LSAT 110 – Section 3 – Question 22

LSAT 110 - Section 3 - Question 22

June 2001

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Question QuickView	Type	Tags	Answer Choices	Curve	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT110 S3 Q22	+LR	Must be false +MBF Quantifier +Quant	A 10% 162 B 11% 163 C 6% 160 D 8% 162 E 65% 169	151 161 170	+Hardest	145.976 +SubsectionMedium

Viruses can have beneficial effects. For example, some kill more-complex microorganisms, some of which are deadly to humans. But viruses have such simple structures that replacing just a few of a beneficial virus’s several million atoms can make it deadly to humans. Clearly, since alterations of greater complexity than this are commonly produced by random mutations, any virus could easily become dangerous to humans.

Summary

Viruses can have beneficial effects.
Some viruses kill more-complex organisms. Some of these more-complex organisms that are killed by viruses are deadly to humans.
Viruses have simple structures. Modifying these structures can make a virus deadly to humans.
Random mutations commonly produce changes in the structures of viruses.
Any virus can easily become dangerous to humans.

Notable Valid Inferences

There’s no clear inference to draw. I’d rely on process of elimination to identify what must be false.

Random mutation makes some deadly viruses beneficial to humans.

Could be true. We know mutations can make viruses dangerous. That doesn’t mean mutations can’t make deadly viruses beneficial.

Some organisms of greater complexity than viruses are no more likely than viruses to undergo significant alterations through random mutation.

Could be true. It’s possible that there are some viruses that are less likely or equally likely as viruses to undergo major changes from mutations. We were never told that viruses are the least likely to undergo major changes from mutation.

Some microorganisms that are more complex than viruses are beneficial to humans.

We know some microorganisms that are more complex than viruses can kill humans. But there could be other microorganisms that are more complex than viruses that are beneficial to humans.

Some viruses that fail to kill other viruses that are deadly to humans are nevertheless beneficial to humans.

Could be true. Some viruses could be beneficial in other ways besides killing organisms that are deadly to humans. That was just one example of a benefit.

No virus that is deadly to organisms of greater complexity than itself is beneficial to humans.

Must be false. We know some viruses kill more-complex organisms that are deadly to humans. So these viruses are beneficial to humans by killing organisms that might kill humans.

LSAT 110 – Section 3 – Question 22

LSAT 110 - Section 3 - Question 22

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LSAT PrepTest 110 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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