BIOS 1700 EXAM 5 QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
The division of the cell's cytoplasm in a eukaryotic cell is known as: - ANS cytokinesis
Which statement represents a misconception about sister chromatids? - ANS Sister
chromatids are formed when the prokaryotic circular chromosome attaches at the plasma
membrane.
A zygote is: - ANS diploid.
Nondisjunction can occur in both mitosis and meiosis. - ANS true
An early observation in the study of the development of sea urchin embryos was that there
were several enzymes that became active and then inactive in synchrony with the pattern of
rapidly repeating cell divisions. These enzymes had a common characteristic in that they
phosphorylate (add phosphate groups to) other proteins. Furthermore, they are only active
when bound to another protein—ones that vary in abundance at specific times during the cell
cycle. These enzymes are: - ANS cyclin dependent kinases.
A proto-oncogene is a "normal" gene that, if mutated, can become an oncogene and lead to a
cell becoming cancerous. - ANS true
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, Reproduction by mitotic cell division: - ANS results in two daughter cells that are genetically
identical
What protein forms the contractile ring during cytokinesis in animal cells? - ANS actin
When do sister chromatids separate in meiosis? - ANS anaphase II
Trisomy 21 (Down syndrome) is one of only a few examples of an autosomal trisomy in which
the fetus develops to term and is born alive. - ANS true
An early observation in the study of the development of sea urchin embryos was that there
were several proteins that appeared and then disappeared in synchrony with the pattern of
rapidly repeating cell divisions. Because of this up-and-down pattern of abundance these
proteins became known as: - ANS cyclins.
Which of the answer choices could be a proto-oncogene? - ANS -a gene encoding a cell-
surface receptor
-a gene encoding a protein kinase
-a gene encoding a growth factor
-a gene encoding a G-protein
Suppose you are observing some cells with a microscope, and you see a cell that appears to be
dividing. You can see that as the cell starts to pinch in half, the DNA seems to be attached to the
plasma membrane via a membrane protein. On further analysis, you find that this organism's
DNA is circular - that is, it consists of a closed loop. What can you conclude about this organism
and its mode of cell division? - ANS It is a prokaryote that is dividing by binary fission.
What would happen if a pair of sister chromatids only connected to the mitotic spindle at one of
their kinetochores? - ANS -The sister chromatids would not separate.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS GRADED A+ 2025/2026
The division of the cell's cytoplasm in a eukaryotic cell is known as: - ANS cytokinesis
Which statement represents a misconception about sister chromatids? - ANS Sister
chromatids are formed when the prokaryotic circular chromosome attaches at the plasma
membrane.
A zygote is: - ANS diploid.
Nondisjunction can occur in both mitosis and meiosis. - ANS true
An early observation in the study of the development of sea urchin embryos was that there
were several enzymes that became active and then inactive in synchrony with the pattern of
rapidly repeating cell divisions. These enzymes had a common characteristic in that they
phosphorylate (add phosphate groups to) other proteins. Furthermore, they are only active
when bound to another protein—ones that vary in abundance at specific times during the cell
cycle. These enzymes are: - ANS cyclin dependent kinases.
A proto-oncogene is a "normal" gene that, if mutated, can become an oncogene and lead to a
cell becoming cancerous. - ANS true
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Reproduction by mitotic cell division: - ANS results in two daughter cells that are genetically
identical
What protein forms the contractile ring during cytokinesis in animal cells? - ANS actin
When do sister chromatids separate in meiosis? - ANS anaphase II
Trisomy 21 (Down syndrome) is one of only a few examples of an autosomal trisomy in which
the fetus develops to term and is born alive. - ANS true
An early observation in the study of the development of sea urchin embryos was that there
were several proteins that appeared and then disappeared in synchrony with the pattern of
rapidly repeating cell divisions. Because of this up-and-down pattern of abundance these
proteins became known as: - ANS cyclins.
Which of the answer choices could be a proto-oncogene? - ANS -a gene encoding a cell-
surface receptor
-a gene encoding a protein kinase
-a gene encoding a growth factor
-a gene encoding a G-protein
Suppose you are observing some cells with a microscope, and you see a cell that appears to be
dividing. You can see that as the cell starts to pinch in half, the DNA seems to be attached to the
plasma membrane via a membrane protein. On further analysis, you find that this organism's
DNA is circular - that is, it consists of a closed loop. What can you conclude about this organism
and its mode of cell division? - ANS It is a prokaryote that is dividing by binary fission.
What would happen if a pair of sister chromatids only connected to the mitotic spindle at one of
their kinetochores? - ANS -The sister chromatids would not separate.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
