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    Question

    The many mutations that have so far been avoid (A) in

    RBD help the novel coronavirus identified (B) detection, but there’s also a trade-off in that too many changes affect the bind (C) with which the RBD can efficiency (D) onto the human cell. Directions: In each of the questions given below, four words are given in bold. These four words may or may not be in their correct position. The sentence is then followed by options with the correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct. Find the correct combination of words that replace each other. If the sentence is correct as it is, select ‘E’ as your option. 
    A Only A-B Correct Answer Incorrect Answer
    B Only C-D Correct Answer Incorrect Answer
    C A-C and B-D Correct Answer Incorrect Answer
    D A-B and C-D Correct Answer Incorrect Answer
    E No exchange required Correct Answer Incorrect Answer

    Solution

    A is grammatically incorrect at A. B suits A. so, A-B can be interchanged. Also, C and D are incorrect at their places. So, they also need to be interchanged. The many mutations that have so far been identified in RBD help the novel coronavirus avoid detection, but there’s also a trade-off in that too many changes affect the efficiency with which the RBD can bind onto the human cell.

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