bio 148 exam 1 questions with correct
answers
Which of the following represents the correct order of the phases of the cell
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cycle? - CORRECT ANSWER✔✔-G1 -> S -> G2 -> M
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The division of the cytoplasm is called - CORRECT ANSWER✔✔-cytokinesis
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True or False--DNA replication occurs in mitosis - CORRECT ANSWER✔✔-false
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True or False--Mitosis and cytoplasmic division result in the formation of two
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genetically identical cells. - CORRECT ANSWER✔✔-true| | | | |
A cell has 6 chromosomes in G1 phase. How many DNA molecules are in the cell
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during G1 phase? - CORRECT ANSWER✔✔-6. During G1 phase, the cellular
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contents duplicate, but the DNA does not. Each cell therefore has 6 chromosomes
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in the form of 6 single chromatids, and each chromatid is one molecule of DNA.
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Scientists isolate cells from an individual in various phases of the cell cycle. They
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find a group of cells that have 1½ times more DNA than do G1 phase cells. The
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cells of this group are _____. - CORRECT ANSWER✔✔-in the S phase of the cell
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cycle. in the S phase of the cell cycle
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,Humans have 46 chromosomes in each of their cells in G1 phase. How many
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chromosomes do we have in each of our cells during G2 phase? - CORRECT | | | | | | | | | | | | | |
ANSWER✔✔-46. The number of chromosomes does not change between G1 and | | | | | | | | | | |
G2 phases. The number of chromatids (DNA molecules) doubles, but the number
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of chromosomes does not.
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S phase of the cell cycle corresponds to _____ - CORRECT ANSWER✔✔-the phase
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in which DNA is being replicated
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Which of the following statements about sister chromatids is TRUE? - CORRECT
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ANSWER✔✔-They are formed as the result of semiconservative DNA replication | | | | | | | | |
Cell A has 5 picograms of DNA. Cell B has 10 picograms of DNA. Both cells are
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from the same organism. Which of the following is the best description of the cell
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|cycle stage of each cell? - CORRECT ANSWER✔✔-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
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|twice as much DNA as a cell in G1 phase.
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How does the structure of DNA hold the information needed to code for the
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many features of multicellular organisms? - CORRECT ANSWER✔✔-The base
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sequence of DNA carries all the information needed to code for proteins
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When nucleotides polymerize to form a nucleic acid, _____. - CORRECT
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ANSWER✔✔-a covalent bond forms between the sugar of one nucleotide and the | | | | | | | | | | |
phosphate of a second
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X-rays can break the sugar-phosphate backbone of DNA. What type of bond
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breaks when this occurs - CORRECT ANSWER✔✔-Phosphodiester Bond
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, Nucleic acids have a definite polarity, or directionality. Stated another way, one
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end of the molecule is different from the other end. How are these ends
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described? - CORRECT ANSWER✔✔-One end has an unlinked -OH group on the 3'
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carbon; the other end has an unlinked 5' phosphate group
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An organism belonging to the Domain Eukarya.... - CORRECT ANSWER✔✔-
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possess membrane bound organelles AND uses the same type of genetic material
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as a member of the Domain Archaea
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Which of the following is TRUE about the tree of life? - CORRECT ANSWER✔✔-
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Two of the three domains of life consist of prokaryotic organisms
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Which of the following is FALSE regarding hypotheses? - CORRECT ANSWER✔✔-
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They can only be tested with laboratory experiments
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Which of the following, if true, would argue against long necks being an
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adaptation in giraffes? - CORRECT ANSWER✔✔-Shorter-necked giraffes have
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more sturdy necks and are more likely to win head-striking contests, winning the
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opportunity to mate with females. | | | |
In order for evolution by natural selection to be responsible for long giraffe necks,
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|which of the following must be true? - CORRECT ANSWER✔✔-There must have
| | | | | | | | | | | |
been variation in neck length in previous populations and neck length must be
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heritable
answers
Which of the following represents the correct order of the phases of the cell
| | | | | | | | | | | | | |
cycle? - CORRECT ANSWER✔✔-G1 -> S -> G2 -> M
| | | | | | | | |
The division of the cytoplasm is called - CORRECT ANSWER✔✔-cytokinesis
| | | | | | | | |
True or False--DNA replication occurs in mitosis - CORRECT ANSWER✔✔-false
| | | | | | | | |
True or False--Mitosis and cytoplasmic division result in the formation of two
| | | | | | | | | | | |
genetically identical cells. - CORRECT ANSWER✔✔-true| | | | |
A cell has 6 chromosomes in G1 phase. How many DNA molecules are in the cell
| | | | | | | | | | | | | | | |
during G1 phase? - CORRECT ANSWER✔✔-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.
| | | | | | | | | | | | | | |
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 _____. - CORRECT ANSWER✔✔-in the S phase of the cell
| | | | | | | | | | | | | | |
cycle. in the S phase of the cell cycle
| | | | | | | |
,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? - CORRECT | | | | | | | | | | | | | |
ANSWER✔✔-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.
| | |
S phase of the cell cycle corresponds to _____ - CORRECT ANSWER✔✔-the phase
| | | | | | | | | | | |
in which DNA is being replicated
| | | | | |
Which of the following statements about sister chromatids is TRUE? - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-They are formed as the result of semiconservative DNA replication | | | | | | | | |
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? - CORRECT ANSWER✔✔-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.
| | | | | | | | |
How does the structure of DNA hold the information needed to code for the
| | | | | | | | | | | | | |
many features of multicellular organisms? - CORRECT ANSWER✔✔-The base
| | | | | | | | |
sequence of DNA carries all the information needed to code for proteins
| | | | | | | | | | |
When nucleotides polymerize to form a nucleic acid, _____. - CORRECT
| | | | | | | | | | |
ANSWER✔✔-a covalent bond forms between the sugar of one nucleotide and the | | | | | | | | | | |
phosphate of a second
| | | |
X-rays can break the sugar-phosphate backbone of DNA. What type of bond
| | | | | | | | | | | |
breaks when this occurs - CORRECT ANSWER✔✔-Phosphodiester Bond
| | | | | | |
, 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? - CORRECT ANSWER✔✔-One end has an unlinked -OH group on the 3'
| | | | | | | | | | | |
carbon; the other end has an unlinked 5' phosphate group
| | | | | | | | | |
An organism belonging to the Domain Eukarya.... - CORRECT ANSWER✔✔-
| | | | | | | | |
possess membrane bound organelles AND uses the same type of genetic material
| | | | | | | | | | |
as a member of the Domain Archaea
| | | | | | |
Which of the following is TRUE about the tree of life? - CORRECT ANSWER✔✔-
| | | | | | | | | | | | |
Two of the three domains of life consist of prokaryotic organisms
| | | | | | | | | |
Which of the following is FALSE regarding hypotheses? - CORRECT ANSWER✔✔-
| | | | | | | | | |
They can only be tested with laboratory experiments
| | | | | | |
Which of the following, if true, would argue against long necks being an
| | | | | | | | | | | | |
adaptation in giraffes? - CORRECT ANSWER✔✔-Shorter-necked giraffes have
| | | | | | | |
more sturdy necks and are more likely to win head-striking contests, winning the
| | | | | | | | | | | | |
opportunity to mate with females. | | | |
In order for evolution by natural selection to be responsible for long giraffe necks,
| | | | | | | | | | | | |
|which of the following must be true? - CORRECT ANSWER✔✔-There must have
| | | | | | | | | | | |
been variation in neck length in previous populations and neck length must be
| | | | | | | | | | | | |
heritable
