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Chemistry LibreTexts

11.05 Week 11 Quiz

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  • cc_profilecc.exam.v0p1qmd_assessmenttypeExaminationqmd_scoretypePercentagecc_maxattempts1
    cc_profilecc.multiple_choice.v0p1The four types of nucleotides that make up DNA are named for theirhydrogen bonds.nitrogen-containing bases.phosphate groups.ring-shaped sugars.2100cc_profilecc.multiple_choice.v0p1Which of the following DNA sequences is complementary to the base sequence ACCGTAT?GTTACGCUCCGTATTGGCATACAATGCG7100cc_profilecc.multiple_choice.v0p1Combining the work of other scientists with their own research, Watson and Crick discovered that two strands of DNA join together to form a(n)nucleotide.X in a circle.double helix.covalent bond.11100cc_profilecc.multiple_choice.v0p1What holds base pairs together?hydrogen bondssugar-phosphate backbonespairs of double-ringed nucleotidesnitrogen-carbon bonds13100cc_profilecc.multiple_choice.v0p1The process that makes an exact copy of a cell's DNA is calledconservation.preservation.replication.synthesis.19100cc_profilecc.multiple_choice.v0p1What are the main functions of DNA polymerase?breaks hydrogen bonds and exposes basesholds DNA strands apart and attracts baseszips and unzips the double-stranded DNAbinds nucleotides and corrects base pair errors24100cc_profilecc.multiple_choice.v0p1Which of the following events occurs directly after a DNA molecule is unzipped?Mismatched nucleotide bases are identified and replaced.Free-floating nucleotides pair up with exposed bases.Identical double-stranded DNA molecules are formed.Enzymes break hydrogen bonds between base pairs.26100cc_profilecc.multiple_choice.v0p1When new DNA molecules are formed, almost all errors are detected and fixed bythe correct nucleotide.the sugar-phosphate backbone.DNA DNA strand.31100cc_profilecc.multiple_choice.v0p1The central dogma of molecular biology states that information flows in one direction fromnuclei to RNA to cytoplasm.ribosomes to proteins to DNA.genes to nuclei to ribosomes.DNA to RNA to proteins.36100cc_profilecc.multiple_choice.v0p1Choose the nucleotide sequence of the RNA strand that would be complementary to the following DNA strand: GTAGTCA.UATUAGAACGACTGCAUCAGUCATCAGT39100cc_profilecc.multiple_choice.v0p1The main function of tRNA is tocarry a message that, when translated, forms proteins.form a portion of ribosomes, a cell's protein factories.string together complementary RNA and DNA strands.bring amino acids from the cytoplasm to the ribosomes.44100cc_profilecc.multiple_choice.v0p1Which of the following events occurs directly after RNA polymerase recognizes the transcription start site of a gene?The polymerase strings amino acids into a polypeptide.Free-floating nucleotides pair up with exposed DNA bases.A complementary RNA strand detaches itself from the DNA.The DNA strand begins to unwind, separating the two strands.48100cc_profilecc.multiple_choice.v0p1A primary difference between transcription and replication is that transcriptionhappens repeatedly throughout a single cell cycle.occurs within the nucleus of eukaryotic catalyzed by large and complex enzymes.proceeds according to careful cellular control.49100cc_profilecc.multiple_choice.v0p1What is the term for a three-nucleotide sequence that codes for an amino acid?basecodonamineserine54100cc_profilecc.multiple_choice.v0p1How many amino acids are used to make up the all of the proteins in the human body?1620234658100cc_profilecc.multiple_choice.v0p1Which phrase best describes translation?converts mRNA into a polypeptidecatalyzes bonds between amino acidsproduces RNA from DNA moleculesrecycles tRNA molecules for reuse61100cc_profilecc.multiple_choice.v0p1Which of the following is the site of translation?vacuolelysosomenucleusribosome68100cc_profilecc.multiple_choice.v0p1In prokaryotes, gene expression is regulated by controllingtranscription.replication.translation.processing.69100cc_profilecc.multiple_choice.v0p1The bacterial <i>lac</i> operon is switched on whenthe operator binds to the promoter.lactose binds to the lac operator.the operator binds to the lac genes.lactose binds to the lac repressor.76100cc_profilecc.multiple_choice.v0p1In a eukaryotic cell, where does mRNA processing take place?cytoplasmnucleusribosomeoperator78100cc_profilecc.multiple_choice.v0p1What is the term for the nucleotide sequences that are removed during mRNA processing?operatorspromotersexonsintrons84100cc_profilecc.multiple_choice.v0p1What is the main function of a promoter?codes for enzymes that break down sugarblocks the action of RNA polymerasetells RNA polymerase where to startkeeps eukaryote genes permanently "off"87100cc_profilecc.multiple_choice.v0p1Generally, mutations that affect a single gene occur duringtranscription.replication.translation.operation.90100cc_profilecc.multiple_choice.v0p1Cystic fibrosis is an example of a genetic disease caused by the deletion of a nucleotide. What is the term for this type of mutation?translocationchromosomalsingle-geneframeshift96100cc_profilecc.multiple_choice.v0p1<p>Mutations that can affect the offspring of an organism occur in what cell type?</p>bodysexbloodbrain98100cc_profilecc.multiple_choice.v0p1Which of the following is an example of a mutagen?repair enzymetriglycerideUV sunlightthymine103100