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Question

Difficulty: EasyIdiomatic Word Choice

Although the team had initially planned to examine multiple variables, the lead researcher decided to focus at the effects of temperature on the enzyme's stability. Which of the following is the most appropriate choice to replace the underlined portion?

  1. A
    focus at
  2. focus onAnswer
  3. C
    focus in
  4. D
    focus to

Answer

focus on
The correct answer is the option containing 'focus on' because the verb 'focus' idiomatically requires the preposition 'on' when describing the act of directing concentration or attention toward a specific subject, such as the effects of temperature.

Step-by-Step Solution

1
Identify the verb in the underlined portion and the relationship it establishes with the following noun phrase.
The verb is 'focus', and it introduces 'the effects of temperature'.
This determines which preposition is required to establish the correct idiomatic relationship.
2
Evaluate the idiomatic combination of 'focus' with different prepositions to see which is correct.
The verb 'focus' requires the preposition 'on' when it means concentrating attention or effort on something.
Prepositional idioms are fixed and must match established usage.

Key Concept

Idiomatic Preposition Usage with Verbs
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Topics

Idiomatic Word Choice

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