solved Question 10.25 PointsA cell is dividing by binary fission. What

Question 10.25 PointsA cell is dividing by binary fission. What can you conclude?Mitosis has taken place without cytokinesis.Homologous chromosomes have already paired.The cell is prokaryotic.The cyclin-Cdk complex is no longer phosphorylating enzymes.The cell cycle is out of control.Question 20.25 PointsPlant hormones known as ____ stimulate mitosis.growth factorscohesinscytokininsscaffolding proteinscyclinsQuestion 30.25 PointsTo prevent disastrous consequences, the eukaryotic cell cycle is controlled by:replication.a very detailed, rigid genetic program.the mitochondria.a series of cell cycle checkpoints.environmental signals.Question 40.25 PointsWhat would happen if meiosis did not occur in sexually reproducing organisms?The growth of the zygote would be halted.The gametes would remain haploid.The eggs would be haploid, but the sperm would be diploid.Mitosis would be sufficient to produce haploid gametes.The chromosome number would double in each generation.Question 50.25 PointsA bacterial chromosome consists of a:linear DNA molecule many times larger than the cell.circular DNA molecule smaller than the cell.linear or circular DNA molecule smaller than the cell.linear DNA molecule smaller than the cell.circular DNA molecule many times larger than the cell.Question 60.25 PointsChromosomes are duplicated during the ____ of the cell cycle.prophaseS phasemetaphaseG2 phaseG1 phaseQuestion 70.25 PointsWhen is a cell in metaphase?The chromosome are separated into distinct groups at opposite poles of the cell.Cytokinesis is occurring.The chromosomes are aligned at the midplane of the cell.The chromosomes are visible as threadlike structures.The nuclear envelope is clearly visible.Question 80.25 PointsEukaryotic chromosomes consist of:linear DNA molecules complexed with positively charged histone proteins.circular DNA molecules complexed with negatively charged histone proteins.circular DNA molecules folded to fit inside a bacterial cell.linear DNA molecules complexed with negatively charged histone proteins.circular DNA molecules complexed with positively charged nonhistone proteins.Question 90.25 PointsDuring which stage of meiosis do the sister chromatids separate?anaphase Imetaphase IIanaphase IImetaphase Itelophase IIQuestion 100.25 PointsChromosomes are duplicated during the ____ of the cell cycle.G2 phasemetaphaseprophaseS phaseG1 phaseQuestion 110.25 PointsA cell is dividing by binary fission. What can you conclude?The cell is prokaryotic.The cyclin-Cdk complex is no longer phosphorylating enzymes.Mitosis has taken place without cytokinesis.The cell cycle is out of control.Homologous chromosomes have already paired.Question 120.25 PointsIn a human cell at prophase I, there are ____ tetrads.23429246Question 130.25 PointsA cell in the G2 phase:has visibly distinct chromosomes.is in mitosis.has twice the amount of DNA present in a telophase nucleus.is in cytokinesis.lacks a visible nuclear membrane.Question 140.25 PointsA cell in the G2 phase:is in mitosis.lacks a visible nuclear membrane.is in cytokinesis.has twice the amount of DNA present in a telophase nucleus.has visibly distinct chromosomes.Question 150.25 Points____ organized on chromosomes carry the information that controls the functions of the cell.NucleosomesProteinsAstersHistonesGenesQuestion 160.25 PointsA nucleosome consists of DNA wrapped around scaffolding proteins.__________________TrueFalseQuestion 170.25 PointsGametophyte plants produce gametes using:fertilization.meiosis.sporogenesis.polyploidy.mitosis.Question 180.25 Points____ organized on chromosomes carry the information that controls the functions of the cell.NucleosomesProteinsHistonesAstersGenesQuestion 190.25 PointsIn fungi and protists, gametes produced by ____ of haploid cells fuse to form a ____ zygote, which then undergoes ____ to restore the haploid chromosome number.meiosis, diploid, mitosismitosis, haploid, meiosismeiosis, haploid, mitosismitosis, diploid, mitosismitosis, diploid, meiosisQuestion 200.25 PointsHomologous chromosomes can be identified and/or characterized by:paternal chromosomes only.maternal chromosomes only.their similar and characteristic staining patterns.the different centromere positions in the maternal vs. paternal chromosomes.those chromosomes that do not have partners.Question 210.25 PointsWhich event occurs in prophase II?formation of the cleavage furrowdisappearance of the spindlecondensation of the chromatin into chromosomesformation of the chiasmatacrossing over occurs.Question 220.25 PointsCytokinesis in animal cells involves contraction of a ring of ____ microfilaments.cyclin plus myosintubulin plus actincohesin plus actinactin plus myosincyclin plus actinQuestion 230.25 PointsEukaryotic chromosomes are composed of:proteins only.DNA only.circular chromatin.karyotypes.chromatin.Question 240.25 PointsWhat is the function of kinetochores?Kinetochores attach to microtubules during mitosis.Kinetochores are involved in cytokinesis.Kinetochores regulate the length of the cell cycle.Kinetochores are the site of DNA synthesis.Kinetochores anchor spindle fibers to the centrioles.Question 250.25 PointsHomologous chromosomes undergo synapsis during:anaphase II.prophase I.telophase II.prophase II.anaphase I.Question 260.25 PointsAn animal with a diploid number of 36 chromosomes will have ____ chromosomes in its gametes and ____ chromosomes in its somatic cells.36; 1836; 3618; 1836; 7218; 36Question 270.25 PointsIn unwound chromatin, nucleosomes are organized into large coiled loops held together by:scaffolding proteins.histones.centromeres.kinetochore proteins.condensins.Question 280.25 PointsIn a prometaphase cell, the:spindle fibers pull chromosomes to opposite sides of the cell.duplicated chromosomes become visible with the light microscope.nucleolus disappears.nuclear envelope is visible with the light microscope.mitotic spindle is beginning to assemble.Question 290.25 Points____ contain identical DNA sequences and are held together by ____ during mitosis.Sister chromatids; spindle fibersSister chromatids; cohesin proteinsDaughter chromosomes; hydrogen bondingDaughter chromosomes; ionic bondingSister chromosomes; histone proteinsQuestion 300.25 PointsWhich of the following is produced by meiosis?diploid cellssomatic cellszygotespolyploid cellsanimal gametesQuestion 310.25 Points____ contain identical DNA sequences and are held together by ____ during mitosis.Daughter chromosomes; hydrogen bondingSister chromatids; cohesin proteinsSister chromatids; spindle fibersDaughter chromosomes; ionic bondingSister chromosomes; histone proteinsQuestion 320.25 PointsThe ____ is responsible for the separation of the chromosomes during the ____ of mitosis.kinetochore; prophasecell wall; anaphasecentromere; telophasemitotic spindle; interphasemitotic spindle; anaphaseQuestion 330.25 PointsOnce nerve cells become mature, they do not typically undergo cell division. Based on your knowledge of the cell cycle, you might predict that mature nerve cells become arrested in the ____ of the cell cycle.G0 phaseS phaseG1 phaseG2 phaseprophaseQuestion 340.25 PointsA pair of centrioles is found at the center of the microtubule-organizing center in plant cells.__________________TrueFalseQuestion 350.25 PointsOnce nerve cells become mature, they do not typically undergo cell division. Based on your knowledge of the cell cycle, you might predict that mature nerve cells become arrested in the ____ of the cell cycle.G1 phaseS phaseG2 phaseG0 phaseprophaseQuestion 360.25 PointsA bacterial chromosome consists of a:linear DNA molecule smaller than the cell.linear DNA molecule many times larger than the cell.circular DNA molecule smaller than the cell.circular DNA molecule many times larger than the cell.linear or circular DNA molecule smaller than the cell.Question 370.25 PointsTo control the cell cycle:M-Cdk inhibits mitosis.cyclins fluctuate during the cell cycle.the activity of Cdks stays the same throughout the cell cycle.the anaphase-promoting complex stimulates DNA replication.Cdks are active only when they are released from cyclins.Question 380.25 PointsWhat evolutionary advantage is provided by sexual reproduction?production of genetically identical offspringmaking polyploidy possiblemaking clonesremoval of all genetic mutationsincreased genetic diversityQuestion 390.25 PointsAn animal with a diploid number of 36 chromosomes will have ____ chromosomes in its gametes and ____ chromosomes in its somatic cells.36; 7236; 3618; 1836; 1818; 36Question 400.25 PointsNucleosomes are best described as:prokaryotic DNA associated with histone proteins.eukaryotic DNA associated with scaffolding proteins.prokaryotic DNA associated with nonhistone proteins.eukaryotic DNA associated with histone proteins.eukaryotic DNA associated with nonhistone proteins.