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BS 161 EXAM 3 NEWEST EXAM COMPLETE 200 QUESTIONS AND CORRECT DETAILED ANSWERS
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BS 161 EXAM 3 NEWEST EXAM COMPLETE 200 QUESTIONS AND CORRECT DETAILED ANSWERS
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BS 161 EXAM 3 NEWEST EXAM COMPLETE 200QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) ALREADY GRADED A+.
Which major checkpoint delays the cell cycle when DNA
replication is incomplete?
1) G1 checkpoint
2) M checkpoint
3) G2 checkpoint G1, G2, and M checkpoints
4) G2 checkpoint - ANSWER >>>>G2 checkpoint
CDKs are important in the regulation of the cell cycle. They
carry out their function by:
1) degrading cyclin proteins
2) adding phosphate groups to proteins
3) preventing the progression of one stage of the cell cycle to
the next
4)removing phosphate - ANSWER >>>>Adding phosphate
groups to proteins
Which of the following is TRUE if a cell has a mutation in the
p53 gene such that the p53 protein is no longer able to be
phosphorylated?
1) The kinase activity in the nucleus would decrease
2) the cell would arrest
3) the cell would proceed through the cell cycle even in the
presence of DNA damage
4) the amount of cytoplasmic p53 would increase - ANSWER
>>>>The cell would proceed through the cell cycle even in the
presence of DNA damage
,Kinase - ANSWER >>>>an enzyme that catalyzes the
transfer of a phosphate group from ATP to a specified
molecule.
CDK - ANSWER >>>>cyclin dependent kinase
S phase - ANSWER >>>>The synthesis phase of the cell
cycle; the portion of interphase during which DNA is
replicated.
M phase checkpoint - ANSWER >>>>chromosomes have
attached to spindle apparatus, chromosomes have properly
segregated and MPF is absent
Cytokinesis - ANSWER >>>>division of the cytoplasm to form
two separate daughter cells
G2 checkpoint - ANSWER >>>>The cell checks to make sure
the DNA is copied correctly
G1 checkpoint - ANSWER >>>>checks for cell size, nutrients,
growth factors and DNA damage
cell cycle - ANSWER >>>>series of events that cells go
through as they grow and divide
G protein - ANSWER >>>>A GTP-binding protein that relays
signals from a plasma membrane signal receptor, known as a
G protein-coupled receptor, to other signal transduction
proteins inside the cell.
, Receptors - ANSWER >>>>Special structures that allow living
organisms to sense the conditions of their internal or external
environment.
How do new cyclin proteins appear in the cytoplasm? -
ANSWER >>>>They are made through protein synthesis.
Which of the following is capable of phosphorylating key
proteins involved in the regulation of the cell cycle?
1) CDK
2) p53 Protein
3) cyclin-CDK complex
4) cyclin
5) phosphatase - ANSWER >>>>Cyclin-CDK complex
Phosphatase - ANSWER >>>>removes a phosphate group
from a molecule
Cyclin-CDK complexes - ANSWER >>>>phosphorylate other
proteins to coordinate cell cycle progression; must be
activated and inactivated at appropriate times for cell cycle to
progress
Cyclin - ANSWER >>>>one of a family of closely related
proteins that regulate the cell cycle in eukaryotic cells
p53 protein - ANSWER >>>>initiates transcription
Cell division is regulated by?
1) growth factor signals
2) signals that indicate the DNA has been replicated
3) signals about the status of the cell
4) all of the above
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