Molecular Biology Exam questions
and answers graded A+
The number of cells in the different phases of a population can be determined most easily by using a
____ to measure the amount of dna per cell in a large sample of cells. - ANS✅✅Flow cytometer
The phase of the cell cycle that corresponds to the interval between mitosis and initiation of dna
replication is referred to as the - ANS✅✅g1 phase
Progression through the cell cycle in the yeast saccharomyces cerevisiae is regulated by -
ANS✅✅external signals such as availability of nutrients and mating factors
The g1 checkpoint in animal cells is called - ANS✅✅the restriction point
The g2 cell cycle checkpoint detects - ANS✅✅unreplicated or damaged dna
Which of the following represents the amount of dna in a typical g2 cell? - ANS✅✅2n
The g2 checkpoint prevents entry into ____ if dna synthesis is incomplete and/or the dna is
damaged. - ANS✅✅M
Dna content can be found using a method of flow cytometry that can determine 2n or 4n states of
cells based on cell counting and fluorescent labeling of dna . which of the following phases would be
identified through flow cytometry as 2n? - ANS✅✅Phase only
In which of the following cell types do g1 and g2 not take place? - ANS✅✅Early embryonic cells
The g1 checkpoint in budding yeast cells is called - ANS✅✅start
Cell cycles of early embryonic animal cells are unusual because they have - ANS✅✅no g1 or g2
Cell cycle checkpoints ensure that complete genomes are transmitted to daughter cells. Dna damage
checkpoints are found in all of the following phases except - ANS✅✅m phase
, Cells in the quiescent phase of the cell cycle are said to be in the ___ phase - ANS✅✅g0
You perform an experiment by incubating a radiolabeled nucleotide into the medium of a culture of
cells. The cells that take up the radiolabel would be expected to be in what phase of the cell cycle? -
ANS✅✅S phase
After development, liver cells stop cycling and stay in g1. - ANS✅✅False
The eukaryotic cell cycle is composed of four phases in the following order: - ANS✅✅G1
S - ANS✅✅
G2 - ANS✅✅
M. - ANS✅✅
In yeast, START triggers the progression from G1 to S. Which of the following are involved in
regulating START? - ANS✅✅All of the above
The oocytes in a normal 7-year-old female (prepubertal) would be expected to be arrested in which
stage of the cell cycle, until they are hormonally stimulated? - ANS✅✅G2
The length of time it takes for the cells labeled during DNA synthesis to begin to enter mitosis is a
good estimate of the length of the _______ phase(s). - ANS✅✅G2
Skin fibroblasts near a wound, arrested in G0, are stimulated to enter G1 by ___ growth factor. -
ANS✅✅Platelet-derived
Interphase usually consists of G1, S, and G2, but in some cells it consists only of S - ANS✅✅True
Which of the following is not a mechanism for regulation of the cell cycle? - ANS✅✅Proteolysis of
cdk/cdc protein kinases
and answers graded A+
The number of cells in the different phases of a population can be determined most easily by using a
____ to measure the amount of dna per cell in a large sample of cells. - ANS✅✅Flow cytometer
The phase of the cell cycle that corresponds to the interval between mitosis and initiation of dna
replication is referred to as the - ANS✅✅g1 phase
Progression through the cell cycle in the yeast saccharomyces cerevisiae is regulated by -
ANS✅✅external signals such as availability of nutrients and mating factors
The g1 checkpoint in animal cells is called - ANS✅✅the restriction point
The g2 cell cycle checkpoint detects - ANS✅✅unreplicated or damaged dna
Which of the following represents the amount of dna in a typical g2 cell? - ANS✅✅2n
The g2 checkpoint prevents entry into ____ if dna synthesis is incomplete and/or the dna is
damaged. - ANS✅✅M
Dna content can be found using a method of flow cytometry that can determine 2n or 4n states of
cells based on cell counting and fluorescent labeling of dna . which of the following phases would be
identified through flow cytometry as 2n? - ANS✅✅Phase only
In which of the following cell types do g1 and g2 not take place? - ANS✅✅Early embryonic cells
The g1 checkpoint in budding yeast cells is called - ANS✅✅start
Cell cycles of early embryonic animal cells are unusual because they have - ANS✅✅no g1 or g2
Cell cycle checkpoints ensure that complete genomes are transmitted to daughter cells. Dna damage
checkpoints are found in all of the following phases except - ANS✅✅m phase
, Cells in the quiescent phase of the cell cycle are said to be in the ___ phase - ANS✅✅g0
You perform an experiment by incubating a radiolabeled nucleotide into the medium of a culture of
cells. The cells that take up the radiolabel would be expected to be in what phase of the cell cycle? -
ANS✅✅S phase
After development, liver cells stop cycling and stay in g1. - ANS✅✅False
The eukaryotic cell cycle is composed of four phases in the following order: - ANS✅✅G1
S - ANS✅✅
G2 - ANS✅✅
M. - ANS✅✅
In yeast, START triggers the progression from G1 to S. Which of the following are involved in
regulating START? - ANS✅✅All of the above
The oocytes in a normal 7-year-old female (prepubertal) would be expected to be arrested in which
stage of the cell cycle, until they are hormonally stimulated? - ANS✅✅G2
The length of time it takes for the cells labeled during DNA synthesis to begin to enter mitosis is a
good estimate of the length of the _______ phase(s). - ANS✅✅G2
Skin fibroblasts near a wound, arrested in G0, are stimulated to enter G1 by ___ growth factor. -
ANS✅✅Platelet-derived
Interphase usually consists of G1, S, and G2, but in some cells it consists only of S - ANS✅✅True
Which of the following is not a mechanism for regulation of the cell cycle? - ANS✅✅Proteolysis of
cdk/cdc protein kinases
