BIOL 1840U Lecture Notes - Lecture 7: Start Codon, Dna Replication, Ribosomal Rna

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2 Nov 2018

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Transcription produces mrna from the dna sequence of a gene. Mrna moves from the nucleus to cytoplasm. Translation assembles the amino acids of proteins. The first thing needed is dna sequence of a gene. Transcription begins with rna polymerase binds to a region of dna called a promoter. Rna polymerase begins to unwind the dna. Then it starts adding and linking nucleotides complementary to one of the. A similar process would make rrna and trna. Only one strand of dna is used as a template in transcription. The product is single stranded rna not double stranded dna. Specific segments (genes) are transcribed into rna not the entire dna molecule. Dna is only replicated prior to cell division. Genes are segments of dna that encode proteins. Mrna is the info that specifies the order of amino acids. A sequence of 3 nucleotide in mrna specifies an amino acids. Each group of three nucleotides is called a codon.

Related Questions

Order the following choices to examine the process of transcription.

- RNA polymerase moves along the template strand of DNA adding complementary RNA nucleotides, extending the mRNA.

-RNA polymerase binds at the promoter region just upstream from the gene.

-RNA polymerase unwinds the DNA at the promoter site and begins to transcribe the template strand of DNA.

-Transcription continues until a termination site in the DNA is reached.

-The mRNA transcript is released.

During transcription in eukaryotes, a type of RNA polymerase called RNA polymerase II moves along the template strand of the DNA in the 3'â5' direction. However, for any given gene, either strand of the double-stranded DNA may function as the template strand. Which of the following initially determines which DNA strand is the template strand, and therefore in which direction RNA polymerase II moves along the DNA?

A. the location of specific proteins (transcription factors) that bind to the DNA

B. the specific sequence of bases along the DNA strands

C. the location along the chromosome where the double-stranded DNA unwinds

D. the position of the geneâs promoter on the chromosome

E. which of the two strands of DNA carries the RNA primer

1)Which of the following is NOT correct when considering the initiation of transcription in E. coli?

A) The Ï subunit of RNA polymerase makes strong contacts with the -10 region of promoters.

B) Only the -10 region of the promoter is required.

C) DNA melting near the transcription start site is essential for promoter recognition.

D) The phosphodiester bonds that are formed are not stable until about 10 nucleotides have been incorporated.

E) The RNA polymerase contacts about 50 bp of DNA.

2)In bacteria, mRNA, tRNA and rRNA are all transcribed by the same RNA polymerase.(TRUE/FALSE)

BIOL 1840U Lecture Notes - Lecture 7: Start Codon, Dna Replication, Ribosomal Rna

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