PrepTest 122, Section 3, Question 23
Every culture that has adopted the cultivation of(465 more words not shown)
Assuming that all other relevant(41 more words not shown)
- AWater is split(13 more words not shown)
- BAn enzyme with(9 more words not shown)
- CThe vascular structures(13 more words not shown)
- DThe specialized chlorophyll-containing(13 more words not shown)
- EAn enzyme that(17 more words not shown)
Reading the passage
What advantage are we trying to reproduce? Oxygen can bind to rubisco and disrupt sugar production. C-4 plants protect the enzyme through separation. My first thought is another way of keeping oxygen away from rubisco.
Working the answers
- A
Moving water splitting into bundle sheath cells doesn't establish protection for the sugar-making enzyme. Water splitting releases oxygen; unless we know that oxygen is kept away from rubisco, naming a new location doesn't solve the problem. The reference to bundle sheath cells alone isn't enough.
- BCorrect
This refines our prediction: it changes the enzyme rather than keeping oxygen away from it. If the replacement performs rubisco's job but oxygen cannot bind to it, oxygen can no longer interfere in the way described. That's the same advantage through a different mechanism.
- C
The vascular structures are the leaf's transport structures, not the cells containing rubisco. Making them impermeable doesn't establish that oxygen is prevented from binding to the enzyme.
- D
Placing the water-splitting structures around the vascular structures still doesn't tell us that oxygen and rubisco are kept apart.
- E
This targets carbon dioxide, which is needed for making sugars. The interference we're trying to avoid comes from oxygen. Making an enzyme less ready to react with carbon dioxide doesn't solve that identified problem.
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