Vocabulary Terms • amoeba • mitochondria • bacteria • multicellular • cell membrane • nucleus • cell wall • paramecium • chloroplast • unicellular • cytoplasm • vacuole \|xiBAHBDy01712nzW