BSC 2010 EXAM 4 QUESTIONS WITH
CORRECT ANSWERS
Eukaryotic chromosomes are composed of which of the following macromolecules? -
ANSWERSDNA and proteins
Starting with a fertilized egg (zygote), a series of six cell divisions would produce an
early embryo with how many cells? - ANSWERS64
In a diploid cell with 5 chromosome pairs (2n = 10), how many centromeres will be
found in a nucleus at G2 of the cell division cycle? - ANSWERS10
Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells
that have 1 1/2 times more DNA than G1 phase cells. What is the most likely part of the
cell cycle from which these cells were isolated? - ANSWERSin the S phase of the cell
cycle
G1 is associated with which of the following cellular events? - ANSWERSnormal growth
and cell function
What is the name of the microtubule-organizing center found in animal cells as an
identifiable structure present during all phases of the cell cycle? -
ANSWERScentrosome
In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit
which of the following events in the cell cycle? - ANSWERSattachment of microtubules
to kinetochores
The mitotic spindle plays a critical role in which of the following processes? -
ANSWERSseparation of sister chromatids
Metaphase is characterized by ________. - ANSWERSalignment of chromosomes on
the equator of the cell.
In what way do kinetochore microtubules facilitate the process of splitting the
centromeres? - ANSWERSThey create tension by pulling toward opposite poles.
A particular organism has 46 chromosomes in its karyotype. Which of the following
statements is correct regarding this organism? - ANSWERSIt produces gametes with 23
chromosomes.
A triploid cell contains three sets of homologous chromosomes. If a cell of a diploid
species that normally has 42 chromosomes per cell is triploid, this cell would be
, expected to have which of the following sets of chromosomes? - ANSWERS63
chromosomes in 21 sets of 3
Which of the following processes might produce a human zygote with 45
chromosomes? - ANSWERSan error in meiotic anaphase occurring in either an egg or
sperm
In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of
these pairs, such as pair 14, which of the following do the two chromosomes of the pair
have in common? - ANSWERSlength, centromere position, staining pattern, and traits
coded for by their genes
If a cell has completed meiosis I and the first cytokinesis, and is just beginning meiosis
II, which of the following is an appropriate description of its genetic contents? -
ANSWERSIt has half the amount of DNA as the cell that began meiosis.
Which of the following statements is correct regarding the human X chromosomes? -
ANSWERSIt carries genes that determine an individual's biological sex.
Which of the following statements correctly describes a karyotype? - ANSWERSIt is an
organized image of a cell's chromosomes.
The somatic cells of a privet shrub each contain a total of 46 chromosomes. How do the
chromosomes of this plant differ from the chromosomes of humans, who also have a
total of 46? - ANSWERSGenes of privet shrub chromosomes are significantly different
than those in humans.
Which of the following characteristics do homologous chromosomes exhibit? -
ANSWERSThey carry information for the same traits.
Many organisms spend most of their life cycle in the diploid state. If meiosis produces
haploid cells, how is the diploid number restored for these types of organisms? -
ANSWERSby fertilization
Which of the following statements is correct in describing the terms monohybrid cross
and dihybrid cross? - ANSWERSA dihybrid cross involves organisms that are
heterozygous for two characters that are being studied, and a monohybrid cross
involves organisms that are heterozygous for only one character being studied.
What was the most significant conclusion that Gregor Mendel drew from his
experiments with pea plants? - ANSWERSTraits are inherited in discrete units and are
not the result of "blending."
Using pea plants where the purple color flower is dominant and the white color flower is
recessive, a pea plant has 2 different alleles for flower color. This organism is said to be
_____ for the gene that controls flower color. - ANSWERSheterozygous.
CORRECT ANSWERS
Eukaryotic chromosomes are composed of which of the following macromolecules? -
ANSWERSDNA and proteins
Starting with a fertilized egg (zygote), a series of six cell divisions would produce an
early embryo with how many cells? - ANSWERS64
In a diploid cell with 5 chromosome pairs (2n = 10), how many centromeres will be
found in a nucleus at G2 of the cell division cycle? - ANSWERS10
Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells
that have 1 1/2 times more DNA than G1 phase cells. What is the most likely part of the
cell cycle from which these cells were isolated? - ANSWERSin the S phase of the cell
cycle
G1 is associated with which of the following cellular events? - ANSWERSnormal growth
and cell function
What is the name of the microtubule-organizing center found in animal cells as an
identifiable structure present during all phases of the cell cycle? -
ANSWERScentrosome
In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit
which of the following events in the cell cycle? - ANSWERSattachment of microtubules
to kinetochores
The mitotic spindle plays a critical role in which of the following processes? -
ANSWERSseparation of sister chromatids
Metaphase is characterized by ________. - ANSWERSalignment of chromosomes on
the equator of the cell.
In what way do kinetochore microtubules facilitate the process of splitting the
centromeres? - ANSWERSThey create tension by pulling toward opposite poles.
A particular organism has 46 chromosomes in its karyotype. Which of the following
statements is correct regarding this organism? - ANSWERSIt produces gametes with 23
chromosomes.
A triploid cell contains three sets of homologous chromosomes. If a cell of a diploid
species that normally has 42 chromosomes per cell is triploid, this cell would be
, expected to have which of the following sets of chromosomes? - ANSWERS63
chromosomes in 21 sets of 3
Which of the following processes might produce a human zygote with 45
chromosomes? - ANSWERSan error in meiotic anaphase occurring in either an egg or
sperm
In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of
these pairs, such as pair 14, which of the following do the two chromosomes of the pair
have in common? - ANSWERSlength, centromere position, staining pattern, and traits
coded for by their genes
If a cell has completed meiosis I and the first cytokinesis, and is just beginning meiosis
II, which of the following is an appropriate description of its genetic contents? -
ANSWERSIt has half the amount of DNA as the cell that began meiosis.
Which of the following statements is correct regarding the human X chromosomes? -
ANSWERSIt carries genes that determine an individual's biological sex.
Which of the following statements correctly describes a karyotype? - ANSWERSIt is an
organized image of a cell's chromosomes.
The somatic cells of a privet shrub each contain a total of 46 chromosomes. How do the
chromosomes of this plant differ from the chromosomes of humans, who also have a
total of 46? - ANSWERSGenes of privet shrub chromosomes are significantly different
than those in humans.
Which of the following characteristics do homologous chromosomes exhibit? -
ANSWERSThey carry information for the same traits.
Many organisms spend most of their life cycle in the diploid state. If meiosis produces
haploid cells, how is the diploid number restored for these types of organisms? -
ANSWERSby fertilization
Which of the following statements is correct in describing the terms monohybrid cross
and dihybrid cross? - ANSWERSA dihybrid cross involves organisms that are
heterozygous for two characters that are being studied, and a monohybrid cross
involves organisms that are heterozygous for only one character being studied.
What was the most significant conclusion that Gregor Mendel drew from his
experiments with pea plants? - ANSWERSTraits are inherited in discrete units and are
not the result of "blending."
Using pea plants where the purple color flower is dominant and the white color flower is
recessive, a pea plant has 2 different alleles for flower color. This organism is said to be
_____ for the gene that controls flower color. - ANSWERSheterozygous.
