BIO 148 EXAM 1 RETAKE QUESTIONS
& ANSWERS
G1 -> S -> G2 -> M - Correct Answers -Which of the following represents the correct
order of the phases of the cell cycle?
cytokinesis - Correct Answers -The division of the cytoplasm is called
false - Correct Answers -True or False--DNA replication occurs in mitosis
true - Correct Answers -True or False--Mitosis and cytoplasmic division result in the
formation of two genetically identical cells.
6. During G1 phase, the cellular contents duplicate, but the DNA does not. Each cell
therefore has 6 chromosomes in the form of 6 single chromatids, and each chromatid is
one molecule of DNA. - Correct Answers -A cell has 6 chromosomes in G1 phase. How
many DNA molecules are in the cell during G1 phase?
in the S phase of the cell cycle. in the S phase of the cell cycle - Correct Answers -
Scientists isolate cells from an individual in various phases of the cell cycle. They find a
group of cells that have 1½ times more DNA than do G1 phase cells. The cells of this
group are _____.
46. The number of chromosomes does not change between G1 and G2 phases. The
number of chromatids (DNA molecules) doubles, but the number of chromosomes does
not. - Correct Answers -Humans have 46 chromosomes in each of their cells in G1
phase. How many chromosomes do we have in each of our cells during G2 phase?
the phase in which DNA is being replicated - Correct Answers -S phase of the cell cycle
corresponds to _____
They are formed as the result of semiconservative DNA replication - Correct Answers -
Which of the following statements about sister chromatids is TRUE?
Cell A is in G1 phase; Cell B is in G2 phase. Since the DNA replicates during S phase,
a cell in G2 phase would have twice as much DNA as a cell in G1 phase. - Correct
Answers -Cell A has 5 picograms of DNA. Cell B has 10 picograms of DNA. Both cells
are from the same organism. Which of the following is the best description of the cell
cycle stage of each cell?
,The base sequence of DNA carries all the information needed to code for proteins -
Correct Answers -How does the structure of DNA hold the information needed to code
for the many features of multicellular organisms?
a covalent bond forms between the sugar of one nucleotide and the phosphate of a
second - Correct Answers -When nucleotides polymerize to form a nucleic acid, _____.
Phosphodiester Bond - Correct Answers -X-rays can break the sugar-phosphate
backbone of DNA. What type of bond breaks when this occurs
One end has an unlinked -OH group on the 3' carbon; the other end has an unlinked 5'
phosphate group - Correct Answers -Nucleic acids have a definite polarity, or
directionality. Stated another way, one end of the molecule is different from the other
end. How are these ends described?
possess membrane bound organelles AND uses the same type of genetic material as a
member of the Domain Archaea - Correct Answers -An organism belonging to the
Domain Eukarya....
Two of the three domains of life consist of prokaryotic organisms - Correct Answers -
Which of the following is TRUE about the tree of life?
They can only be tested with laboratory experiments - Correct Answers -Which of the
following is FALSE regarding hypotheses?
Shorter-necked giraffes have more sturdy necks and are more likely to win head-striking
contests, winning the opportunity to mate with females. - Correct Answers -Which of the
following, if true, would argue against long necks being an adaptation in giraffes?
There must have been variation in neck length in previous populations and neck length
must be heritable - Correct Answers -In order for evolution by natural selection to be
responsible for long giraffe necks, which of the following must be true?
an adaptation; reproduce more - Correct Answers -If natural selection favored long
necks, then long necks would be called ____ and giraffes with long necks would ______
than shorter-necked giraffes?
Cells should be able to accumulate in it if the broth used can support the growth of cells.
A control tries to produce the same conditions as the experiment with one change. The
open neck would allow air and microorganisms to enter the flask, while the swan neck
would prevent microorganisms from getting in. - Correct Answers -In what way could the
open necked flask in Pasteur's experiment testing the theory of spontaneous generation
be considered a control?
, The control group shouldn't be exposed to music, but otherwise treated the same as the
experimental groups - Correct Answers -You are conducting an experiment to test the
hypothesis that apple trees will produce larger fruit when exposed to music. You have
10 experimental trees that are exposed to different amounts of music. Which of the
following is accurate about your control group?
All cells divided by mitosis - Correct Answers -Which of the following is not part of Cell
Theory
Microscope - Correct Answers -What instrument allowed scientists to observe cells?
Leeuwenhoek - Correct Answers -Who discovered bacteria from tooth scrapings?
All cells come from pre-existing cells. - Correct Answers -What part of cell theory did
Schleiden and Schwann disagree about?
They are composed of one or more cells AND they contain ribosomes - Correct
Answers -Which of the following is a characteristic shared by all living things?
The individuals that have traits better suited to the changed environment would be more
likely to survive and reproduce than those with less suitable traits. Natural selection
would act to increase survival and reproduction in individuals who have traits that are
better adapted to their environment - Correct Answers -A population is a group of
individuals of the same species. According to the theory of natural selection, what is
likely to happen to a population when a change occurs in its environment (for example,
the amount of rainfall decreases or the temperature increases)?
The characteristic can be passed on to offspring - Correct Answers -What does it mean
to say that a characteristic of an individual organism is heritable?
This moth has high fitness. The moth is adapted to her environment, which increases
her fitness (i.e the number of surviving offspring she produces). - Correct Answers -A
moth learns to visit nectar-filled white flowers, and the good food source allows it to lay
more eggs and have more surviving offspring than other moths in the area. Which of the
following can you conclude?
Natural selection is a directed (non-random) process—the likelihood one variant will be
favored in a given environment over another is predictable, even if the origin of the
variation is not. Mutations are random, but natural selection pushes evolution in a
certain direction - Correct Answers -The variation natural selection operates on is due to
random mutations. What does this imply about natural selection?
That male has a greater fitness than the other males. Producing the most surviving
offspring is the definition of greater fitness. - Correct Answers -One individual in a
population fathers more offspring than all the other males in that population. Which
statement best describes this situation?
& ANSWERS
G1 -> S -> G2 -> M - Correct Answers -Which of the following represents the correct
order of the phases of the cell cycle?
cytokinesis - Correct Answers -The division of the cytoplasm is called
false - Correct Answers -True or False--DNA replication occurs in mitosis
true - Correct Answers -True or False--Mitosis and cytoplasmic division result in the
formation of two genetically identical cells.
6. During G1 phase, the cellular contents duplicate, but the DNA does not. Each cell
therefore has 6 chromosomes in the form of 6 single chromatids, and each chromatid is
one molecule of DNA. - Correct Answers -A cell has 6 chromosomes in G1 phase. How
many DNA molecules are in the cell during G1 phase?
in the S phase of the cell cycle. in the S phase of the cell cycle - Correct Answers -
Scientists isolate cells from an individual in various phases of the cell cycle. They find a
group of cells that have 1½ times more DNA than do G1 phase cells. The cells of this
group are _____.
46. The number of chromosomes does not change between G1 and G2 phases. The
number of chromatids (DNA molecules) doubles, but the number of chromosomes does
not. - Correct Answers -Humans have 46 chromosomes in each of their cells in G1
phase. How many chromosomes do we have in each of our cells during G2 phase?
the phase in which DNA is being replicated - Correct Answers -S phase of the cell cycle
corresponds to _____
They are formed as the result of semiconservative DNA replication - Correct Answers -
Which of the following statements about sister chromatids is TRUE?
Cell A is in G1 phase; Cell B is in G2 phase. Since the DNA replicates during S phase,
a cell in G2 phase would have twice as much DNA as a cell in G1 phase. - Correct
Answers -Cell A has 5 picograms of DNA. Cell B has 10 picograms of DNA. Both cells
are from the same organism. Which of the following is the best description of the cell
cycle stage of each cell?
,The base sequence of DNA carries all the information needed to code for proteins -
Correct Answers -How does the structure of DNA hold the information needed to code
for the many features of multicellular organisms?
a covalent bond forms between the sugar of one nucleotide and the phosphate of a
second - Correct Answers -When nucleotides polymerize to form a nucleic acid, _____.
Phosphodiester Bond - Correct Answers -X-rays can break the sugar-phosphate
backbone of DNA. What type of bond breaks when this occurs
One end has an unlinked -OH group on the 3' carbon; the other end has an unlinked 5'
phosphate group - Correct Answers -Nucleic acids have a definite polarity, or
directionality. Stated another way, one end of the molecule is different from the other
end. How are these ends described?
possess membrane bound organelles AND uses the same type of genetic material as a
member of the Domain Archaea - Correct Answers -An organism belonging to the
Domain Eukarya....
Two of the three domains of life consist of prokaryotic organisms - Correct Answers -
Which of the following is TRUE about the tree of life?
They can only be tested with laboratory experiments - Correct Answers -Which of the
following is FALSE regarding hypotheses?
Shorter-necked giraffes have more sturdy necks and are more likely to win head-striking
contests, winning the opportunity to mate with females. - Correct Answers -Which of the
following, if true, would argue against long necks being an adaptation in giraffes?
There must have been variation in neck length in previous populations and neck length
must be heritable - Correct Answers -In order for evolution by natural selection to be
responsible for long giraffe necks, which of the following must be true?
an adaptation; reproduce more - Correct Answers -If natural selection favored long
necks, then long necks would be called ____ and giraffes with long necks would ______
than shorter-necked giraffes?
Cells should be able to accumulate in it if the broth used can support the growth of cells.
A control tries to produce the same conditions as the experiment with one change. The
open neck would allow air and microorganisms to enter the flask, while the swan neck
would prevent microorganisms from getting in. - Correct Answers -In what way could the
open necked flask in Pasteur's experiment testing the theory of spontaneous generation
be considered a control?
, The control group shouldn't be exposed to music, but otherwise treated the same as the
experimental groups - Correct Answers -You are conducting an experiment to test the
hypothesis that apple trees will produce larger fruit when exposed to music. You have
10 experimental trees that are exposed to different amounts of music. Which of the
following is accurate about your control group?
All cells divided by mitosis - Correct Answers -Which of the following is not part of Cell
Theory
Microscope - Correct Answers -What instrument allowed scientists to observe cells?
Leeuwenhoek - Correct Answers -Who discovered bacteria from tooth scrapings?
All cells come from pre-existing cells. - Correct Answers -What part of cell theory did
Schleiden and Schwann disagree about?
They are composed of one or more cells AND they contain ribosomes - Correct
Answers -Which of the following is a characteristic shared by all living things?
The individuals that have traits better suited to the changed environment would be more
likely to survive and reproduce than those with less suitable traits. Natural selection
would act to increase survival and reproduction in individuals who have traits that are
better adapted to their environment - Correct Answers -A population is a group of
individuals of the same species. According to the theory of natural selection, what is
likely to happen to a population when a change occurs in its environment (for example,
the amount of rainfall decreases or the temperature increases)?
The characteristic can be passed on to offspring - Correct Answers -What does it mean
to say that a characteristic of an individual organism is heritable?
This moth has high fitness. The moth is adapted to her environment, which increases
her fitness (i.e the number of surviving offspring she produces). - Correct Answers -A
moth learns to visit nectar-filled white flowers, and the good food source allows it to lay
more eggs and have more surviving offspring than other moths in the area. Which of the
following can you conclude?
Natural selection is a directed (non-random) process—the likelihood one variant will be
favored in a given environment over another is predictable, even if the origin of the
variation is not. Mutations are random, but natural selection pushes evolution in a
certain direction - Correct Answers -The variation natural selection operates on is due to
random mutations. What does this imply about natural selection?
That male has a greater fitness than the other males. Producing the most surviving
offspring is the definition of greater fitness. - Correct Answers -One individual in a
population fathers more offspring than all the other males in that population. Which
statement best describes this situation?
