ATI TEAS 7
TEAS 7 science practice questions
1. Homologous structures are those that:
- A. Have the same function but different origins
- B. Have different functions but the same origin
- C. Are similar in appearance and function due to shared ancestry
- D. Are identical in both appearance and function
Correct answer: C
Rationale: Homologous structures are defined as anatomical features that are similar in appearance and function due to shared ancestry. This means that these structures are inherited from a common ancestor and may have evolved to fulfill different functions in different species. Option A, which mentions structures with the same function but different origins, describes analogous structures, not homologous ones. Option B, which refers to structures with different functions but the same origin, actually characterizes vestigial structures. Option D, stating that structures are identical in appearance and function, does not necessarily imply homology; such structures could result from convergent evolution rather than shared ancestry. Understanding homologous structures provides insights into the evolutionary relationships between different species and supports the concept of common descent.
2. What is the formula to calculate acceleration?
- A. Acceleration = Mass/Force
- B. Acceleration = Force/Mass
- C. Acceleration = Time/Distance
- D. Acceleration = Time Change in Velocity
Correct answer: D
Rationale: Acceleration is defined as the rate of change of velocity with respect to time. The correct formula to calculate acceleration is Acceleration = Time Change in Velocity. This formula specifically represents how much an object's velocity changes over a specified time period, providing a measure of the object's speed change rate. Choices A and B are incorrect as they do not represent the relationship between acceleration and time change in velocity. Choice C is incorrect as it involves time and distance, which are not directly related to acceleration.
3. Dietary fiber, although not fully digested by the body, plays a crucial role in digestion. What is one of the main benefits of consuming sufficient dietary fiber?
- A. Provides a concentrated source of energy
- B. Aids in the absorption of vitamins and minerals
- C. Promotes satiety and gut health
- D. Breaks down complex carbohydrates
Correct answer: C
Rationale: Consuming sufficient dietary fiber promotes satiety and gut health by adding bulk to the diet, helping with feelings of fullness, and supporting healthy digestion. Additionally, fiber aids in regulating bowel movements and maintaining a healthy gut microbiota, contributing to overall digestive wellness. It does not provide a concentrated source of energy as fiber is not fully digested for energy production, nor does it directly aid in the absorption of vitamins and minerals. Fiber does not break down complex carbohydrates but rather assists in their digestion and absorption by slowing down the process, which helps in maintaining stable blood sugar levels and promoting better overall health.
4. Which organ produces insulin, a hormone responsible for regulating blood sugar levels?
- A. Parathyroid gland
- B. Pancreas
- C. Thymus gland
- D. Ovaries
Correct answer: B
Rationale: Insulin is a hormone produced by the pancreas. Beta cells located in the islets of Langerhans within the pancreas are responsible for insulin production. Insulin plays a crucial role in regulating blood sugar levels by promoting the uptake of glucose into cells, thereby maintaining blood sugar levels within a normal range. Choices A, C, and D are incorrect because the parathyroid gland is primarily involved in regulating calcium levels, the thymus gland is involved in immune function, and the ovaries are involved in reproductive functions, not insulin production for blood sugar regulation.
5. What is the term for a group of organisms with the same genetic makeup?
- A. Population
- B. Clone
- C. Genotype
- D. Species
Correct answer: B
Rationale: In this context, a clone (option B) is a group of organisms that are genetically identical because they are derived from a single ancestor. A population (option A) refers to a group of individuals of the same species living in the same area. Genotype (option C) refers to the genetic makeup of an individual organism. Species (option D) refers to a group of organisms that can interbreed and produce fertile offspring. Therefore, the most appropriate choice for the question is 'Clone,' as it specifically refers to organisms with the same genetic makeup.
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