When the nerves deliver a signal to contract, Ca++ (calcium ions) rush into the cell. The calcium ion influx causes specialized fibers to contract. Afterward, calcium ions are pumped out of the cell by calcium ATPases. What transport type(s) is occuring?s antiporter only ion gated transport followed by active transport active transport only ion gated transport only active transport followed by ion gated transport

When the nerves deliver a signal to contract, Ca++ (calcium ions) rush into the cell. The calcium ion influx causes specialized fibers to contract. Afterward, calcium ions are pumped out of the cell by calcium ATPases. What transport type(s) is occuring?s antiporter only ion gated transport followed by active transport active transport only ion gated transport only active transport followed by ion gated transport

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 14RQ: Active transport must function continuously because_______. a. plasma membranes wear out b. cells...

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Which of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.
Active transport must function continuously because_______. a. plasma membranes wear out b. cells must be in constant motion c. facilitated transport opposes active transport d. diffusion is constantly moving the solutes in the other direction
List the means of unassisted membrane transport.
The principal force driving movement in diffusion is______. a. temperature b. particle size c. concentration gradient d. membrane surface area
A transport protein requires ATP to pump sodium ions across a membrane. This is a case of ______. a. passive transport b. active transport c. facilitated diffusion d. a and c
Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is higher than on side 2. Which of the following ionic movements would occur? a. Na+ would move until its concentration gradient is dissipated (until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). b. Cl- would move down its concentration gradient from side 1 to side 2. c. A membrane potential, negative on side 1, would develop. d. A membrane potential, positive on side 1, would develop. e. None of the preceding is correct.
Which of the following does not directly or indirectly require an energy source?a. primary active transportb. operation of the Na1/K1-ATPase pumpc. the mechanism used by cells to produce a calcium ion gradient across the plasma membraned. facilitated transport of glucose across a plasma membranee. secondary active transport
Active transport across membrane can be mediated by the following mechanisms: “Uphill” transport is powered by energy from photons. A solute is driven “uphill” compensated by a different solute being transported “downhill.” “Uphill” transport is powered by ATP hydrolysis. All of the above. None of the above.
Which of the following is true regarding bulk transport? ATP is required to pump molecules against the concentration gradient Bulk transport is an example of passive transport Transport of large quantities of materials ATP changes the shape of a protein channel during active transport
Passive transport across the membrane mediated by a carrier— would not be saturated by increasing amount of substance to be transported. does not require energy (ATP). can be driven in reverse. moves the solute through the membrane in the “uphill” direction of their concentration gradient. is faster than transport mediated by channel proteins.
If the fluid within a cell contains a lower concentration of dissolved solutes compared to the external fluid surrounding the cell, we say that the cellular fluid is ________ relative to the external fluid, and water will ________ the cell. hypertonic / flow into hypertonic / flow out of hypotonic / flow into hypotonic / flow out of isotonic / have the same flow rate into and out of
Active transport is different from passive transport because a. no additional energy is required. b. molecules move from low concentration to high concentration. c. ions are involved. d. proteins are involved. e. water is moved across the membrane.