Homework Answers
- the extracellular survival factors that inhibit apoptosis: stimulates bad phosphorylation.
One way that extracellular survival factors can suppress apoptosis.The survival factor binds to a cell-surface receptor protein, thereby activating various intracellular signalling pathways. Some of these pathways lead to the activation of protein kinases that phosphorylate the Bad protein. Bad promotes apoptosis by binding to and inactivating apoptosis-inhibitor proteins such as Bcl-2. Once phosphorylated, Bad releases its bound Bcl-2 protein, which can now act to inhibit apoptosis. Thus, the survival factor suppresses apoptosis by keeping Bad phosphorylated and out of action.
Q.3. Proto oncogen
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Which of the following are ways that extracellular survival factors apoptosis? Stimulate Bad phosphorylation Stimulate activation...
For the following, choose which one of the following statements is FALSE: The Bcl2 family of...
For the following, choose which one of the following statements is FALSE: The Bcl2 family of proteins… (a) can stimulate apoptosis. (b) can inhibit apoptosis. (c) are extracellular signaling proteins. (d) are intracellular proteins in a pathway.
Which of the following statements about eukaryotic activator proteins is false? Choose one: A. They stimulate...
Which of the following statements about eukaryotic activator proteins is false? Choose one: A. They stimulate transcriptional initiation by opening up the double helix. * B. They stimulate transcription initiation by recruiting proteins that modify chromatin structure. C. They stimulate transcription initiation by aiding in the assembly of general transcription factors and RNA polymerase at the promoter. D. They stimulate transcription initiation by promoting the assembly of a transcription initiation complex at the promoter.
QUESTION 4 Which of the following is NOT a mechanisms of protein expression? Specific transcription factors...
QUESTION 4 Which of the following is NOT a mechanisms of protein expression? Specific transcription factors binding to enhancers Export of mRNA into the cytoplasm DNA polymerase phosphorylation 5'UTR secondary structure blocking AUG QUESTION 5 Suppose you have all the necessary proteins for transcription of a gene present AND active/turned on AND in the right location within the cell. Under what conditions would you NOT see transcription of that gene? UmRNA has already been transcribed from that gene but has...
QUESTION 18 Following activation of a mitogenic signaling pathway, which of these events occur to promote...
QUESTION 18 Following activation of a mitogenic signaling pathway, which of these events occur to promote cell division? a. Dephosphorylation of Retinoblastoma protein. b. Increased expression of p21. c. Phosphorylation of Myc. d. Inhibition of new protein synthesis. 1 points QUESTION 19 The slow rise of S cyclin levels throughout G1 phase is due to ___________, and the abrupt decrease is caused by ___________. a. import; export b. synthesis; mitosis c. transcription; proteolysis d. phosphorylation; translation
Which of the following is true about transcription factors? They regulate the synthesis of DNA in...
Which of the following is true about transcription factors? They regulate the synthesis of DNA in response to a signal. o They are needed to regulate the synthesis of a protein in the cytoplasm. They control which genes are turned on to form mRNA. O They block the mRNA from being translated. Kinases along the signal transduction pathway are often activated via o phosphorylation by ATP O dephosphorylation by ADP
Which of the following are factors that go into determining the proteome of a somatic cell...
Which of the following are factors that go into determining the proteome of a somatic cell within a particular human? (Select all that apply) T A. The rate of protein degradation B. The activation rate of zymogens C.The number of transcripts translated D. The secretion of proteins from a cell
1a. Which of the following would tend to stimulate metastasis? Select all that apply. production of...
1a. Which of the following would tend to stimulate metastasis? Select all that apply. production of proteases that degrade structural proteins activation of rho-GTPases production of E-cadherin reduced DNA polymerase activity 1b. You observe a tumor that is producing VEGF and FGF but not displaying angiogenesis. Which of the following could explain this observation? Select all that apply. Angiostatin is present in high concentrations There are no blood vessels nearby enough The cancer is metastatic Angiogenesis inhibitors are present in...
Histone acetylases (HATS) promote gene expression in which of the following ways? They promote the binding...
Histone acetylases (HATS) promote gene expression in which of the following ways? They promote the binding of transcription factors to the DNA They remove a chemical tag from DNA that allows expression to occur They provide a signal for recognition of the start site of the gene They lessen the charge attraction between histones and DNA
6.) Mitogens are (b) transcription factors important for cyclin production (c) kinases that cause cells to...
6.) Mitogens are (b) transcription factors important for cyclin production (c) kinases that cause cells to grow in size (a) extracellular signals that stimulate cell division. d) produced by mitotic cells to keep nearby neighboring cells from dividing 7.) Which of the following cyclins is most active during mitosis? (a) cyclin A (b) cyclin B (c) cyclin C (d) cyclin D 8) Which molecule inactivate itotic cyclin-CDK complexes using phosphorylation? (a) Cdc25 (b) Cdc6 (c) Weel (d) Helicase 9.) What...
need 35-41 asap!! 35. Which of the following is true about complement? a. The activation of...
need 35-41 asap!!
35. Which of the following is true about complement? a. The activation of complement ends in the lysis of bacterial cells. b. They are a set of proteins in blood, lymph and extracellular fluid c. They attack the membrane of bacterial cells. d. all of the above 36. Which of the following produces antibodies? a. memory cells c. liver cells b. T cells d. plasma cells 37. Most of the available antimicrobial agents are effective against a....
Which of the following statements about eukaryotic activator proteins is false? Choose one: A. They stimulate transcriptional initiation by opening up the double helix. * B. They stimulate transcription initiation by recruiting proteins that modify chromatin structure. C. They stimulate transcription initiation by aiding in the assembly of general transcription factors and RNA polymerase at the promoter. D. They stimulate transcription initiation by promoting the assembly of a transcription initiation complex at the promoter.
QUESTION 4 Which of the following is NOT a mechanisms of protein expression? Specific transcription factors binding to enhancers Export of mRNA into the cytoplasm DNA polymerase phosphorylation 5'UTR secondary structure blocking AUG QUESTION 5 Suppose you have all the necessary proteins for transcription of a gene present AND active/turned on AND in the right location within the cell. Under what conditions would you NOT see transcription of that gene? UmRNA has already been transcribed from that gene but has...
Which of the following is true about transcription factors? They regulate the synthesis of DNA in response to a signal. o They are needed to regulate the synthesis of a protein in the cytoplasm. They control which genes are turned on to form mRNA. O They block the mRNA from being translated. Kinases along the signal transduction pathway are often activated via o phosphorylation by ATP O dephosphorylation by ADP
Histone acetylases (HATS) promote gene expression in which of the following ways? They promote the binding of transcription factors to the DNA They remove a chemical tag from DNA that allows expression to occur They provide a signal for recognition of the start site of the gene They lessen the charge attraction between histones and DNA
6.) Mitogens are (b) transcription factors important for cyclin production (c) kinases that cause cells to grow in size (a) extracellular signals that stimulate cell division. d) produced by mitotic cells to keep nearby neighboring cells from dividing 7.) Which of the following cyclins is most active during mitosis? (a) cyclin A (b) cyclin B (c) cyclin C (d) cyclin D 8) Which molecule inactivate itotic cyclin-CDK complexes using phosphorylation? (a) Cdc25 (b) Cdc6 (c) Weel (d) Helicase 9.) What...
need 35-41 asap!!
35. Which of the following is true about complement? a. The activation of complement ends in the lysis of bacterial cells. b. They are a set of proteins in blood, lymph and extracellular fluid c. They attack the membrane of bacterial cells. d. all of the above 36. Which of the following produces antibodies? a. memory cells c. liver cells b. T cells d. plasma cells 37. Most of the available antimicrobial agents are effective against a....
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