AP Biology Flashcards: Transcription And Rna Processing

What this deck covers

This deck focuses on Transcription And Rna Processing, giving you a quick way to review the definitions, rules, and examples that matter most for AP Biology.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is RNA processing?

Answer: Modifications of pre-mRNA to mature mRNA. These modifications prepare mRNA for translation and nuclear export.

Flashcard 2: What is the role of silencers in transcription?

Answer: Decrease transcription levels. These regulatory sequences reduce gene expression when bound by repressors.

Flashcard 3: What are operons?

Answer: Clusters of genes under single promoter in prokaryotes. This organization allows coordinated expression of related genes.

Flashcard 4: What is the primary transcript in eukaryotic cells?

Answer: Pre-mRNA. This unprocessed RNA transcript contains both exons and introns.

Flashcard 5: Which sequence signals the start of transcription?

Answer: Promoter sequence. This regulatory sequence determines where transcription begins.

Flashcard 6: Identify the role of the terminator sequence in transcription.

Answer: Signals end of transcription. This sequence causes RNA polymerase to stop and release the transcript.

Flashcard 7: Which process ensures mRNA is mature before translation?

Answer: RNA processing. This quality control step removes introns and adds protective modifications.

Flashcard 8: Which enzyme is primarily responsible for transcription?

Answer: RNA polymerase. This enzyme reads DNA template and assembles RNA nucleotides into a strand.

Flashcard 9: What are introns?

Answer: Non-coding sequences in mRNA. These sequences are spliced out during mRNA processing.

Flashcard 10: Identify the process of mRNA export from nucleus.

Answer: Nuclear export. This transport mechanism moves processed mRNA to cytoplasm for translation.

Flashcard 11: What is the purpose of the 5' cap?

Answer: Protects mRNA from degradation. Prevents 5' exonuclease digestion and facilitates ribosome binding.

Flashcard 12: Which RNA molecule carries amino acids to ribosomes?

Answer: Transfer RNA (tRNA). These molecules have specific anticodons that match with mRNA codons.

Flashcard 13: What is the role of enhancers in transcription?

Answer: Increase transcription levels. These regulatory sequences boost gene expression when bound by activators.

Flashcard 14: What is a transcription factor?

Answer: Protein that regulates transcription. These regulatory proteins control gene expression by binding DNA.

Flashcard 15: What is the template strand in transcription?

Answer: DNA strand used to synthesize RNA. This antisense strand provides the pattern for complementary RNA synthesis.

Flashcard 16: Identify the process that converts a gene into mRNA.

Answer: Transcription. This is the first step in gene expression, creating RNA from DNA.

Flashcard 17: What is the function of mRNA?

Answer: Carries genetic information from DNA to ribosomes. Acts as an intermediate messenger between genes and protein synthesis.

Flashcard 18: What is the purpose of the 5' cap?

Answer: Protects mRNA from degradation. Prevents 5' exonuclease digestion and facilitates ribosome binding.

Flashcard 19: Which modification is added to the 5' end of eukaryotic mRNA?

Answer: 5' cap. This modified guanosine structure protects mRNA from degradation.

Flashcard 20: What is alternative splicing?

Answer: Production of different mRNA from the same transcript. This mechanism creates protein diversity by varying exon combinations.

Flashcard 21: What is a transcription factor?

Answer: Protein that regulates transcription. These regulatory proteins control gene expression by binding DNA.

Flashcard 22: What is transcription initiation complex?

Answer: Assemblage of transcription factors and RNA polymerase. This complex forms at promoters to begin RNA synthesis.

Flashcard 23: Identify the process of mRNA export from nucleus.

Answer: Nuclear export. This transport mechanism moves processed mRNA to cytoplasm for translation.

Flashcard 24: Which RNA molecule carries amino acids to ribosomes?

Answer: Transfer RNA (tRNA). These molecules have specific anticodons that match with mRNA codons.

Flashcard 25: Which modification is added to the 5' end of eukaryotic mRNA?

Answer: 5' cap. This modified guanosine structure protects mRNA from degradation.

Flashcard 26: What occurs during the elongation phase of transcription?

Answer: RNA polymerase synthesizes RNA strand. The polymerase moves along DNA, adding complementary RNA nucleotides.

Flashcard 27: What is the main purpose of transcription in cells?

Answer: To synthesize RNA from a DNA template. This process creates RNA copies of genetic information for protein synthesis.

Flashcard 28: What occurs during the elongation phase of transcription?

Answer: RNA polymerase synthesizes RNA strand. The polymerase moves along DNA, adding complementary RNA nucleotides.

Flashcard 29: Which type of RNA is involved in protein synthesis?

Answer: Ribosomal RNA (rRNA). This RNA forms the structural and catalytic core of ribosomes.

Flashcard 30: What is the template strand in transcription?

Answer: DNA strand used to synthesize RNA. This antisense strand provides the pattern for complementary RNA synthesis.

Flashcard 31: Which molecule forms the core of the spliceosome?

Answer: snRNA. Small nuclear RNA guides the splicing machinery to correct sites.

Flashcard 32: Identify the process that converts a gene into mRNA.

Answer: Transcription. This is the first step in gene expression, creating RNA from DNA.

Flashcard 33: What is the primary transcript in eukaryotic cells?

Answer: Pre-mRNA. This unprocessed RNA transcript contains both exons and introns.

Flashcard 34: What is alternative splicing?

Answer: Production of different mRNA from the same transcript. This mechanism creates protein diversity by varying exon combinations.

Flashcard 35: Identify the role of the terminator sequence in transcription.

Answer: Signals end of transcription. This sequence causes RNA polymerase to stop and release the transcript.

Flashcard 36: Identify the enzyme that adds the poly-A tail.

Answer: Poly-A polymerase. This enzyme extends the 3' end with multiple adenine nucleotides.

Flashcard 37: What is the role of silencers in transcription?

Answer: Decrease transcription levels. These regulatory sequences reduce gene expression when bound by repressors.

Flashcard 38: What is the role of snRNPs in RNA processing?

Answer: Participate in splicing by forming spliceosome. Small nuclear ribonucleoproteins recognize splice sites and catalyze splicing.

Flashcard 39: Which RNA base pairs with adenine in DNA?

Answer: Uracil. RNA uses uracil instead of thymine for base pairing with adenine.

Flashcard 40: What are operons?

Answer: Clusters of genes under single promoter in prokaryotes. This organization allows coordinated expression of related genes.

Flashcard 41: What is the role of enhancers in transcription?

Answer: Increase transcription levels. These regulatory sequences boost gene expression when bound by activators.

Flashcard 42: What is the role of ribonuclease in RNA processing?

Answer: Degrades RNA molecules. These enzymes cleave RNA during processing and quality control.

Flashcard 43: Which complex is responsible for RNA splicing?

Answer: Spliceosome. This ribonucleoprotein complex precisely cuts out intron sequences.

Flashcard 44: What is the role of ribonuclease in RNA processing?

Answer: Degrades RNA molecules. These enzymes cleave RNA during processing and quality control.

Flashcard 45: What is the main purpose of transcription in cells?

Answer: To synthesize RNA from a DNA template. This process creates RNA copies of genetic information for protein synthesis.

Flashcard 46: Which type of RNA is involved in protein synthesis?

Answer: Ribosomal RNA (rRNA). This RNA forms the structural and catalytic core of ribosomes.

Flashcard 47: Identify the enzyme that synthesizes the 5' cap.

Answer: Capping enzyme. This enzyme adds the protective 7-methylguanosine cap structure.

Flashcard 48: What is transcription initiation complex?

Answer: Assemblage of transcription factors and RNA polymerase. This complex forms at promoters to begin RNA synthesis.

Flashcard 49: What is the role of mediator proteins?

Answer: Bridge between transcription factors and RNA polymerase. These proteins coordinate transcriptional regulation by connecting factors.

Flashcard 50: What is the function of mRNA?

Answer: Carries genetic information from DNA to ribosomes. Acts as an intermediate messenger between genes and protein synthesis.

Flashcard 51: Identify the enzyme that unwinds DNA during transcription.

Answer: Helicase. This enzyme separates DNA strands to create the transcription bubble.

Flashcard 52: Which molecule forms the core of the spliceosome?

Answer: snRNA. Small nuclear RNA guides the splicing machinery to correct sites.

Flashcard 53: Which process ensures mRNA is mature before translation?

Answer: RNA processing. This quality control step removes introns and adds protective modifications.

Flashcard 54: What are exons?

Answer: Coding sequences in mRNA. These sequences remain in mature mRNA and code for proteins.

Flashcard 55: What stabilizes mRNA and assists in export to cytoplasm?

Answer: Poly-A tail. Also enhances mRNA stability and facilitates nuclear export.

Flashcard 56: What is the role of mediator proteins?

Answer: Bridge between transcription factors and RNA polymerase. These proteins coordinate transcriptional regulation by connecting factors.

Flashcard 57: What stabilizes mRNA and assists in export to cytoplasm?

Answer: Poly-A tail. Also enhances mRNA stability and facilitates nuclear export.

Flashcard 58: What is the role of snRNPs in RNA processing?

Answer: Participate in splicing by forming spliceosome. Small nuclear ribonucleoproteins recognize splice sites and catalyze splicing.

Flashcard 59: Which RNA base pairs with adenine in DNA?

Answer: Uracil. RNA uses uracil instead of thymine for base pairing with adenine.

Flashcard 60: What is RNA processing?

Answer: Modifications of pre-mRNA to mature mRNA. These modifications prepare mRNA for translation and nuclear export.

Flashcard 61: Identify the enzyme that adds the poly-A tail.

Answer: Poly-A polymerase. This enzyme extends the 3' end with multiple adenine nucleotides.

Flashcard 62: What are exons?

Answer: Coding sequences in mRNA. These sequences remain in mature mRNA and code for proteins.

Flashcard 63: Which sequence signals the start of transcription?

Answer: Promoter sequence. This regulatory sequence determines where transcription begins.