Final answer:
The bolded simile highlights Frankenstein's fear of his own Creation.
Step-by-step explanation:
The effect of the bolded simile in the passage is that it highlights Frankenstein's fear of his own Creation. When Frankenstein compares himself to a child expecting a specter behind a door, it reveals his uneasiness and apprehension. This simile illustrates Frankenstein's lack of control over his own Creation and the sense of foreboding he feels.
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