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www.reference.com/article/viruses-ribosomes-d0e78a466963a465

According to Nature, viruses do not have ribosomes. Therefore, they cannot form proteins from messenger RNA; this is why viruses must have host cells in order to replicate. Biology 4 Kids indicates that viruses also lack nuclei and mitochondria. Cytoplasm is missing from some viruses, as well.

www.reference.com/article/ribosomes-composed-81327b9d4ad34ef5

A ribosome consists of two subunits: the large and small subunits. The materials that make up ribosomes are ribonucleic acid, or RNA, and proteins, with approximately 60 percent of a ribosome being made of ribosomal RNA and the other 40 percent consisting of proteins, according to Florida State Univ

www.reference.com/article/prokaryotes-ribosomes-217cf8af0028e6be

Prokaryotic cells contain ribosomes to handle their protein production. The ribosomes in prokaryotic cells, such as bacteria, are free floating in the cytosol of the cell rather than bound inside a nuclear membrane; this is because prokaryotic cells do not have a nucleus.

www.reference.com/science/good-analogy-ribosome-6369015e9410f314

Ribosomes are like chefs; they take the ingredients and put them together in a complex finished product. Ribosomes are organelles within cells responsible for taking the mRNA and constructing complex polypeptides.

www.reference.com/science/function-t-cells-56815f6baa741252

The function of T cells is to perform a variety of immune responses in the body, according to National Multiple Sclerosis Society. T cells are one of two types of white blood cells that help immune function.

www.reference.com/article/function-typical-animal-cell-fb9533fceb2f6160

Animal cells function in a variety of ways, depending on the type of cell they are, but common cells perform functions such as digestion, support and nerve transmission. There are a number of different types of cells in every animal, though most animals have similar types of cells. Cell function inf

www.reference.com/science/types-cells-animal-cells-74972601835ea42a

Animal cells are eukaryotic cells, or cells that contain a membrane-bound nucleus. The nucleus holds the DNA of the cell that provides the cell with instructions for life.

www.reference.com/science/animal-cells-c13c4abb6dc44a3c

An important fact about animal cells is that they are eukaryotic cells. Although plant and animal cells are both eukaryotic, animal cells have different organelles and are smaller than plant cells. An organism can be composed of up to trillions of animal cells, with hundreds of different types and f

www.reference.com/science/function-cell-body-9a942ebfcd8ded84

The main function of the cell body of a neuron is to integrate synaptic information and transmit this information to other cells via the axon. The cell body also completes a variety of biochemical processes to keep the neuron functioning properly.

www.reference.com/science/function-plant-cell-ea580b8541b7bf77

As the basic living part of a plant, the plant cell is involved in many physiological and structural activities. They range from synthesis of proteins and energy to maintaining structural integrity and tautness.