Describe Transcription Process - Biology
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Identify the correct mRNA base added opposite a DNA template base $T$.
Identify the correct mRNA base added opposite a DNA template base $T$.
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A. Complementary base pairing during transcription process.
A. Complementary base pairing during transcription process.
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How does alternative splicing affect protein synthesis?
How does alternative splicing affect protein synthesis?
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It allows one gene to produce multiple protein variants. Increases protein diversity from limited number of genes.
It allows one gene to produce multiple protein variants. Increases protein diversity from limited number of genes.
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What is an intron?
What is an intron?
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A noncoding RNA segment removed from pre-mRNA. Non-coding sequences removed during RNA processing.
A noncoding RNA segment removed from pre-mRNA. Non-coding sequences removed during RNA processing.
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What is the main function of the $5'$ cap on eukaryotic mRNA?
What is the main function of the $5'$ cap on eukaryotic mRNA?
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Protects mRNA and helps ribosome binding for translation. Essential for mRNA stability and efficient translation initiation.
Protects mRNA and helps ribosome binding for translation. Essential for mRNA stability and efficient translation initiation.
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Which molecule binds the promoter first in eukaryotes to help recruit RNA polymerase II?
Which molecule binds the promoter first in eukaryotes to help recruit RNA polymerase II?
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General transcription factors. Required proteins that assemble at promoter before RNA polymerase.
General transcription factors. Required proteins that assemble at promoter before RNA polymerase.
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What modification is added to the $3'$ end of eukaryotic pre-mRNA?
What modification is added to the $3'$ end of eukaryotic pre-mRNA?
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A poly-$A$ tail. Adenine nucleotides added to protect and stabilize mRNA.
A poly-$A$ tail. Adenine nucleotides added to protect and stabilize mRNA.
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What modification is added to the $5'$ end of eukaryotic pre-mRNA?
What modification is added to the $5'$ end of eukaryotic pre-mRNA?
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A $5'$ cap (modified guanine nucleotide). Protective modification enhancing mRNA stability and function.
A $5'$ cap (modified guanine nucleotide). Protective modification enhancing mRNA stability and function.
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What is RNA processing in eukaryotes?
What is RNA processing in eukaryotes?
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Modification of pre-mRNA to produce mature mRNA. Post-transcriptional modifications prepare RNA for translation.
Modification of pre-mRNA to produce mature mRNA. Post-transcriptional modifications prepare RNA for translation.
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What is the function of rRNA in relation to an mRNA transcript?
What is the function of rRNA in relation to an mRNA transcript?
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It forms ribosomes and catalyzes peptide bond formation. Ribosomal RNA provides structure and catalytic function for translation.
It forms ribosomes and catalyzes peptide bond formation. Ribosomal RNA provides structure and catalytic function for translation.
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What is the function of tRNA in relation to an mRNA transcript?
What is the function of tRNA in relation to an mRNA transcript?
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It matches anticodons to codons and delivers amino acids. Transfer RNA bridges mRNA codons with specific amino acids.
It matches anticodons to codons and delivers amino acids. Transfer RNA bridges mRNA codons with specific amino acids.
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What is transcription in the context of gene expression and protein synthesis?
What is transcription in the context of gene expression and protein synthesis?
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Synthesis of RNA from a DNA template by RNA polymerase. First step of gene expression, creating RNA copy of DNA.
Synthesis of RNA from a DNA template by RNA polymerase. First step of gene expression, creating RNA copy of DNA.
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Which RNA type directly serves as the template for translation?
Which RNA type directly serves as the template for translation?
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mRNA. Messenger RNA carries genetic information to translation sites.
mRNA. Messenger RNA carries genetic information to translation sites.
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What is an intron?
What is an intron?
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A noncoding RNA segment removed from pre-mRNA. Non-coding sequences removed during RNA processing.
A noncoding RNA segment removed from pre-mRNA. Non-coding sequences removed during RNA processing.
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What is RNA splicing?
What is RNA splicing?
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Removal of introns and joining of exons in pre-mRNA. Processing step that removes introns from pre-mRNA.
Removal of introns and joining of exons in pre-mRNA. Processing step that removes introns from pre-mRNA.
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Which base in RNA pairs with guanine ($G$) on the DNA template during transcription?
Which base in RNA pairs with guanine ($G$) on the DNA template during transcription?
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Cytosine ($C$). Standard Watson-Crick base pairing rule for transcription.
Cytosine ($C$). Standard Watson-Crick base pairing rule for transcription.
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In which direction does RNA polymerase read the DNA template strand?
In which direction does RNA polymerase read the DNA template strand?
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In the $3'\rightarrow 5'$ direction. Template is read in opposite direction to RNA synthesis.
In the $3'\rightarrow 5'$ direction. Template is read in opposite direction to RNA synthesis.
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What is the role of a promoter in transcription?
What is the role of a promoter in transcription?
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DNA site where RNA polymerase binds to start transcription. Initiates transcription by providing binding site for polymerase.
DNA site where RNA polymerase binds to start transcription. Initiates transcription by providing binding site for polymerase.
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Which codon is the typical start codon on mRNA?
Which codon is the typical start codon on mRNA?
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AUG. Universal start signal for protein synthesis initiation.
AUG. Universal start signal for protein synthesis initiation.
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What is the main function of the poly-$A$ tail on eukaryotic mRNA?
What is the main function of the poly-$A$ tail on eukaryotic mRNA?
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Increases mRNA stability and aids nuclear export. Prevents degradation and facilitates nuclear export of mRNA.
Increases mRNA stability and aids nuclear export. Prevents degradation and facilitates nuclear export of mRNA.
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What is the primary product of transcription for a protein-coding gene in eukaryotes?
What is the primary product of transcription for a protein-coding gene in eukaryotes?
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Pre-mRNA (primary RNA transcript). Eukaryotes produce unprocessed RNA that requires modification.
Pre-mRNA (primary RNA transcript). Eukaryotes produce unprocessed RNA that requires modification.
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What is an exon?
What is an exon?
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A coding RNA segment retained in mature mRNA. Protein-coding sequences that remain in mature mRNA.
A coding RNA segment retained in mature mRNA. Protein-coding sequences that remain in mature mRNA.
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Which codons function as stop codons on mRNA?
Which codons function as stop codons on mRNA?
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UAA, UAG, UGA. Three codons that signal termination of protein synthesis.
UAA, UAG, UGA. Three codons that signal termination of protein synthesis.
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What is the template strand of DNA in transcription?
What is the template strand of DNA in transcription?
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The DNA strand read by RNA polymerase to build complementary RNA. Serves as the blueprint for RNA sequence synthesis.
The DNA strand read by RNA polymerase to build complementary RNA. Serves as the blueprint for RNA sequence synthesis.
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What is the primary product of transcription for a protein-coding gene in prokaryotes?
What is the primary product of transcription for a protein-coding gene in prokaryotes?
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mRNA. Prokaryotes lack RNA processing, making mature mRNA directly.
mRNA. Prokaryotes lack RNA processing, making mature mRNA directly.
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Which base in RNA pairs with cytosine ($C$) on the DNA template during transcription?
Which base in RNA pairs with cytosine ($C$) on the DNA template during transcription?
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Guanine ($G$). Standard Watson-Crick base pairing rule for transcription.
Guanine ($G$). Standard Watson-Crick base pairing rule for transcription.
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Which base in RNA pairs with thymine ($T$) on the DNA template during transcription?
Which base in RNA pairs with thymine ($T$) on the DNA template during transcription?
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Adenine ($A$). Standard Watson-Crick base pairing rule for transcription.
Adenine ($A$). Standard Watson-Crick base pairing rule for transcription.
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Identify the correct mRNA base added opposite a DNA template base $C$.
Identify the correct mRNA base added opposite a DNA template base $C$.
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G. Watson-Crick base pairing rules for transcription.
G. Watson-Crick base pairing rules for transcription.
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In which direction does RNA polymerase synthesize RNA?
In which direction does RNA polymerase synthesize RNA?
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In the $5'\rightarrow 3'$ direction. RNA is always synthesized from $5'$ to $3'$ end.
In the $5'\rightarrow 3'$ direction. RNA is always synthesized from $5'$ to $3'$ end.
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Which statement best distinguishes transcription from translation?
Which statement best distinguishes transcription from translation?
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Transcription makes RNA from DNA; translation makes protein from mRNA. Transcription and translation are distinct molecular processes.
Transcription makes RNA from DNA; translation makes protein from mRNA. Transcription and translation are distinct molecular processes.
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Which option best describes how prokaryotes link transcription and translation?
Which option best describes how prokaryotes link transcription and translation?
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They can occur simultaneously in the cytoplasm. Prokaryotic coupling allows immediate translation of nascent mRNA.
They can occur simultaneously in the cytoplasm. Prokaryotic coupling allows immediate translation of nascent mRNA.
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