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img164 - I\‘\—’/e G0 to the next screen The DNA...

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Unformatted text preview: I\‘\—’!/e G0 to the next screen: The DNA consists of two strands of nucleotides held together by hydrogen bonds. The DNA directs the sequence of the amino acids that will make up a specific protein. The section of DNA that holds the code for a particular protein is called a gene. Only one DNA strand, the sense strand, contains the actual code. + 5 34M - “He-L $WCVLCQ‘HI\§C\_ Go to the next screen: The first step in protein synthesis is to make a copy of the DNA gene that codes for the desired protein. This step is called Wil- Go to the next screen: The mRNA moves fiom the nucleus through the nuclear pores to the cytoplasm of the cell. Ribosomes are the “workbench” for protein Ribosomes can be found free in the cytosol or attached to the rough endoplasmic reticulum (the red dots shown here). Go to the next screen: Ribosomes exist as two subunits — the large ribosomal subunit and the small ribosomal subunit. These two subunits come together to form the n'bosome that will undertake the translation process. Here you see the mRNA moving from the nucleus through the pore into the cytoplasm. You also see the nhosome subunits coming together to accept the mRNA template. A signal on the ER membrane directs the ribosome to the rough ER G0 to the next screen: Ribosomes use the mRNA as a template to link the correct sequence of amino acids together to form specific proteins. ...
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