Anumber of systems for pumping ions across membranes are powered by atp. such atp-powered pumps are often called atpases, although they don't often hydrolyze atp unless they are simultaneously transporting ions. because small increases in calcium ions in the cytosol can trigger a number of different intracellular reactions, cells keep the cytosolic calcium concentration quite low under normal conditions, using atp-powered calcium pumps. for example, muscle cells transport calcium from the cytosol into the membranous system called the sarcoplasmic reticulum (sr). if a resting muscle cell's cytosol has a free calcium ion concentration of 10-7 while the concentration in the sr is 10-2, then how is the atpase acting?
a. atpase activity must be powering an inflow of calcium from the outside of the cell into the sr.
b. atpase activity must be transferring pi to the sr to enable this to occur.
c. atpase activity must be pumping calcium from the cytosol to the sr against the concentration gradient.
d. atpase activity must be opening a channel for the calcium ions to diffuse back into the sr along the concentration gradient.
e. atpase activity must be routing calcium ions from the sr to the cytosol, and then to the cell's environment.
Solved
Show answers
More tips
- F Food and Cooking Delight for Gourmets: How to Prepare Liver Pate...
- F Family and Home How to Remove Tar Stains: Tips and Recommendations from Experts...
- F Family and Home How to Remove Fading from Clothes: Tips and Tricks...
- S Sport How to Do a Jumping Split...
- H Health and Medicine How Did Inna Lose Weight on Dom 2?...
- F Family and Home How to Properly Fold Napkins in a Napkin Holder?...
- F Food and Cooking How to Set Up Ventrilo - The Ultimate Guide...
- S Science and Technology How to Make a Homemade Smoker: The Ultimate Guide...
- A Auto and Moto Battle for the Relocation of The Cherkizovsky Market: Who Won?...
- C Computers and Internet How Do You Refill Cartridges?...
Answers on questions: Biology
- B Biology 1. What do you predict Earth s interior is like? How do its rocks compare to rocks on the surface? Cite evidence that supports your prediction....
- B Biology how many years will it be before much of the world s topsoil is depleted to the point where agriculture will be unsustainable? A: 25 years B: 125 years C: 60 years D: 500...
- B Biology I WILL MARK BRAINLIEST PLZ HELP !! Which condition leads to a slower rate of weathering? O porous rocks O cold climates O hard minerals O high temperatures ( please explain...
- B Biology What do you think determines if a weather report is accurate or trustworthy?...
- B Biology I needed help on my answer...
- B Biology What phrases describe the mercator protection? check all that apply. a) is most commonly used b)sizes most feautures to scale c) presents longitude lines as parallel d)...
- B Biology Which characteristics of a population will most likely indicate the lowest potential for evolutionary change in that population...
- B Biology In a food chain, primary producers are usually (need fast) a. mammals b. amphibians c. bacteria d. plants...
- B Biology Lipids are hydrophobic molecules. cholesterol is an example of a lipid....
- B Biology What are the jobs of rrna, mrna, and trna?...
Ответ:
The correct answer is C ATPase activity must be pumping calcium from Cytosol to the sarcoplasmic reticulam(SR) against their concentration gradient.
Explanation:
The concentration of Ca2+ ion in Sarcoplasmic reticulam of muscle is many times higher than that of Cytosol.
Sarcoplasmic reticulam of muscle is a reservior of calcium ion (Ca2+) ions and after the occurance of muscle contraction Ca2+ are transported from low calcium concentration region that is cytosol to high calcium concentration region that is Sarcoplasmic reticulam through active transport by the help of ATPase enzyme.
Ответ:
D. Determining the species of a recently collected organism
Explanation:
Hope this will help