Unit 6 Gene Expression and Regulation 词汇题
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50 questions
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- Q1Which of the following cell types lacks a membrane‐bound nucleus?Cells with membrane‐bound organellesCells without a true nucleusCells with linear chromosomes30s
- Q2Which feature is characteristic of eukaryotic cells?Single circular chromosomeMultiple linear chromosomesLack of organellesPlasmid‐based genome30s
- Q3What structure carries genetic information in eukaryotic cells?OperonChromosomeRibosomePlasmid30s
- Q4Which of the following is a small, circular DNA molecule often found in bacteria?PlasmidRibosomeChromosomeOperon30s
- Q5What is the basic building block of nucleic acids composed of a sugar, phosphate, and base?Fatty acidNucleotideMonosaccharideAmino acid30s
- Q6Which nitrogenous base category has a double‐ring structure?NucleotidePyrimidinePurineBase pair30s
- Q7Which term describes a single‐ring nitrogenous base found in DNA and RNA?PurineRibosePyrimidineNucleotide30s
- Q8Which principle describes how adenine pairs with thymine and guanine pairs with cytosine?DNA replicationBase pairingChromosomal segregationGenetic recombination30s
- Q9What is the process by which a cell copies its DNA before division?TranslationDNA replicationTranscriptionTranslocation30s
- Q10Which model of DNA replication yields one original and one new strand per daughter molecule?Post‐replication repairDispersive replicationSemiconservative replicationConservative replication30s
- Q11Which enzyme unwinds the DNA helix at the replication fork?TopoisomeraseLigaseDNA polymeraseHelicase30s
- Q12Which enzyme relieves supercoiling tension during DNA replication?LigaseRNA polymeraseHelicaseTopoisomerase30s
- Q13What short RNA segment provides a starting point for DNA polymerase?Polynucleotide tailOkazaki fragmentDNA primerRNA primer30s
- Q14Which enzyme synthesizes new DNA strands by adding nucleotides to a primer?HelicaseDNA polymeraseLigasePrimase30s
- Q15Which enzyme joins Okazaki fragments on the lagging strand?HelicaseTopoisomerasePolymeraseLigase30s