Question

The capacity of embryonic stem cells to develop into most types of human tissue, which makes them potentially valuable for medical applications, but the genetic program that underlies this quality is not yet known.

• A. tissue, which makes them
• B. tissue makes them
• C. tissues, which make them
• D. tissue, making them
• E. tissue make it

Hint:

When using relative clauses, ensure subject-verb agreement is maintained, especially with singular or plural nouns.

Answer 1

The Correct Option is A

Step 1: Understanding the sentence structure.
The sentence describes embryonic stem cells and their potential. The phrase "which makes them" modifies the noun "tissue," meaning "tissue" is singular. Thus, we need to use the singular form "tissue" and the correct relative clause.

Step 2: Analysis of options.
- (A) tissue, which makes them: Correct. "Tissue" is singular and is followed by the relative clause "which makes them." This maintains proper subject-verb agreement.
- (B) tissue makes them: Incorrect. The clause is incomplete and disrupts the meaning.
- (C) tissues, which make them: Incorrect. "Tissues" is plural, which is inconsistent with the singular subject.
- (D) tissue, making them: Incorrect. The participial phrase "making them" does not fit smoothly in this sentence structure.
- (E) tissue make it: Incorrect. The verb "make" is not appropriate with a singular subject "tissue."

Step 3: Conclusion.
The correct answer is (A) tissue, which makes them.

Final Answer: \[ \boxed{(A) \, \text{tissue, which makes them.}} \]