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Post-Test
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1
Chromosomes that are derived from a similar ancestor and are similar in size, banding pattern and composition of genetic material are known as
A)sex chromosomes.
B)homologues.
C)autosomes.
D)gametes.
E)diploid.
2
Which of the following events does not occur during M-phase of the cell cycle?
A)Nuclear division
B)Chromosome separation
C)Cytoplasmic division
D)Cell growth
E)Nuclear division and cytoplasmic division
3
The process by which haploid cells are produced from a cell that was originally diploid is most accurately referred to as
A)asexual reproduction.
B)mitosis.
C)meiosis.
D)cytokinesis.
E)fertilization.
4
True or False: During cytokinesis, plant cells form a cleavage furrow and animal cells form a cell plate.
A)True
B)False
5
Which of the following functions is not performed by the 20 conserved proteins responsible for cytokinesis?
A)Separation of daughter cells via membrane insertion
B)Binding of central spindle
C)Initiation of contractile ring formation via RhoA signal transduction pathway
D)Reformation of nuclear membrane
E)Completion of contractile ring to form cleavage furrow
6
True or False: The number of cross-over events varies depending on the species and the size of the chromosome.
A)True
B)False
7
During which of the following phases of meiosis do homologous chromosomes separate resulting in sister chromatids at each pole?
A)Anaphase I
B)Anaphase II
C)Metaphase I
D)Metaphase II
E)Telophase II
8
During which phase of the cell cycle is gene expression least likely to be observed?
A)S-phase
B)G1
C)G2
D)M-phase
E)Gene expression and protein synthesis are equally likely in all phases of the cell cycle.
9
A diploid organism which has 12 chromosomes in its somatic cells would have how many chromosomes in its gametes?
A)2
B)6
C)12
D)24
E)48
10
Following DNA replication, the identical copies of the original double helix are referred to as ________ and are tightly associated at the ________.
A)homologous chromosomes; centromere
B)sister chromatids; telomeres
C)sister chromatids; centromere
D)homologous chromosomes; kinetochore
E)sister chromatids; centrosome
11
True or False: Kinetochore microtubules attach a pair of sister chromatids to both poles during mitosis and to only one pole during meiosis.
A)True
B)False
12
True or False: Not all eukaryotic species require a pair of centrioles in a centrosome for proper spindle formation.
A)True
B)False
13
During mitosis, the "capturing" of sister chromatids by microtubules growing from each pole is most accurately occurring in
A)prophase.
B)prometaphase.
C)metaphase.
D)anaphase.
E)telophase.
14
Which of the following statements about crossing over is correct?
A)Crossing over is common to both meiosis and mitosis.
B)Crossing over typically occurs during Metaphase II.
C)Chiasmata are formed when segments of DNA are exchanged between sister chromatids.
D)After crossing over, the arms of the chromosomes remain fully attached at the synaptonemal complex.
E)The number of crossing over events differs among species, but is a carefully regulated process.
15
True or False: Mitosis contributes significantly to genetic diversity.
A)True
B)False
16
True or False: DNA replication between Meiosis I and Meiosis II ensures that the gametes receive a full complement of the genome prior to fertilization.
A)True
B)False
17
A diploid species in which haploid gametes are a specialized cell used for sexual reproduction is most accurately referred to as a
A)gametophyte.
B)sporophyte.
C)haploid dominant.
D)diploid recessive.
E)diploid dominant.
18
Which of the following forms of mutation does not alter chromosome structure?
A)Inversion
B)Deletion
C)Duplication
D)Translocation
E)All of these forms of mutations can alter chromosome structure
19
True or False: Nondisjunction refers to an event in which the chromosomes do not sort properly during cell division.
A)True
B)False
20
Which of the following statements about changes in chromosome number is incorrect?
A)Aneuploidy typically has detrimental consequences regardless of the eukaryotic species.
B)Male bees are haploid, while female bees are diploid.
C)Polyploid strains of plants commonly are larger and more robust.
D)Cells in a human affected with Down Syndrome produce 50% of the protein from chromosome 21 that an unaffected individual produces from the same chromosome.
E)All of these statements about changes in chromosome number are correct.





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