ATI TEAS 7
ATI TEAS Science Questions
1. Anya was paid by Company X to analyze dwindling honeybee populations in the Southwest. After measuring hive populations over several months, she noticed no patterns in the geographic distributions of the deaths after comparisons with local maps of interest. This supported her hypothesis, so she took samples of the honey and the bees from the hives and performed dozens of dissections to confirm her suspicions. Which of the following is the most likely hypothesis upon which this research was performed?
- A. Honeybees are being killed off, and their hives are destroyed by other extremely aggressive species of bees from the South.
- B. Honeybees are contracting parasites in large droves.
- C. Honeybees are so sensitive to certain pesticides that they die on contact.
- D. Honeybees die in larger numbers around cell phone towers.
Correct answer: B
Rationale: The most likely hypothesis based on the information provided is that honeybees are contracting parasites in large droves. Anya observed no geographic patterns in hive deaths and proceeded to analyze honey and bees for further investigation. This suggests that she suspected a widespread issue affecting multiple hives simultaneously, consistent with a scenario where honeybees are being infected by parasites in high numbers, leading to dwindling populations across different locations. The other choices can be eliminated because there is no mention of aggressive species of bees from the South, no evidence pointing to pesticide sensitivity as the cause, and no indication of a correlation with cell phone towers in the information provided.
2. Which valve prevents the return of blood into the right ventricle?
- A. Pulmonary semilunar valve
- B. Aortic semilunar valve
- C. Tricuspid valve
- D. Mitral valve
Correct answer: A
Rationale: The correct answer is A: Pulmonary semilunar valve. The pulmonary semilunar valve is located between the right ventricle and the pulmonary artery. It opens to allow blood to be pumped into the pulmonary artery but closes to prevent blood from returning back into the right ventricle. The aortic semilunar valve is located between the left ventricle and the aorta. The tricuspid valve is located between the right atrium and right ventricle, and the mitral valve is located between the left atrium and left ventricle. Therefore, the pulmonary semilunar valve is the specific valve responsible for preventing the backflow of blood into the right ventricle during the cardiac cycle.
3. What do ligaments connect?
- A. Muscle to muscle
- B. Bone to bone
- C. Bone to muscle
- D. Muscle to tendon
Correct answer: B
Rationale: Ligaments are fibrous connective tissues that connect bone to bone, providing stability and support to joints. They help prevent excessive movement in the joints and maintain proper alignment between bones during movement. Ligaments are not directly involved in connecting muscle to muscle, bone to muscle, or muscle to tendon. Choice A is incorrect because ligaments do not connect muscle to muscle. Choice C is incorrect as ligaments do not connect bone to muscle. Choice D is incorrect as ligaments do not connect muscle to tendon.
4. Which type of tissue provides support and structure to the body?
- A. Muscle tissue
- B. Connective tissue
- C. Nervous tissue
- D. Epithelial tissue
Correct answer: B
Rationale: Connective tissue is the correct answer as it provides support, structure, and strength to the body by holding tissues and organs in place. Muscle tissue is primarily responsible for movement, nervous tissue for communication, and epithelial tissue for covering and lining surfaces. While muscle tissue allows for voluntary and involuntary movement, nervous tissue transmits electrical signals, and epithelial tissue acts as a protective barrier and is involved in absorption and secretion. Therefore, in the context of providing support and structure, connective tissue is the most appropriate choice.
5. What is the small repeating unit in the contractile apparatus of skeletal muscle?
- A. Myofibril
- B. Actin
- C. Sarcomere
- D. Myosin
Correct answer: C
Rationale: The correct answer is 'Sarcomere.' The sarcomere is the smallest repeating unit within myofibrils and is responsible for muscle contraction in skeletal muscle. It consists of overlapping actin and myosin filaments arranged in a highly organized structure that allows for the sliding of filaments during muscle contraction. 'Myofibril' (choice A) is incorrect because it is a larger structure composed of sarcomeres. 'Actin' (choice B) and 'Myosin' (choice D) are incorrect as they are individual proteins that are components of the sarcomere, not the smallest repeating unit itself.
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