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)............................. species, it's like a product barcode in a supermarket. As animals and plants live their lives, they (4)................................. their DNA into their environment (5)................................. to each fragments of 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. 1.

• A. acts
• B. keeps
• C. delivers
• D. present

Answer 1

Answer:

A. acts

• Context of the Sentence: The sentence states: "It (1) ............ as the code for all life on Earth..." In biology and general English, when we describe the function or role of something, we use the phrase "acts as." This means to serve a particular purpose or to perform a specific function. 2. Why 'acts' is the answer: Subject-Verb Agreement: The subject is "It" (singular), so the verb must be the singular form "acts." Collocation: The preposition "as" following the blank is a strong indicator. We say something "acts as," "functions as," or "serves as." Meaning: DNA performs the role of a biological "instruction manual" or code.