PrepTest 122, Section 3, Question 27
Every culture that has adopted the cultivation of(465 more words not shown)
The passage provides the most(8 more words not shown)
- AIn many plants,(13 more words not shown)
- BA rubisco molecule(4 more words not shown)
- CRubisco is needed(10 more words not shown)
- DIn maize, rubisco(12 more words not shown)
- ERubisco's role in(15 more words not shown)
Reading the passage
We need one more supported statement about the process. Keep the roles distinct: rubisco helps make sugars, oxygen can interfere with it, and C-4 provides protection. The question leaves the particular inference open, so we'll need to check which additional claim follows.
Working the answers
- ACorrect
The explanation first describes oxygen's ability to interfere with rubisco, then contrasts that problem with certain plants' protective separation. That contrast supports the inference that many plants lack this airtight isolation. Otherwise, the general problem and the special C-4 solution would lose their distinction.
- B
Four carbon atoms describes the C-4 intermediary. We aren't given the number of carbon atoms in rubisco.
- C
The stated job of rubisco is to assist the sugar-forming reaction. Nothing assigns it the earlier conversion of carbon dioxide into the nongas intermediary.
- D
Rubisco is what needs protection from oxygen. The separation protects it; the enzyme isn't itself described as a defense against oxygen buildup.
- E
A high oxygen concentration relative to carbon dioxide is the condition that can interfere with rubisco's work. C-4 protects against that interference. That does not establish that the enzyme works best when oxygen is high.
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