Question

Comprehension: In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. Deoxyribonucleic acid (DNA) is a very special molecule. It (1)__________________ as the code for all life on Earth, holding the cellular instructions to (2)______________ everything from a beetle to a human. Because DNA is (3)_________________ to each species, it’s like a product barcode in a supermarket. As animals and plants live their lives, they (4)________________ fragments of their DNA into their environment (5)_________________ dead skin, hair, saliva, scat, leaves or pollen. These traces make up environmental DNA. There’s enough DNA in water and even air to tell species apart. Select the most appropriate option to fill in blank no. 3.

• A. usual
• B. unique
• C. slight
• D. common

Answer 1

Answer:

B. unique

• Context of the Sentence: The passage states: "Because DNA is (3)_________________ to each species, it’s like a product barcode in a supermarket." 2. Why 'unique' is the answer: The Comparison: The passage compares DNA to a barcode. In a supermarket, every different product has its own specific barcode that belongs only to that product. Scientific Accuracy: Every species has a genetic sequence that is distinct and specific to it. "Unique" means being the only one of its kind or belonging specifically to one group. Meaning: If DNA were "usual" or "common," we wouldn't be able to "tell species apart" (as mentioned at the end of the passage).