Which of the following is the CORRECT relationship?
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- QUESTION 4 Which of the following G protein subunits activate K+ channels in response to the GPCR for acetylcholine on heart muscle? a. Galpha inhibitory. b. G alpha stimulatory c. G beta gamma dimer. d. G alpha transducin.QUESTION 29 Which of the following is NOT a primary method used to regulate the activity of cyclin-dependent kinases (cdks)? A. Binding to cyclins B. Binding to a CDK inhibitor C. Dephosphorylation of a specific amino acid D. Degradation by a proteasome E. Phosphorylation on a specific amino acidQUESTION 9 Which of the following is/are a motor protein(s) that can carry vesicles along microtubules? A Dynein B Kinesin C Myosin D Tau E A and B
- QUESTION 30 Which of the following methods can be used to regulate the activity of cyclin-dependent kinases (CDKs)? A. Phosphorylation at a specific amino acid B. Dephosphorylation at a specific amino acid C. Binding to cyclins D. A, B and C E. A and CQuestion 6 Which of the following statements about graded potentials and action potentials is true? Answers: a. Action potentials are triggered through the passive spread of membrane depolarization. b. Graded potentials can by produced by the net movement of Nat, CI, or K* across the plasma membrane. c. Graded potentials can occur as the result of either hyperpolarization of depolarization of the plasma membrane. d. All of the statements are true. e. The duration of a graded potential is related to the duration of the stimulus.QUESTION 12 What is most likely to occur in a cell when the levels of free GTP-bound tubulin subunits are very high in the cytoplasm? A The GTP cap on the end of the microtubules will shrink. B Microtubules will lengthen by adding tubulin subunits to their + ends. C The GTP-bound tubulin subunits will move into the nucleus. D Microtubules will undergo catastrophe and shorten. E Microtubules will lengthen by adding tubulin subunits to their - ends.
- QUESTION 10 Which of the following is NOT true of intermediate filaments? A They provide mechanical strength to cells. B They are composed of 8 oppositely oriented tetramers that are assembled into a rope-like filament. C They have a non-polar orientation. D They are rigid and do not deform before breaking E Keratins, neurofilaments, vimentin, and desmin are examples of intermediate filaments.QUESTION 35 What event occurs to divide the sister cells in two during cytokinesis? A. Constriction of the cell body by the sliding of myosin filaments on actin filaments. B. Contraction of the cell body by the shortening of actin and myosin filaments. C. Contraction of the cell body by shortening of the microtubules. D. Dissolving of the cytoplasm at the center of the cell body followed by polymerization of new actin filaments.QUESTION 20 You are studying the effects of removing integrins from cells. Which of the following abilities is the cell most likely to lose? A The cells are going to lose their ability to make connections with the ECM. B The cells will lose their ability to secrete growth factors. C The cells are going to lose their ability to form cell-cell adhesions. D The cells are going to lose their ability to communicate with the cytoskeleton.
- QUESTION 28 True or False? The "plaques and tangles" in brain tissue that define Alzheimer's disease, are made up of fat and cholesterol, as in cases of heart disease? True FalseQUESTION 14 Which of the following statements is FALSE? A Microtubules will rapidly disassemble in response to a drop in the ATP concentration. B G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. C Microtubules are stabilized by microtubule-binding proteins, such as Tau. D Actin-binding proteins allow F-actin to assemble in cells in many different ways. E Hydrolysis of ATP and GTP changes the conformation of the monomers once they are incorporated into actin filaments and microtubules, respectively.Question 24 pts When we are vaccinated against SARS-CoV-2, what happens? (select all correct answers) Group of answer choices a) Our adaptive immune system becomes primed to recognize the SARS-CoV-2 virus. b) Our DNA becomes modified. c) We will permanently have viral proteins in our cells d) Our cells will make a partial or complete viral protein, which our immune system will recognize as foreign. e) Memory cells will be ready for a new infection.