A eukaryotic cell has a membrane bound nucleus and membrane bound structures called organelles, which have specialized functions. Eukaryotic means "true nucleus" and the word organelle implies "little organ". Organelles have specific cellular functions similar to the way organs have specialized functions. 

Eukaryotic cell

A prokaryotic cell is a unicellular organism that lacks a defined nucleus and membrane bound organelles. As a result, many catabolic processes occur within the cytosol. 

Prokaryotic cell

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Cell

Wikipedia

Tissue

The molecular structures and processes of cellular life and their roles in the function, reproduction, and development of living organisms.

- The Central Dogma of Life
- Cell Organelles

Molecular and Cellular Biology

The (metabolic) center of a neuron. It is in charge of keeping the cell alive

Cell body

Animal cell organelles are specialized entities in a cell that performs a particular function. 

- Nucleus
- Endoplasmic Reticulum
- Golgi Apparatus
- Ribosome
- Mitochondria
- Lysosome
- Peroxisome 
- Cell membrane

Animal Cell Organelles

Cell theory is a scientific theory with three claims:
- all living organisms are made up of one or more cells
- cells are the smallest unit of structure in organisms
- cells are made from other cells

Cell Theory

Types of Cells

Cell-cell interactions describe the process in which one cell influences the differentiation of neighboring cells during the development of the nervous system. This process is a key reason why vertebrate brains are less hardwired and more susceptible to environmental cues and experience. In contrast, invertebrate development, such as in C. elegans, is more hardwired and relies less on cell-cell interactions, making their mitotic lineages strictly predictable and easier to trace.

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