BIOLOGY UNIT 3 REVIEW

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study Genetic processes

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BIOLOGY UNIT 3 REVIEW


BIOLOGY UNIT 3 REVIEWVersión en línea study Genetic processes por Wafiq 1 During DNA replication, which enzyme is responsible for relieving the tension caused by the unwinding of the double helix? a DNA Helicase b Topoisomerase c DNA Polymerase III d DNA Ligase 2 If a DNA sample contains 20% Guanine, what is the expected percentage of Adenine based on Chargaff’s Rule a 20% b 30% c 80% d 30% 3 In which direction does RNA Polymerase read the template strand, and in which direction is the mRNA transcript synthesized? a Reads 3' to 5'; Synthesizes 5' to 3' b Reads 5' to 3'; Synthesizes 3' to 5' c Reads 3' to 5'; Synthesizes 3' to 5' d Reads 5' to 3'; Synthesizes 5' to 3' 4 What is the role of the "A-site" (Aminoacyl site) within a ribosome during translation a It holds the growing polypeptide chain. b It is where the tRNA exits the ribosome. c It is the site where the incoming aminoacyl-tRNA binds. d It is where the mRNA first binds to the small ribosomal subunit. 5 . A mutation occurs where a single nucleotide is inserted into the middle of a coding sequence. This will most likely a A silent mutation. b A missense mutation that changes only one amino acid. c A nonsense mutation that creates a premature stop codon. d A frameshift mutation affecting all downstream amino acids 6 In the lac operon, what happens when lactose is present in the environment? a The repressor binds to the operator, turning the gene OFF. b Lactose binds to the repressor, preventing it from binding to the operator. c RNA polymerase is blocked from binding to the promoter. d lac operon levels drop, preventing transcription. 7 . Which of the following is a post-transcriptional modification unique to eukaryotes? Choose one or more answers a The binding of a sigma factor to the promoter. b The removal of exons and splicing of introns. c The immediate binding of ribosomes to the mRNA. d The addition of a 5' g cap and a 3' poly-A tail. 8 During Gel Electrophoresis, DNA fragments migrate toward the positive electrode (anode) because a A) DNA is positively charged b DNA is negatively charged c The gel is naturally attracted to hydrogen bonds. d Smaller fragments are more positively charged than larger fragments. 9 What is the primary function of DNA Polymerase I during replication? a Synthesizing the leading strand. b Removing RNA primers and replacing them with DNA nucleotides. c Linking Okazaki fragments together. d Unzipping the hydrogen bonds between base pairs. 10 In the Polymerase Chain Reaction (PCR), why is a heat-stable DNA polymerase (like Taq polymerase) required? a It works faster than human DNA polymerase b It prevents the DNA from re-annealing during the cooling phase. c It can withstand the high temperatures needed to denature the DNA strands. d It is the only enzyme that can recognize synthetic primers.

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BIOLOGY UNIT 3 REVIEW

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BIOLOGY UNIT 3 REVIEWVersión en línea

por Wafiq

During DNA replication, which enzyme is responsible for relieving the tension caused by the unwinding of the double helix?

If a DNA sample contains 20% Guanine, what is the expected percentage of Adenine based on Chargaff’s Rule

In which direction does RNA Polymerase read the template strand, and in which direction is the mRNA transcript synthesized?

What is the role of the "A-site" (Aminoacyl site) within a ribosome during translation

. A mutation occurs where a single nucleotide is inserted into the middle of a coding sequence. This will most likely

In the lac operon, what happens when lactose is present in the environment?

. Which of the following is a post-transcriptional modification unique to eukaryotes?

Choose one or more answers

During Gel Electrophoresis, DNA fragments migrate toward the positive electrode (anode) because

What is the primary function of DNA Polymerase I during replication?

In the Polymerase Chain Reaction (PCR), why is a heat-stable DNA polymerase (like Taq polymerase) required?