basic cell structure, Slides of Cell Biology

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Basic Cell Structure

Cells

Basic building blocks of life Understanding of cell morphology is critical to the study of biotechnology

Cell

Many cannot be seen with the naked eye A cell may be an entire organism or it may be one of billions of cells that make up the organism

Cells

Divided and classified in many ways One common classification method is the presence or absence of a cell necleus

Nucleus

Prokaryotes – have no nucleus Eukaryotes – have a nucleus

Prokaryotes

Single celled organism Kingdom Monera Lacks a cell nucleus Internal structure is less organized than other cells

Blue green bacteria

Have ability to produce their own food like plants Most bacteria get their food from other sources

Prokaryotes

Less complex than eukaryotes Still have many of the basic internal characteristics

Eukaryotes

Organism made up of cells that have a nucleus May be single celled – Kingdom Protista May have billions of cells like plant and animal kingdoms

Eukaryotes

Single celled eukaryotes include paramecia, euglena, and diatoms

Eukaryotes

Human body has at least 85 different cell types All eukaryotes have a number of structures in common

Common structures

Organelles – smaller parts of the cell with specific funtions Cell membrane – acts as a gatekeeper

Cell wall

Provides additional structure and protects the cell from pressure caused by movement of water Animal cells do not have walls

Cytoplasm

Organelles are surrounded by a jelly like substance Primary component is water