Frog poison. Batrachotoxin (BTX) is a steroidal alkaloid from the skin of Phyllobates terribilis, a poisonous Colombian frog (the source of the poison used on blowgun darts). In the presence of BTX, Na+Na* channels in an excised patch stay persistently open when the membrane is depolarized. They close when the membrane is repolarized. Which transition is blocked by BTX?
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- Plesae ASAP. thanku Which of the following is not true about the glutamate family of ligand-gated ion channels? a. members are AMPA, kinase, and NMDA channels b. they are cation permable c. channels subunits have 3 full transmembrane doamins d. they require 5 subunits to amke a functional channelOnly a few. Why do only a small number of sodium ions need to flow through the Na+Na* channel to change the membrane potential significantly?Please help me with this question. More than one answer may be correct. THe graph relating to the information is included below. The above figures show the rate of actin polymerization in the presence of various concentration of profilin (Pfn). In the top figure, flourescence intensity is a measure of total actin that has been polymerized, and this is plotted versus time in seconds. The shade of blue of the lines in the top figure correspond to the shaded blue bars representing various concentrations of profilin in the lower figure. The lower graph shows the initial rates of polymerization of actin plotted again concentration. Which of the following is true: Question 21 options: profilin in a molecular motor profilin is a promoter of actin polymerization profilin replaced G-actin in an F-actin strand and breaks the filament profilin is an inhibitor of actin polymerization profilin binds to G-actin, preventing it from polymerizing
- = 20 nM. The rate of receptor-ligand complex formation with an A receptor-ligand complex has a dissociation constant of Ka added ligand concentration of 10 µM is 5 × 10³ s¯¹. What is the value of the reverse rate constant, k_₁ ? k_₁ = 8-1From the image. Do you think that a membrane potential exists for this synthetic plasma membrane? If your answer is “yes,” please indicate whether it is negative or positive at the region closer to the inner leaflet of the plasma membrane. Explain your reasoning.Question. Explain the signal transduction mechanism for slow ligand-gated ion channels.
- Cell signaling. The ER doctors gave a patient an injection of epinephrine to increase his heart rate and blood pressure. The heart rate and blood pressure went up but not enough. The second dose of the same drug seemed not to have an effect. What do you think may be a possible explanation for this result?Please ASAp. Thankyou. Question 4 The resting membrane potential is a negative value because of: a. High K+ inside of cells compared to the outside b. Open K+ channels at rest c. Phospholipid head groups on the inside of the membrane d, High sodium outside the cellNeed help, please. I know the answer isn't mitotic spindle or secretory and endocytic vesicle transport. I think the answer is option C, axon stiffening, and neurotransmitter vesicle transport, but I am not 100% sure. What function of the microtubule motor proteins dynein and kinesin is blocked by the use of colchicine to treat gout? Select one: O a. mitotic spindle b. secretory and endocytic vesicle transport c. axon stiffening and neurotransmitter vesicle transport O d. ER, Golgi, and mitochondria movement
- nerve impulses. Neurotransmitters are packaged by the cell into small, membrane- bound sacs called vesicles. Upon receiving a chemical signal, the vesicles move towards the cell membrane and fuse with it, releasing the enclosed neurotransmitters from the terminal end of the nerve cell. Which organelle is most likely responsible for packaging neurotransmitters into a vesicle? Mitochondria Golgi body Ribosomes NucleusPlease help me with this question. PLEase give me the right answer and for number 2 WRITE AT LEAST A PARAGRAPGH and dont copy from internet.Please ASAP. Thankyou. Question 10 A hypothetical cation has a Nernst potential of -30 mV. At 0 mV, the cation flows in which direction? Into the cell Out of the Cell It does not flow