ATI TEAS 7
Biology
1. What is the shape of the DNA molecule?
- A. Linear
- B. Circular
- C. Double helix
- D. Straight chain
Correct answer: C
Rationale: Rationale: The shape of the DNA molecule is a double helix. This structure was first described by James Watson and Francis Crick in 1953. The double helix shape consists of two strands that are twisted around each other in a spiral. This shape allows DNA to be compactly stored within the cell nucleus and provides stability to the molecule. The other options (A) Linear, (B) Circular, and (D) Straight chain do not accurately describe the shape of the DNA molecule.
2. Which part of the brain is responsible for regulating heart rate, breathing, and swallowing?
- A. Cerebrum
- B. Cerebellum
- C. Medulla oblongata
- D. Thalamus
Correct answer: C
Rationale: The correct answer is C: Medulla oblongata. The medulla oblongata is located at the base of the brainstem and is responsible for regulating essential functions such as heart rate, breathing, and swallowing. It contains vital control centers for these automatic processes, making it a critical part of the brain for maintaining life. The cerebrum is primarily involved in higher brain functions such as thinking and voluntary movement, while the cerebellum helps with coordination and balance. The thalamus acts as a relay station for sensory information. Therefore, the medulla oblongata is the most appropriate choice for regulating these basic physiological functions.
3. Based on the passage, the author most likely believes that
- A. Individual actions are insignificant in addressing climate change, and only large-scale initiatives matter.
- B. Adaptation to the changing climate is impossible, and societal collapse is inevitable.
- C. Transitioning to renewable energy and sustainable practices offers hope for mitigating climate change.
- D. The scientific evidence for climate change is unreliable, and further research is needed before taking action.
Correct answer: C
Rationale: The focus on global efforts, renewable energy, and sustainable practices suggests an optimistic outlook on mitigating climate change, aligning with C.
4. A hypothesis should be:
- A. A definitive statement of fact based on existing knowledge.
- B. A testable prediction based on observations and reasoning.
- C. A broad question without any specific direction or focus.
- D. A personal belief or opinion not requiring further investigation.
Correct answer: B
Rationale: Hypotheses guide scientific exploration by providing a framework for testing potential explanations.
5. When you push a book across a table, the book experiences an equal and opposite force from the table. Why doesn't the table move as well?
- A. The table is much heavier than the book.
- B. The force on the book acts in a different direction.
- C. The table has a much larger surface area, distributing the force over a wider area
- D. All of the above
Correct answer: C
Rationale: While Newton's third law states that for every action, there is an equal and opposite reaction, the unbalanced force acting on each object depends on their respective masses. The larger mass of the table (compared to the book) experiences a smaller acceleration, making its movement almost imperceptible.
6. What is the relationship between work and the displacement of an object?
- A. Work depends only on the force applied, not displacement
- B. Work is directly proportional to displacement
- C. Work is inversely proportional to displacement
- D. Work is unrelated to displacement
Correct answer:
Rationale: Work done is directly proportional to the displacement of an object in the direction of the force applied.
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