Virulence genes distinguish pathogenic bacteria from closely related non-pathogenic speci Show more QUESTION 1 Virulence genes distinguish pathogenic bacteria from closely related non-pathogenic species.

Virulence genes distinguish pathogenic bacteria from closely related non-pathogenic speci Show more QUESTION 1 Virulence genes distinguish pathogenic bacteria from closely related non-pathogenic species.

True*** False 1 points QUESTION 2 Secreted antibodies are produced by ________. a. T cells b. T & B cells c. B cells d. dendritic cells 1 points QUESTION 3 MAP kinase kinase kinase activates MAP kinase kinase by dephosphorylation. True False*** 1 points QUESTION 4 The neurotransmitter acetylcholine causes the same response in all cells. True False*** 1 points QUESTION 5 Some signaling molecules are transmembrane proteins. True False*** 1 points QUESTION 6 Lysosomes are believed to have originated from the engulfment of bacteria specialized for digestion. True False I put false *** 1 points QUESTION 7 What type of molecule is not a ligand for G protein coupled receptors? a. steroid *** b. odorant c. neurotransmitter d. peptide hormone 1 points QUESTION 8 Adenylyl cyclase produces the second messenger ________. a. cAMP *** b. calcium c. cGMP d. IP3 1 points QUESTION 9 The local mediator nitric oxide stimulates the intracellular enzyme guanylyl cyclase by a. activating a G protein. b. activating a receptor tyrosine kinase. c. diffusing into cells and stimulating the cyclase directly. *** d. activating an intracellular protein kinase. 1 points QUESTION 10 Exposure to a foreign antigen such as a virus or pathogenic bacteria is sufficient to activate B cells to become effector B cells. True I put True False *** 1 points QUESTION 11 Edema factor (anthrax toxin) mediates a covalent modification of G proteins that renders them permanently active and leads to a dramatic increase in cAMP levels. True I put true *** False 1 points QUESTION 12 Phosphorylation of the cytosolic tail of G protein coupled receptors serves as a docking site for G proteins. True *** *** False 1 points QUESTION 13 The following are mechanisms that reduce the cellular response to a signal. a. receptor inactivation b. receptor down regulation c. inactivation of signaling protein d. All answers are correct. *** *** 1 points QUESTION 14 The sequence Lys-Asp-Glu-Leu (KDEL) serves as an ER retention signal for proteins by binding to KDEL receptors that 1. hold the proteins in both transitional ER & rough ER & prevent their transport to the Golgi. 2. hold the proteins in the rough ER. 3. transport the proteins from the Golgi apparatus back to the ER. **** *** 4. hold the proteins in the transitional ER. 1 points QUESTION 15 Phosphorylated tyrosines are present in the binding sites for the modular interaction ________ domain. a. SH1 b. SH2 **** *** c. PH d. SH3 1 points QUESTION 16 N-linked oligosaccharides on secreted glycoproteins are attached to ________. a. the N-terminus of the protein b. the asparagine in the sequence Asn-X-Ser/Thr *** *** c. nitrogen atoms in the polypeptide backbone d. the serine or threonine in the sequence Asn-X-Ser/Thr 1 points QUESTION 17 When the intracellular concentration of calcium is high calcium binds to calmodulin and then the calcium-bound calmodulin binds to and activates CaM kinases. True **** *** False 1 points QUESTION 18 The r

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