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What?
· Cells need to make proteins. Those proteins
might be used as enzymes or as support for
other cell functions. When you need to make
proteins, you look for ribosomes.…read more

Slide 3

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Why?
· Ribosomes are the protein builders or the
protein synthesizers of the cell. In effect, they
connect one amino acid at a time until a chain is
created.…read more

Slide 4

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Where?
· Ribosomes are found in many places
around the cell. You might find them
floating in the cytoplasm. Those
floating ribosomes make proteins that
will be used inside of the cell.
· Other ribosomes are found on the
endoplasmic reticulum. Which looks
bumpy under a microscope. Those
attached ribosomes make proteins
that will be used inside the cell and
proteins made for export out of the
cell.…read more

Slide 5

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Structure
· A ribosome is not just one piece.
There are two pieces or subunits.
Scientists named them 60-S (large)
and 40-S (small). The mRNA is sent
into the cell and the ribosomes. When
it is time to make the protein, the two
subunits come together and combine
with the mRNA. The subunits lock onto
the mRNA and start the protein
synthesis.…read more

Slide 6

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How?
· The mRNA (which is made in the nucleus)
combines with the ribosome subunits.
· Another nucleic acid lives in the cell - tRNA,
which stands for transfer RNA. tRNA is bonded
to the amino acids floating around the cell.
· With the mRNA offering instructions, the
ribosome connects to a tRNA and pulls off one
amino acid.
· Slowly the ribosome makes a long amino acid
chain that will be part of a larger protein.…read more

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