Protein Synthesis – Flashcards
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The diagram shows one step in the process of protein synthesis.
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What is the purpose of the peptide bond that is shown in the diagram?
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It connects amino acids
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During transcription, what happens to the RNA polymerase if a repressor protein attaches to the operator?
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It cannot attach to the promoter
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Only the proteins that the bacteria Escherichia coli (E. coli) needs are synthesized at any given time. For example, when lactose is available in the environment, E. coli will express the lac genes that allow it to break down lactose to obtain energy. When lactose is not present, these genes are not expressed.
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Which prevents the lac genes in the DNA of E. coli from being expressed most of the time?
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the lac repressor
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Which mRNA sequence is the complement to the DNA sequence GATCAC?
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CUAGUG
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Which describes a promoter?
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the first part of an operon that regulates where, when, and to what level a gene is expressed
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Which is composed of amino acids and determines all the structures and functions of organisms?
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protein
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The diagram shows one step in the process of protein synthesis.
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Which step is shown?
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translation
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The molecule that brings amino acids to the ribosomes to be assembled into proteins is
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tRNA
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Which occurs during transcription?
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mRNA is synthesized from a strand of DNA.
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Which nucleic acid moves the code for protein synthesis from the nucleus to the ribosomes?
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mRNA
