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ATI TEAS 7

Biology

1. Homologous structures are those that:

Correct answer: C

Rationale: Rationale: - Option A is incorrect because structures with the same function but different origins are analogous structures, not homologous structures. - Option B is incorrect because structures with different functions but the same origin are also not homologous structures; they are considered to be vestigial structures. - Option D is incorrect because structures that are identical in both appearance and function are not necessarily homologous; they could be the result of convergent evolution. Homologous structures are those that share similarities in appearance and function due to being inherited from a common ancestor. These structures may have undergone modifications over time to adapt to different functions in different species, but their fundamental similarities can be traced back to a shared evolutionary history.

2. 1. An object is initially at rest. Which of the following will definitely NOT cause it to move?

Correct answer: B

Rationale: No force acting on it. According to Newton's first law of motion, an object at rest will stay at rest unless acted upon by a net force.

3. Identify the type of clause in the sentence "When the clock struck midnight, the magic began."

Correct answer: B

Rationale: The "when" clause introduces additional information about the main sentence and acts as a subordinate clause.

4. Melanin, the pigment responsible for skin color, is produced by

Correct answer: B

Rationale: The correct answer is B: Melanocytes. Melanin, the pigment responsible for skin color, is produced by melanocytes, which are specialized cells located in the skin's epidermis. Melanocytes transfer melanin to keratinocytes, the predominant cell type in the epidermis, where it provides protection against UV radiation. Sebocytes produce sebum, an oily substance that helps moisturize the skin and hair. Langerhans cells are a type of immune cell that play a role in the skin's immune response. Therefore, the correct answer is B as melanocytes are specifically responsible for producing melanin.

5. Identify the independent clause in the following sentence: "While the chef prepared dinner, the guests chatted and enjoyed the music."

Correct answer: B

Rationale: An independent clause expresses a complete thought and can stand alone as a sentence.

6. Which type of reaction is represented by the equation A + B → AB?

Correct answer: a

Rationale: Synthesis reactions involve the combination of two or more substances to form a new compound.

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