10-Which of the following statements is incorrect? a. In an isotonic solution, t
ID: 52329 • Letter: 1
Question
10-Which of the following statements is incorrect?
a. In an isotonic solution, the movement of water into a cell is counterbalanced by an equal amount of water moving out Of the cell.
b. Even though water freely moves through the membrane, some organisms use aquaporins to transport water.
C. A cell wall offers protection from the effects of a hypotonic environment, but not a hypertonic environment.
d. According to the second law of thermodynamics, energy cannot be created or destroyed, but can be converted into another form.
e. Cholesterol is a mostly hydrophobic molecule that, when inserted into the membrane, can affect membrane permeability.
11-Consider an element with an atomic mass Of 20 and an isotope of that element with an atomic mass of 25. Which statement best describes the formation of this isotope?
a. The number of electrons increased.
b. The number of protons increased.
c. The number of neutrons increased.
d. All of the above are correct
e. None of the above are correct
12 -Which of the following statements concerning competitive inhibitors is correct?
a. The inhibitor binds at the active site, blocking substrate access to the active site.
b. The inhibitor binds at the active site causing the active site to change configuration.
"c. The inhibitor binds at the allosteric site, blocking substrate access to the active site.
d. /The inhibitor binds at the allosteric site causing the active site to change configuration.
e. The inhibitor binds to the substrate, preventing it from entering the active site.
13- Which of the following statements concerning transport is correct?
a. Group translocation involves the movement of many molecules at one time.
b. Both facilitated diffusion and active transport require integral membrane proteins.
c. Both channel proteins and carrier proteins undergo a conformational change when transporting solutes from an area of low concentration to an area of high concentration.
d. Two of the above are correct
e. None of the above are correct
14-You want to radioactively label proteins to study. This is done by growing cells in the presence of the radioacüve element. Cells then use that radioactive element when making different macromolecules.
Which element would you want to use so only proteins will be radioactive?
a. sulfur
b. nitrogen
c. phosphorus
d. carbon
e. oxygen
15. You start an experiment with a solution at pH 6. At the end of the experiment, you determine the hydrogen ion concentration changed by 10000. What is the pH of the resulting solution'?
a.3
b. 4
c. 9
d. 10
e. Two of the above are possible
16. Which of the following accurately describes the effect of a hypertonic environment on a plant cell?
a. The flow of water into the cell will lead to osmic lysis.
b. The flow of water into the cell will lead to plasmolysis.
c. The loss of water from the cell will lead to plasmolysis.
d. The loss of water from the cell will lead to osmotic lysis.
Explanation / Answer
Answer:
10) C. A cell wall offers protection from the effects of a hypotonic environment, but not a hypertonic environment.
11)b. The number of protons increased.
12)a. The inhibitor binds at the active site, blocking substrate access to the active site.
13) d. Two of the above are correct
14) a. sulfur S35
15) d. 10
16) c. The loss of water from the cell will lead to plasmolysis.
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