PrepTest 110, Section 1, Question 14
In the eighteenth century the French naturalist Jean(442 more words not shown)
According to the passage, which(23 more words not shown)
- Ainvulnerability to carbon(2 more words not shown)
- Bsusceptibility to carbon(2 more words not shown)
- Clack of cell(1 more words not shown)
- Dpresence of cell(1 more words not shown)
- Epossession of certain(1 more words not shown)
Reading the passage
Which example changes how genes interact without changing the genes themselves? Go back to paragraph 2: removing a bacterium's wall disrupts the process that normally builds and breaks down its walls. It then grows and multiplies without walls. Paragraph 3 introduces a different mechanism, adding or eliminating genetic material.
Working the answers
- A
The fruit-fly example does mention resistance to carbon dioxide. But that results when warmth eliminates a virus from the eggs. It belongs to the gene-addition-or-elimination discussion, not the interaction mechanism we need.
- B
Susceptibility comes from a virus introducing a gene into fruit flies. Adding a gene is precisely what the question tells us to distinguish from altering interactions among existing genes.
- CCorrect
The last sentence of paragraph 2 says the inherited absence of cell walls results from altered relationships between genes, without changes to the genes themselves. That matches both parts of the question.
- D
The experiment produces an absence of walls. Presence is the opposite result.
- E
A plasmid is defined as a small ring of genetic material that enters another bacterium and becomes part of its genetic makeup. That is acquiring genetic material, not just changing how existing genes interact. We don't need outside biology knowledge to make that distinction.
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