Question

1. 1-mcp works by limiting a fruit’s production of ethylene, a chemical that causes fruit to ripen and eventually rot. however, some fruits, particularly those that naturally produce a large amount of ethylene, do not respond as well to 1-mcp treatment. take bartlett __ unless they are treated with exactly the right amount of 1-mcp at exactly the right time, they will remain hard and green until they rot, and consumers who experience this will be unlikely to purchase them again. a) pears, for instance, b) pears, for instance: c) pears for instance, d) pears. for instance, 11. __ to exciting travel and teaching opportunities, and working to decontaminate water supplies around the world is a rewarding experience for those who undertake it. a) a career in water chemistry leading b) careers in water chemistry leading c) a career in water chemistry can lead d) a career in water chemistry that leads

Explanation:

Question 10

To solve this, we analyze punctuation and phrase structure. "for instance" is a parenthetical phrase, so we need appropriate punctuation. Option A uses a comma after "pears" and before "for instance", which is correct for an appositive phrase. Option B uses a colon which is incorrect here. Option C lacks a comma after "pears". Option D uses a period, which breaks the sentence incorrectly.

We need to check subject - verb agreement and sentence structure. The sentence has a singular subject "a rewarding experience", so the subject of the main clause should be singular. Option A: "leading" is a participle, and the structure "A career... leading... and working..." is parallel and correct. Option B: "Careers" is plural, but the predicate "is" is singular, so subject - verb agreement is violated. Option C: "can lead" creates a run - on or incorrect structure as the second part of the sentence starts with "and working...". Option D: "that leads" is incorrect as it creates a relative clause that doesn't fit the parallel structure with "working...".

Answer:

A) pears, for instance,

Question 11