Biology Worksheet

Topics: Cell, Eukaryote, Bacteria Pages: 4 (647 words) Published: November 7, 2013
Name: _______________________________________ Date: _________________ Per: _____________

Cells: The Basic Unit of Life

Directions: Define the key terms and then complete the following Section Reviews after reading through Sections 5.1 through 5.3. You will complete your answers on a separate sheet of paper and then staple this worksheet on top.

Vocabulary Words:

Cell Wall
Cell Theory
Nuclear Envelope
Cell Membrane

Cells: The smallest structural and functional unit of an organism.

Cell Theory: The theory that all living matter consists of cells and that cells are the structural and functional units of life.

Cell Membrane: Lies immediately against the cell wall in plant cells/ Made of protein and phospholipids/ Selectively permeable.

Cell Wall: Dead layer, large empty spaces present between cellulose fibers, freely permeable Made of cellulose which forms very thin fibers, strong and rigid, found in plant cells, protect and support the enclosed substances (protoplasm), resist entry of excess water into the cell, give shape to the cell

Nucleus: Controls the normal activities of the cell, contains the DNA, bounded by a nuclear membrane, contains chromosomes. Each cell has fixed number of chromosomes that carry genes. Genes control cell characteristics.

Eukaryote: Contain 3 basic cell structures: Nucleus, cell membrane, cytoplasm with organelles. Usually plant an animal cells.

Prokaryote: Nucleoid region contains the DNA, Cell membrane & cell wall, Contain ribosomes (no membrane) to make proteins in their cytoplasm.

Nuclear Envelope: The double lipid bilayer membrane that surrounds the genetic material and nucleolus in eukaryote cells.

Nucleolus: Is an organelle found in cells that make ribosomes.

Chromosome: A threadlike strand of DNA. It determines the color of our hair, skin, eyes, ect…

Cytoplasm: Jelly - like substance...
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