Comprehensive Pre-med style questions on DNA replication, S phase, enzymes, directionality, and regulation
Which event defines the S phase of the eukaryotic cell cycle?
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"DNA Replication & S Phase","questions":[{"prompt":"Which event defines the S phase of the eukaryotic cell cycle?","options":[{"label":"A","body":"Separation of sister chromatids","isCorrect":false},{"label":"B","body":"Synthesis and complete replication of the nuclear DNA","isCorrect":true},{"label":"C","body":"Rapid cell growth without DNA synthesis","isCorrect":false},{"label":"D","body":"Formation of the mitotic spindle","isCorrect":false},{"label":"E","body":"Partition of cytoplasm during cytokinesis","isCorrect":false}],"explanation":"During S phase, the entire nuclear genome is replicated so that each chromosome consists of two sister chromatids; chromatid separation occurs later in mitosis."},{"prompt":"DNA replication in cells is described as 'semi-conservative'. What does this mean?","options":[{"label":"A","body":"Each daughter DNA molecule contains two newly synthesised strands","isCorrect":false},{"label":"B","body":"Each daughter DNA molecule contains two parental (old) strands","isCorrect":false},{"label":"C","body":"Each daughter DNA molecule contains one parental strand and one newly synthesised strand","isCorrect":true},{"label":"D","body":"Only half of the genome is replicated in each cell cycle","isCorrect":false},{"label":"E","body":"Only some bases are copied accurately","isCorrect":false}],"explanation":"In semi-conservative replication, the two parental strands separate and each serves as a template for a new complementary strand, producing hybrids of one old and one new strand."},{"prompt":"During DNA replication, in which direction are new DNA strands synthesised by DNA polymerases?","options":[{"label":"A","body":"5' → 3' only","isCorrect":true},{"label":"B","body":"3' → 5' only","isCorrect":false},{"label":"C","body":"Either 5' → 3' or 3' → 5', depending on the strand","isCorrect":false},{"label":"D","body":"Randomly in both directions","isCorrect":false},{"label":"E","body":"Direction is not relevant for DNA synthesis","isCorrect":false}],"explanation":"All known DNA polymerases add nucleotides to a pre-existing 3' OH, so synthesis proceeds in the 5' → 3' direction along the growing strand while reading the template 3' → 5'."},{"prompt":"Which statement about DNA polymerase is CORRECT?","options":[{"label":"A","body":"It can initiate DNA synthesis de novo without a primer","isCorrect":false},{"label":"B","body":"It requires a free 3' OH group to extend a pre-existing strand","isCorrect":true},{"label":"C","body":"It synthesises RNA primers for DNA replication","isCorrect":false},{"label":"D","body":"It unwinds the DNA double helix ahead of the replication fork","isCorrect":false},{"label":"E","body":"It forms phosphodiester bonds only between ribonucleotides","isCorrect":false}],"explanation":"DNA polymerases cannot start synthesis de novo; they extend from a free 3' OH (usually supplied by an RNA primer) and add deoxyribonucleotides."},{"prompt":"What is the main role of DNA helicase at the replication fork?","options":[{"label":"A","body":"Relieving torsional strain by cutting and rejoining DNA","isCorrect":false},{"label":"B","body":"Synthesising short RNA primers","isCorrect":false},{"label":"C","body":"Unwinding the parental double helix by breaking hydrogen bonds between base pairs","isCorrect":true},{"label":"D","body":"Sealing nicks between Okazaki fragments","isCorrect":false},{"label":"E","body":"Holding single-stranded DNA in an extended conformation","isCorrect":false}],"explanation":"Helicase uses ATP to separate the two parental DNA strands ahead of the replication fork, allowing each to be used as a template."},{"prompt":"Single-strand DNA-binding proteins (SSBs) are essential during replication because they:","options":[{"label":"A","body":"Cut and rejoin DNA to relieve supercoiling","isCorrect":false},{"label":"B","body":"Stabilise unwound DNA strands and prevent them from reannealing or forming secondary structures","isCorrect":true},{"label":"C","body":"Create RNA primers for DNA polymerase","isCorrect":false},{"label":"D","body":"Proofread newly synthesised DNA and remove mismatches","isCorrect":false},{"label":"E","body":"Ligate Okazaki fragments together","isCorrect":false}],"explanation":"SSBs bind exposed single-stranded DNA and keep it from re-pairing or forming hairpins before replication can occur."},{"prompt":"Which enzyme synthesises the short RNA stretches that provide 3' ends for DNA polymerase to begin replication?","options":[{"label":"A","body":"DNA polymerase III","isCorrect":false},{"label":"B","body":"DNA ligase","isCorrect":false},{"label":"C","body":"Primase","isCorrect":true},{"label":"D","body":"Topoisomerase","isCorrect":false},{"label":"E","body":"Helicase","isCorrect":false}],"explanation":"Primase is an RNA polymerase that synthesises short RNA primers de novo, providing the 3' OH required by DNA polymerases."},{"prompt":"What is the role of DNA ligase in replication?","options":[{"label":"A","body":"Extending RNA primers with DNA","isCorrect":false},{"label":"B","body":"Joining Okazaki fragments by forming phosphodiester bonds between adjacent DNA fragments","isCorrect":true},{"label":"C","body":"Removing RNA primers from lagging strands","isCorrect":false},{"label":"D","body":"Unwinding the DNA helix","isCorrect":false},{"label":"E","body":"Adding methyl groups to newly synthesised DNA","isCorrect":false}],"explanation":"DNA ligase seals nicks in the sugar-phosphate backbone, particularly between adjacent Okazaki fragments on the lagging strand."},{"prompt":"Topoisomerases are crucial for DNA replication primarily because they:","options":[{"label":"A","body":"Add nucleotides to the growing DNA strand","isCorrect":false},{"label":"B","body":"Cut one or both DNA strands to relieve supercoiling ahead of the replication fork","isCorrect":true},{"label":"C","body":"Create RNA primers at the origin of replication","isCorrect":false},{"label":"D","body":"Protect single-stranded DNA from nucleases","isCorrect":false},{"label":"E","body":"Initiate transcription at promoters","isCorrect":false}],"explanation":"Helicase unwinding introduces positive supercoils; topoisomerases transiently break DNA strands, allowing the helix to relax and preventing fork stalling."},{"prompt":"Which statement correctly distinguishes leading and lagging strand synthesis at a replication fork?","options":[{"label":"A","body":"The leading strand is synthesised 3' → 5', the lagging strand 5' → 3'","isCorrect":false},{"label":"B","body":"The leading strand is synthesised continuously towards the replication fork; the lagging strand is synthesised discontinuously away from the fork","isCorrect":true},{"label":"C","body":"Both leading and lagging strands are synthesised continuously","isCorrect":false},{"label":"D","body":"Both leading and lagging strands require only one RNA primer","isCorrect":false},{"label":"E","body":"The leading strand does not need a primer, but the lagging strand does","isCorrect":false}],"explanation":"Because DNA polymerase can only add nucleotides 5' → 3', one new strand (leading) is continuous, whereas the other (lagging) is made in Okazaki fragments laid down away from the fork."},{"prompt":"Okazaki fragments are:","options":[{"label":"A","body":"Short RNA pieces made on the leading strand","isCorrect":false},{"label":"B","body":"Short DNA fragments synthesised on the lagging strand","isCorrect":true},{"label":"C","body":"Regions of DNA enriched in guanine and cytosine","isCorrect":false},{"label":"D","body":"Sections of DNA that are not replicated in S phase","isCorrect":false},{"label":"E","body":"Short RNA-DNA hybrids found only in prokaryotes","isCorrect":false}],"explanation":"On the lagging strand, DNA is synthesised in short 5' → 3' stretches called Okazaki fragments that are later joined by ligase."},{"prompt":"Why are multiple RNA primers required specifically on the lagging strand during replication?","options":[{"label":"A","body":"The lagging strand DNA polymerase is unable to bind DNA directly","isCorrect":false},{"label":"B","body":"The lagging strand is synthesised discontinuously, so each Okazaki fragment must be initiated by its own primer","isCorrect":true},{"label":"C","body":"The lagging strand is synthesised 3' → 5', requiring primers at both ends","isCorrect":false},{"label":"D","body":"Primers on the lagging strand are not later removed","isCorrect":false},{"label":"E","body":"Primers on the leading strand are unnecessary because synthesis starts at a telomere","isCorrect":false}],"explanation":"Each Okazaki fragment on the lagging strand requires a new starting point for DNA polymerase, supplied by a fresh RNA primer."},{"prompt":"In bacteria (e.g. E. coli), which DNA polymerase is primarily responsible for bulk synthesis of new DNA on both leading and lagging strands?","options":[{"label":"A","body":"DNA polymerase I","isCorrect":false},{"label":"B","body":"DNA polymerase III","isCorrect":true},{"label":"C","body":"DNA polymerase α","isCorrect":false},{"label":"D","body":"DNA polymerase δ","isCorrect":false},{"label":"E","body":"Reverse transcriptase","isCorrect":false}],"explanation":"In bacteria, DNA polymerase III is the main replicative polymerase; DNA polymerase I removes RNA primers and fills short gaps."},{"prompt":"Which is the primary function of bacterial DNA polymerase I during DNA replication?","options":[{"label":"A","body":"Initiating DNA synthesis at replication origins","isCorrect":false},{"label":"B","body":"Removing RNA primers with its 5' → 3' exonuclease activity and replacing them with DNA","isCorrect":true},{"label":"C","body":"Synthesising the leading strand continuously","isCorrect":false},{"label":"D","body":"Unwinding DNA at the replication fork","isCorrect":false},{"label":"E","body":"Joining Okazaki fragments with phosphodiester bonds","isCorrect":false}],"explanation":"DNA polymerase I in bacteria uses its 5' → 3' exonuclease to remove RNA primers and then fills in the resulting gaps with DNA."},{"prompt":"In eukaryotes, which combination of DNA polymerases is most closely associated with replication of nuclear DNA on the leading and lagging strands?","options":[{"label":"A","body":"Pol α for both strands","isCorrect":false},{"label":"B","body":"Pol α as the main replicative polymerase and Pol β as primase","isCorrect":false},{"label":"C","body":"Pol α–primase to start synthesis, then Pol ε mainly on the leading strand and Pol δ mainly on the lagging strand","isCorrect":true},{"label":"D","body":"Pol γ on both strands in the nucleus","isCorrect":false},{"label":"E","body":"Pol δ for mitochondrial DNA and Pol ε for nuclear DNA","isCorrect":false}],"explanation":"Eukaryotic replication typically uses the Pol α–primase complex to lay down RNA–DNA primers, Pol ε for continuous leading-strand synthesis, and Pol δ for lagging-strand Okazaki fragments."},{"prompt":"What is the function of the sliding clamp (β clamp in bacteria, PCNA in eukaryotes) in DNA replication?","options":[{"label":"A","body":"It unwinds the DNA double helix","isCorrect":false},{"label":"B","body":"It loads RNA primers onto the DNA template","isCorrect":false},{"label":"C","body":"It holds DNA polymerase tightly to DNA, greatly increasing processivity","isCorrect":true},{"label":"D","body":"It seals nicks between DNA fragments","isCorrect":false},{"label":"E","body":"It cuts and rejoins DNA to relieve supercoiling","isCorrect":false}],"explanation":"Sliding clamps encircle DNA and tether DNA polymerases, allowing long stretches of synthesis without dissociating."},{"prompt":"Many replicative DNA polymerases possess a 3' → 5' exonuclease activity. What is its main role?","options":[{"label":"A","body":"Removing RNA primers from Okazaki fragments","isCorrect":false},{"label":"B","body":"Proofreading: removing incorrectly paired nucleotides from the 3' end of the growing strand","isCorrect":true},{"label":"C","body":"Extending the DNA chain beyond the 3' end","isCorrect":false},{"label":"D","body":"Repairing double-strand breaks","isCorrect":false},{"label":"E","body":"Adding telomeric repeats to chromosome ends","isCorrect":false}],"explanation":"3' → 5' exonuclease activity allows polymerases to remove misincorporated nucleotides immediately, increasing fidelity."},{"prompt":"Telomerase helps solve which specific problem in DNA replication?","options":[{"label":"A","body":"Replication of circular bacterial chromosomes","isCorrect":false},{"label":"B","body":"Replication of the very ends of linear chromosomes on the lagging strand","isCorrect":true},{"label":"C","body":"Removal of RNA primers from Okazaki fragments","isCorrect":false},{"label":"D","body":"Unwinding of the double helix","isCorrect":false},{"label":"E","body":"Random introduction of mutations into telomeric DNA","isCorrect":false}],"explanation":"Because lagging-strand synthesis cannot fully replicate the 5' ends of linear chromosomes, telomerase extends the 3' overhang with repeats so that no essential genetic information is lost."},{"prompt":"Which cells typically show the highest telomerase activity in humans under normal physiological conditions?","options":[{"label":"A","body":"Most differentiated somatic cells (e.g. neurons)","isCorrect":false},{"label":"B","body":"Germ-line cells and many stem cells","isCorrect":true},{"label":"C","body":"Red blood cells","isCorrect":false},{"label":"D","body":"All cells in G0 phase only","isCorrect":false},{"label":"E","body":"Only cancer cells","isCorrect":false}],"explanation":"High telomerase activity is typical in germ-line cells and some stem cells, maintaining telomere length; many cancer cells also reactivate telomerase."},{"prompt":"Which statement correctly compares DNA replication origins in prokaryotes and eukaryotes?","options":[{"label":"A","body":"Both typically have a single origin per chromosome","isCorrect":false},{"label":"B","body":"Prokaryotic chromosomes have many origins; eukaryotic chromosomes have only one","isCorrect":false},{"label":"C","body":"Circular bacterial chromosomes usually have one main origin, whereas linear eukaryotic chromosomes have many origins","isCorrect":true},{"label":"D","body":"Only eukaryotes use origins; prokaryotic replication starts randomly","isCorrect":false},{"label":"E","body":"Origins are required only for lagging-strand synthesis","isCorrect":false}],"explanation":"Bacteria like E. coli typically initiate replication at a single oriC, while large eukaryotic chromosomes use multiple origins to complete replication efficiently."}]}"
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