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Bio Chapter 10 Quiz

QuestionAnswer
A diploid cell has ____ the number of chromosomes as a haploid cell. one-fourth half twice four ties twice
An organism's traits are determined by the specific combination of inherited ____. cells genes proteins chromatids genes
The first level of DNA organization in a eukaryotic cell is maintained by which molecule? cohesin condensin chromatin histone histone
Identical copies of chromatin held together by cohesin at the centromere are called ___. histones nucleosomes chromatin sister chromatids sister chromatids
Chromosomes are duplicated during what stage of the cell cycle? G1 phase S phase prophase prometphase S phase
Which of the following events does not occur during some stages of interphase? DNA duplication organelle duplication increase in cell size separation of sister chromatids separation of sister chromatids
The mitotic spindles arise from which cell structure? centromere centrosome kinetochore cleavage furrow centrosome
Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which stage of mitosis? prophase prometaphase metaphase anaphase prometaphase
Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of which stage of mitosis? prometaphase metaphase anaphase telophase telophase
Separation of the sister chromatids is a characteristic of which stage of mitosis? prometaphase metaphase anaphase telophase anaphase
The chromosomes become visible under a light microscope during which stage of mitosis? prophase prometaphase metaphase anaphase prophase
The fusing of Golgi vesicles at the metaphase plate of dividing plant cells forms what structure? cell plate actin ring cleavage furrow mitotic spindle cell plate
At which of the cell cycle checkpoints do external forces have the greatest influence? G1 checkpoint G2 checkpoint M checkpoint G0 checkpoint G1 checkpoint
What is the main prerequisite for clearance at the G2 checkpoint? cell has reached a sufficient size an adequate stockpile of nucleotides accurate and complete DNA replication proper attachment of mitotic spindle fibers to kinetochores accurate and complete DNA replication
If the M checkpoint is not cleared, what stage of mitosis will be blocked? prophase prometaphase metaphase anaphase anaphase
Which protein is a positive regulator that phosphorylates other proteins when activated? p53 retinoblastoma protein (Rb) cyclin cyclin-dependent kinase (Cdk) cyclin-dependent kinase (Cdk)
Many of the negative regulator proteins of the cell cycle were discovered in what type of cells? gametes cells in G0 cancer cells stem cells cancer cells
Which negative regulatory molecule can trigger cell suicide (apoptosis) if vital cell cycle events do not occur? p53 p21 retinoblastoma protein (Rb) cyclin-dependent kinase (Cdk) p53
_____ are changes to the order of nucleotides in a segment of DNA that codes for a protein. Proto-oncogenes Tumor suppressor genes Gene mutation Negative regulators Gene mutations
A gene that codes for a positive cell cycle regulator is called a(n) ____. kinase inhibitor tumor suppressor gene proto-oncogene oncogen proto-oncogene
A mutated gene that codes for an altered version of Cdk that is active in the absence of cyclin is a(n) _____. kinase inhibitor tumor suppressor gene proto-oncogene oncogene oncogene
Which molecule is a Cdk inhibitor that is controlled by p53? cyclin anti-kinase Rb p21 p21
Which eukaryotic cell cycle event is missing in binary fission? cell growth DNA duplication karyokinesis cytokinesis karyokinesis
FtsZ proteins direct the formation of a ____ that will eventually form the new cell walls of the daughter cells. contractile ring cell plate cytoskeleton septum cell plate
Created by: mortehay000
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