Explain the active transport involved in sodium-potassium pumps
What will be an ideal response?
Nearly all of the cells in your body have sodium-potassium pumps. Sodium ions in cytoplasm diffuse into the pump's open channel and bind to its interior. A phosphate-group transfer from ATP causes the pump to change shape so that its channel opens to extracellular fluid, where it releases the sodium ions. Then, potassium ions from extracellular fluid diffuse into the channel and bind to its interior. The transporter releases the phosphate group and reverts to its original shape. The channel opens to the cytoplasm, where it releases the potassium ions.
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Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells. Which of the following would be a likely mechanism by which this pesticide works?
A) The mosquito would develop a weakened exoskeleton that would make it vulnerable to trauma. B) The mosquito would have trouble digesting food, due to impaired gut function. C) The mosquito would have trouble with respiration and circulation, due to impaired muscle function. D) The mosquito wouldn't be affected at all.
Each gamete gets only one copy of an allele because it has ____
a. one copy of each chromosome b. one nucleus c. one chromosome d. a diploid number of chromosomes e. either an X or a Y
Which of the following is a FALSE statement concerning amino groups? Amino groups _____
A) are basic with respect to pH B) are found in amino acids C) contain nitrogen D) are nonpolar
Energy released by the electron transport chain is used to pump H+ ions into which location?
A. cytosol B. mitochondrial matrix C. mitochondrial outer membrane D. mitochondrial inner membrane E. mitochondrial intermembrane space