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- Q. Cro protein expression and activity may be activated in a prophage by a)lysogenic dominance b)rapid growth of a healthy cell c)repair of damaged cellular DNA d)presence of glucose in the environment alternate exon splicing of mRNAno need to explain, pls help 1) Actively dividing cells do not require which of the following complexes? a) Cdk1/cyclin A b) Cdk2/cyclin B c) Cdk3/cyclin C d) Cdk4/cyclin D 2) Which of the following complexes contributes to the transcription of cyclin E? a) Cdk1/cyclin A b) Cdk2/cyclin B c) Cdk3/cyclin C d) Cdk4/cyclin D 3. DNA Polymerase δ (delta) has the following functions EXCEPT a) proof-read the new DNA strand. b) detach the dangling RNA primer. c) nip the RNA primer during termination. d) add DNA nucleotides to the lagging strand.Cytokinesis in plant cells is different than cytokinesis in animal cells. a) Explain why it has to be different, andb) briefly describe the processes in the two different cell types.
- Gleevec inhibits an enzyme needed in cancer cell proliferation. It acts by increasing the enzyme's KM value without affecting kat. The solid line in the graph shows vo versus [S] without Gleevec. Which of the dashed lines shows the rate for the enzyme in the presence of Gleevec? A) IV B) V C) II D) I E) III vo (μM/s) 12 10 8 4 2 0 0 10 IV 20 [S] (μM) 250 500What statement about Cdks/Cyclins below is false? A) Cyclins phosphorylate Cdks B) Cdks are kinases C) Cdk expression is constant during the cell cycle D) Cyclin expression fluctuates during the cell cycle E) Cdk activity fluctuates during the cell cycleBased on studies, synaptotagmin is a crucial protein anchored to the vesicle and it is activated by binding to a) A RIM-BP protein anchore b) phosphorylation c) A SNAP-25 complex d) five Ca2+ via its C2A and C2B domains
- DNA is degraded by DNase. Select the organism that would have the greatest number of organelles affected. O A) Arabidopsis thaliana B) Saccharomyces cerevisiae C) Escherichia coli K-12 D) Mus musculus E) Passer domesticusThe monod model relates bacterial growth to substrate utilization. (i) The relationship of growth-limiting substrate utilization to bacterial growth is what is at the heart of the model. (ii) The mathematical equations of the model can vary in complexity depending on the given conditions (iii) Endogenous decay is the only mechanisms of cell death that is important enough to warrant representation in the monod model. Group of answer choices 1.Only (i) and (ii) 2.Only (i) and (iii) are correct 3.(i), (ii) and (iii) are all correctExplain why bacterial chemotaxis is referred to as a “biased random walk”
- forskolin is a drug used by scientists to render adenylyl cyclase (AC) constitutively (always) active. What will this do to: a) PKA levels? b) IP3 levels? O a) increase PKA b) no effect on IP3 O a) no effect on PKA b) increase IP3 O a) no effect on PKA b) no effect on IP3 O a) increase PKA b) increase IP3In the experiment performed by Messelson and Stahl, bacterial cells grown in 15N-containing growth medium for many generations were then allowed to grow in 14N-containing medium. Suppose they would have conducted the experiment the other way around: that is, to first grow bacterial cells in 14N-containing medium for many generations and then switching them to a 15N-containing growth medium. After two generations of growth in 15N media the results of a CsCl density gradient centrifugation of the DNA would be expected to show O one band of intermediate density and one band of high-density (i.e. heavy band) one band on intermediate density O one band of intermediate-density and one band of low-density (i.e. light band) one band of low density (L.e. light band) and one band of high density (1.e. heavy band). one band of low density (I.e. light band), one band of intermediate density, and one band of high density (i.e. heavy band).In the experiment performed by Messelson and Stahl, bacterial cells grown in 15N-containing growth medium for many generations were then allowed to grow in 14N-containing medium. Suppose they would have conducted the experiment the other way around: that is, to first grow bacterial cells in 14N-containing medium for many generations and then switching them to a 15N-containing growth medium. After two generations of growth in 15N media the results of a CsCl density gradient centrifugation of the DNA would be expected to show one band of intermediate-density and one band of low-density (i.e. light band) one band of low density (i.e. light band), one band of intermediate density, and one band of high density (i.e. heavy band). one band of intermediate density and one band of high-density (i.e. heavy band) one band on intermediate density one band of low density (i.e. light band) and one band of high density (i.e. heavy band). O O