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Overview

Cell hypothesis expresses that living things are made out of at least one cells, that the cell is the fundamental unit of life, and that cells emerge from existing cells.Cell Theory And Cells As A Unit Of Life chapter we learn A cell is the littlest unit of a living thing.All living life forms are made of cells. A living thing, whether made of one cell (like bacteria) or many cells, is called a organism.

Basic Requirement

  • Class 11 Student

Skills Covered

  • Prokaryotic Cell

  • Eukaryotic Cell

Expert Review

What is a Cell?

The cell is defined as the structural and functional unit of all living organisms. Essentially, a cell is a structure with organelles that provide necessary functions for the organism. There are, however, differences between cells.

Animal cells are vastly different from those of plants. Cell walls are absent in animal cells, one of the primary differences between them. In the human body, the largest cell is the egg or the female ovum. It measures approximately 1 millimeter in diameter. In the human cerebellum, the smallest cell is the granule cell, which measures roughly 4.5 micrometers in size.

Cell Theory

It was originally proposed by Matthias Schleiden and Theodor Schwann that all living organisms consist of cells, and that new cells are formed from preexisting ones. Schleiden and Schwann put forward the theory, but other notable scientists have contributed to it, making it a universally accepted fact.

The prokaryotic cell

Prokaryotic cells are unicellular microorganisms and among the oldest organisms on Earth. Prokaryotes come in a variety of types, some of which are extremophiles. Some plants are photoautotrophs, able to produce nutrients from the sun's energy.

All reactions occur within the cytoplasm of a prokaryotic cell, since it has only one membrane. In addition to being free-living, they can also be found in the guts of other organisms such as ruminants (cows and buffaloes).

The eukaryotic cell

The nucleus of eukaryotic cells is enclosed in a membrane as opposed to the nucleus of prokaryotic cells. The domain Eukaryota includes all multicellular organisms, all of which are eukaryotic. Eukaryotic cells are larger structurally than prokaryotic cells, having a volume 10,000 times greater than prokaryotic cells. In addition to membrane-bound organelles, eukaryotic cells contain various membrane-bound organelles specialized for specific functions.

Cell Organelles

Eukaryotes possess a wide variety of cellular organelles that carry out a variety of functions. The cell wall, for example, is unique to plant cells.

1) Cell Membrane

2) Cell wall

3) Mitochondria

4) Plastids

5) Ribosomes

6) Cytoskeletons

7) Centrosome

9) Centrioles

10) Nucleus

11) Microbodies

12) Cilia and Flagella

13) Contains the endoplasmic reticulum and the Golgi apparatus. Plant cells have central vacuoles.


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Course creator


                                 Leena S

Leena S

I Am a Trained Teacher having more than 10 years of experience in Biology subject also I deal with school operation and Management. I have done masters In Biotechnology.