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13. The statements below describe conditions required for some molecules to move into a cell. 1. a concentration gradient 2. use of ATP Which of these statements is correct for the process of osmosis? A. 1only B. 2 only C. 1and 2 D. Neither 1 nor 2

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13. The statements below describe conditions required for some molecules to move into a cell.
1. a concentration gradient
2. use of ATP
Which of these statements is correct for the process of osmosis?
A. 1only
B. 2 only
C. 1and 2
D. Neither 1 nor 2

13. The statements below describe conditions required for some molecules to move into a cell. 1. a concentration gradient 2. use of ATP Which of these statements is correct for the process of osmosis? A. 1only B. 2 only C. 1and 2 D. Neither 1 nor 2

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SamuelProfessional · Tutor for 6 years

Answer

Thus, the correct answer should be "A. 1 only", since osmosis in cells requires a concentration gradient, but doesn't need the use of ATP for the process to occur.

Explain

## Step1:<br />We first need to understand what osmosis is. Osmosis is the process of movement of water from an area of low solute concentration to high solute concentration across a semi-permeable membrane. <br /><br />## Step2:<br />Next, it becomes clear whether this process requires an external energy source or not. As noted earlier my other answer (Example1), for osmosis, ATP (a form of energy) is not required, because it is a passive transport process.<br /><br />## Step3: <br />Lastly, reaffirm whether it requires a concentration gradient or not. The kinetic motion of particles allows them to move from high concentration regions to lower ones, naturally creating a 'gradient'. This forms the basis of osmosis too. Therefore, a concentration gradient is required for osmosis to occur.
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