. The average human generates approximately his or her weight in ATP every day. A resting person uses about 25% of this in ion transport- mostly via the Na+-K* ATPase. About how many grams of Na+ and K* will a sedentary 70-kg person pump across membranes in a day?
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- A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot transport a substance and also hydrolyze ATP. b. they retain their same shape as they perform different roles. c. their primary role is to move negatively charged ions across membrances. d. they move Na+ into a neural cell and K+ out of the same cell. e. they act to establish an electrochemical gradient.Secondary active transport … A. Moves a molecule against its chemical gradient but with its concentration gradient. B. Moves a molecule against its concentration gradient but with its chemical gradient. C. Uses ATP to directly move molecules against their electrochemical gradient. D. Uses an electrochemical gradient of one molecule to power movement of a different molecule against its electrochemical gradient.If a skeletal muscle has depleted its stores of ATP how will the altered transport properties of the following transporters affect cytosolic ion concentrations (increase, decrease, no change) relative to normal? Skeletal Muscle Cell With Depleted ATP Stores Ion transporter Cytosolic K+ Cytosolic Na+ Cytosolic Ca2+ NKA NCX SERCA
- Practice concentration gradients: A) Active tissues generate carbon dioxide during cell respiration. This carbon dioxide diffuses out of the tissue into the bloodstream. 1) where is the higher concentration of carbon dioxide ? 2) is Carbon dioxide flowing down or against its concentration gradient ? 3) Is energy required for the movement of carbon dioxide ? Calculate concentration gradient solute 55M Solute 52MCalcium ions (Ca?+) are a typical cell at rest. a. more concentrated in the cytosol of b. equally distributed across the membrane of c. more concentrated in the extracellular fluid ofThe Na+/glucose cotransporter in ION-GRADIENT-DRIVEN ACTIVE TRANSPORT, ________moves down its gradient and _______ against its gradient. Na+/K+ Na+/Na+ Na+/glucose glucose/glucose
- The most common fatty acid that exists in coconut oil is a fatty acid called lauric acid. This is a 12 carbon saturated (12:0) fatty acid. How many net ATP are produced from the complete oxidation of a single molecule of lauric acid after it enters into a muscle cell? Show steps pleaseCompared to NADH, NAD is a ____ molecule. If the Na/K pump stopped working, there would be an immediate and temporary net____ in cellular ATP . Select one: a. Oxidized, decrease b. Oxidized, increase c. Reduced, decrease d. Reduced, increasehelp fill in these blanks in [] Sodium-potassium ATPases are [passive/active] transporters that move sodium and potassium [with/against] their electrochemical gradients. In other words, potassium and sodium transport, without any coupled process, are [endergonic/exergonic] processes. These transporters are [primary active/facilitated/secondary active] transporters meaning that the transport process is coupled to [ATP hydrolysis/ion diffusion] to make the process spontaneous. P-type ATPases are [acid-base/covalent/nucleophilic] catalysts that become phosphorylated during the transport cycle. The sodium-potassium ATPase moves [3/2/1] cations out of the cell for every [1/2/3] cations it moves into the cell, polarizing the membrane such that the inside is [positive/negative] compared to the outside.
- For this practice problem, would the answer be c)NaCl? My reasoning behind this is because molecules under 100 Da can use simple diffusion, while nonpolar molecules and larger molecules like benzene can use channels via facilitated diffusion. However, NaCl dissociates into ions and cannot readily use diffusion?The average cell at rest hydrolyzes 10,000,000 ATP molecules per second.You are studying the stem cell population found in intestinal Crypts.In the intestine there are s total 5x10^11 cell.The stem cells have a 85% higher metabolism than an average resting cell.ATP hydrlysis yield 7.4 kCal/Mole ATP(Avogadro's number is 6.023x10^23) How many moles of ATP are hydrolyzed per second? The answer should be 7.06 x 10^-6 moles/sec I believe, but I don't know how to get to that answer How many Kcal of energy are used per day by this population of cells? The answer for this one should be 4.514 kCal/day. Assuming 32 ATP per glucose oxidative metabolically how many moles of glucose are consumed per day?Describe why ATP, the molecule that serves as the energycurrency for the body, has an intermediate phosphoryl grouptransfer potential.