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Figure 2.3.1 - Annotated drawing of an animal cell

Living organisms are divided into two groups on the basis of their cellular structure: prokaryotes and eukaryotes.

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7.2 cell structure worksheet answers in Common Worksheets category

Life is both wonderful and majestic. Yet for all of its majesty, all organisms are composed of the fundamental unit of life, the . The cell is the simplest unit of matter that is alive. From the unicellular to multicellular animals, the cell is one of the of . Let's look at some of the components of this basic organizer of living organisms.

Then, about 1.5 billion years ago, a nucleated cell called eukaryote evolved.

The following links describe the major differences between prokaryotic and eukaryotic cells, the way they divide and the way in which antibiotics have their action on prokaryotic cells.

Addition 7 2 Cell Structure Worksheet Answers Moreover Animal Cell

But prokaryotes and eukaryotes are the only true cell structures and types.

In prokaryotes, some species of spirochaetes and bacteria have been found with linear chromosomes. In addition, prokayrotes contain extra-chromosomal DNA called plasmids. Bacteria are able to pass plasmids from one to another and express the genes on them: this is an important source of the spread of antibiotic resistance genes through bacterial populations. Plasmids are also normally circular, but linear structures also exist.

Golgi apparatus: Receives proteins from the rough endoplasmic reticulum and may further modify them. It also packages proteins before the protein is sent to it’s final destination which may be intracellular or extracellular.

Figure 2.3.2 - Electron micrograph of an animal cell

They are used for motility and adhering to surfaces or moving matter outside the cells.

There are also many distinctions between eukaryotic and prokaryotic cell structures. The following table compares the and structures found in a typical prokaryotic cell to those found in a typical animal eukaryotic cell.

Both eukaryotic and prokaryotic organisms get the energy they need to grow and maintain normal cellular function through . Cellular respiration has three main stages: , the , and electron transport. In eukaryotes, most cellular respiration reactions take place within the . In prokaryotes, they occur in the and/or within the .

It is believed by scientists that eukaryotic cells evolved from prokaryotic cells.
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  • Prokaryotes do not have any mitochondria whereas eukaryotes do.

    Eukaryotic Cells

  • Regulation Of The Cell Cycle Answer Key ...

    Nucleus: Contains the chromosomes and therefore the hereditary material. It is responsible for controlling the cell.

  • On Cell Cycle Mitosis Diagram Worksheet

    Prokaryotes have small ribosomes (70S) compared to eukaryotes which have large ribosomes (80S).

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the green pigment inplant cells that absorbs sunlight

Most prokaryotes and some through a process called . During binary fission, the single DNA molecule replicates and the original cell is divided into two identical . Some eukaryotic organisms also reproduce asexually through processes such as budding, regeneration, and .

Prokaryotic and Eukaryotic Cells will be available on

Eukaryotic cellules have a limited surface area, thus, making it very difficult for the nutrients to readily diffuse in the interior parts of the cells.

Autotrophic activityin plant cells occur in organelles called ...

Although the cells are different in many ways, the main similarity is survival of the organism and carrying out the same process of life.

The Similarities

There are many other cell types in different forms, like neurons, epithelial, muscle cells, etc.

Organisms that are mainly unicellular and have a cell type.

Strictly speaking, all nucleated (eukaryotic) cells contain circular DNA. In addition to the nucleus, the mitochondria (which break down food molecules and create chemical energy) and chloroplasts (which facilitate photosynthesis) also have small stores of their own DNA and this DNA is circular. This adds weight to the hypothesis that these organelles were once prokaryotic cells that came to exist in symbiosis with early eurkaryotes.

PH School - Compare Prokaryotic & Eukaryotic Cells

So school has taught us that eukaryotes have DNA that is linear and inside of a membrane - called the nucleus. And that prokaryotes have circular DNA that is free floating inside of the cell.

BioCoach Activity Concept 1: Common Features of All Cells

There is also cytoplasmic DNA free-floating in eukaryotic cells. These are also circular and normally contain short copies of chromosomal DNA sequences. Their function is not well understood.

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