A genetic mutation that results in abnormal stimulatory G protein (Gs) structure would adversely affect which of the following mechanisms? A. Active transport B. Facilitated diffusion C. Pinocytosis D. Receptor-mediated endocytosis E. Signal transduction L H 12 W P
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- Which of these statements about ion movement through the plasmamembrane is true?a. Movement of Na+ out of the cell requires energy (ATP).b. When Ca2+binds to proteins in ion channels, the diffusion of Na+into the cell is inhibited.c. Specific ion channels regulate the diffusion of Na+ through theplasma membrane.d. All of these are trueThe Na/K pump in epithelium cells that line the gut is an example of ______ transport and helps __ Select one: a. active, prevent the movement of Cl- outside the cell b. active, prevent the movement of Cl- inside the cell c. active, prevent the movement of Na+ outside the cell d. passive, prevent the movement of Cl- outside the cell e. passive, prevent the movement of Cl- inside the cellWhich of the following statements about "leak channels" in the plasma mem- brane is correct? A. Proteins that form these channels bind to solutes to allow them to pass into the cell. B. They are passageways formed by proteins to allow water and ions to move passively through the membrane. C. They allow small ions and molecules to move between adjacent cells. D. They are formed by glycoprotein and proteoglycans to allow hormones to enter cells.
- Which of these statements about facilitated diffusion is true?a. In facilitated diffusion, net movement is down the concentrationgradient.b. Facilitated diffusion requires the expenditure of energy.c. Facilitated diffusion does not require a carrier protein.d. Facilitated diffusion moves materials through ion pumps.e. Facilitated diffusion moves materials in vesicles.Glucose is transported across the cell membrane of intestinal cells. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells? A facilitated diffusion B simple diffusion C osmosis D concentration gradientHeparan sulfate proteoglycans appertain to which of the following processes?*a. transport by argosomesb. transport by cytonemesc. restricted diffusiond. simple diffusion The model for planar transcytosis is characterized by which of the following?* a. Morphogen-receiving cells employ long actin-based filopodia. b. Morphogens interact with cell surface receptors and coreceptors. c. Lipid-modified morphogens are transported in lipoprotein vesicles. d. Morphogens are transported by repeated rounds of endocytosis and re-secretion. Metamerism is NOT observed in which of the following structures?* a. acron b. rhombomeres c. somites d. vertebral column The anterior structure of the Drosophila is promoted by which of the following events?* a. nanos proteins block the transcription of the caudal gene. b. caudal proteins promote the transcription of the bicoid gene. c. bicoid proteins promote transcription of the…
- Below is a list of molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (slowest < fastest). Alanine (amino acid), estrogen (steroid), Propanol (alcohol), sodium (salt) O a. estrogen < sodium < propanol < alanine O b. estrogen < propanol < alanine < sodium O c. alanine < propanol < sodium < estrogen O d. sodium < alanine < propanol < estrogenLiver cells in culture were kept at 0°C and treated with trypsin to digest the receptors on the cell surface. The temperature was then raised to 37°C and radioactive LDL was added to the culture media. Several hours later, the labeled LDL was found to be inside the cells. This specific process of LDL uptake is A. active transport B. facilitated diffusion C. phagocytosis D. pinocytosis E. receptor-mediated endocytosisone reason active transport has a limited maximum transport rate at which it can progress is due to the fact that a. energy required is not available inside the cell b. carrier proteins are not on the surface of the cell membrane c. ion channels are limited in size d. the number of carrier proteins is limited and therefore they can become saturated
- Which of these statements about carrier-mediated facilitated diffusion is true? a. It uses cellular ATP. b. It is used for cellular uptake of blood glucose. c. It is a form of active transport. d. None of these are true.When the slime mold receives its own autocrine signal of CAMP the response is the activation of transcription of transmembrane adhesion molecules. These adhesion molecules need to be transcribed, translated and shipped to the plasma membrane. This response is an example of O a endocytosis O b. exocytosis Oc. phagocytosis Od. endosomal recyclingHere is a chloride cell in the gill epithelium of a fish. For reference, NKA = Na+/K+ ATPaseNKCC = Na+/K+/Cl- cotransporter. The NKCC (Na+ K+ Cl- cotransporter) moves Cl- into the cell against its concentration gradient. What type of transport does NKCC carry out?A. passive diffusionB. facilitated diffusionC. secondary active transportD. primary active transport