which of the following best describes one of the roles of rna

ATI TEAS 7

ATI TEAS 7 Science Practice Test

1. Which of the following best describes one of the roles of RNA?

A. Manufacturing the proteins needed from DNA
B. Creating the bonds between the elements that make up DNA
C. Sending messages about the correct sequence of proteins in DNA
D. Forming the identifiable double helix shape of DNA

Correct answer: C

Rationale: The correct answer is C. RNA serves as a messenger that carries instructions from DNA for protein synthesis. It does not manufacture proteins directly from DNA (choice A), create bonds within DNA (choice B), or form the double helix structure of DNA (choice D). Therefore, the primary role of RNA is to convey information about the correct sequence of proteins to be synthesized based on the DNA sequences it receives.

2. Muscle tissue is responsible for movement. Which type of muscle tissue is found in the heart?

A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. All of the above

Correct answer: C

Rationale: Cardiac muscle is the type of muscle tissue found in the heart. Unlike skeletal muscle and smooth muscle, cardiac muscle is striated and involuntary, meaning it contracts without conscious control. It forms the majority of the heart's structure and is essential for its rhythmic contraction to pump blood throughout the body. Skeletal muscle is attached to bones and responsible for voluntary movements, while smooth muscle is found in organs and blood vessels, controlling various involuntary functions like digestion and blood flow. Therefore, choices A (Skeletal muscle) and B (Smooth muscle) are incorrect as they are not the types of muscle tissue found in the heart.

3. Differentiate between epithelial and connective tissue.

A. Epithelial tissue lines surfaces and glands, while connective tissue supports tendons.
B. Both are composed of cells, but epithelial tissue lines surfaces and glands, while connective tissue binds other tissues.
C. Epithelial tissue covers surfaces and connective tissue supports muscle contraction.
D. Epithelial tissue is the largest tissue type, while connective tissue is the smallest.

Correct answer: B

Rationale: Epithelial tissue covers surfaces and lines organs, while connective tissue provides support and structure throughout the body. Both are composed of cells, but their functions and locations differ. Epithelial tissue acts as a barrier to protect underlying tissues and organs, while connective tissue connects, supports, and separates different types of tissues and organs in the body. Choice A is incorrect as connective tissue supports and binds other tissues, not just tendons. Choice C is incorrect because connective tissue does not support muscle contraction; it provides support to various structures in the body. Choice D is incorrect as the size of a tissue type does not define its function; epithelial tissue and connective tissue serve different purposes in the body.

4. Which of the following is NOT a greenhouse gas?

A. Carbon Dioxide
B. Methane
C. Oxygen
D. Water Vapor

Correct answer: C

Rationale: A) Carbon Dioxide: Carbon dioxide is a greenhouse gas released into the atmosphere through various human activities such as burning fossil fuels and deforestation. It contributes to global warming by trapping heat in the atmosphere. B) Methane: Methane is another greenhouse gas released from sources like livestock, landfills, and natural gas production. It is more potent than carbon dioxide in trapping heat. C) Oxygen: Oxygen is not considered a greenhouse gas. It is a vital component of the Earth's atmosphere necessary for respiration and combustion, but it does not trap heat like greenhouse gases do. D) Water Vapor: Water vapor is a significant greenhouse gas that plays a crucial role in the Earth's climate system by trapping heat in the atmosphere. It is the most abundant greenhouse gas. Therefore, the correct answer is C) Oxygen, as it is not a greenhouse gas.

5. What is the formula to calculate work?

A. Work = Force × Distance
B. Work = Mass × Velocity
C. Work = Power × Time
D. Work = Energy ÷ Time

Correct answer: A

Rationale: Work is defined as the product of the force applied to an object and the distance over which the force is applied. The formula to calculate work is represented by Work = Force × Distance, where force is the applied force on an object and distance is the displacement over which the force is applied. Therefore, the correct formula to calculate work is Work = Force × Distance. Choice B, 'Work = Mass × Velocity,' is incorrect because work involves force and distance, not mass and velocity. Choice C, 'Work = Power × Time,' is incorrect because work is not directly calculated using power and time. Choice D, 'Work = Energy ÷ Time,' is incorrect because work is not typically calculated by dividing energy by time; rather, it involves the product of force and distance.