ATI TEAS 7 Science Practice Test

ATI TEAS 7 Science Practice Test Related

Review ATI TEAS 7 Science Practice Test related questions and content

Which of the following body systems controls fluid loss, protects deep tissues, and synthesizes vitamin D?

  • A. The skeletal system
  • B. The muscular system
  • C. The lymphatic system
  • D. The integumentary system
Correct Answer: D

Rationale: The integumentary system is responsible for controlling fluid loss through sweat, protecting deep tissues as the body's first line of defense, and synthesizing vitamin D when exposed to sunlight. The skin, hair, nails, and associated glands make up the integumentary system, which plays a crucial role in maintaining homeostasis and overall health. The skeletal system (Choice A) provides structural support and protection for internal organs but does not directly control fluid loss, protect deep tissues, or synthesize vitamin D. The muscular system (Choice B) is responsible for movement and stability but is not involved in the functions described. The lymphatic system (Choice C) is primarily responsible for immunity and fluid balance, not the specific functions mentioned in the question.

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Which of the following quantities do catalysts alter to control the rate of a chemical reaction?

  • A. Substrate energy
  • B. Activation energy
  • C. Inhibitor energy
  • D. Promoter energy
Correct Answer: B

Rationale: The correct answer is B: Activation energy. Catalysts function by reducing the activation energy needed for a chemical reaction to proceed. By lowering the activation energy, catalysts facilitate the reaction without being consumed themselves. Substrate energy, inhibitors, and promoters are not directly altered by catalysts in the same way activation energy is. Substrate energy refers to the energy of the reactants, which is not altered by catalysts. Inhibitors increase the activation energy required for a reaction, while promoters enhance the effectiveness of a catalyst but do not represent a quantity altered by catalysts.

What type of molecules are enzymes?

  • A. Water molecules
  • B. Protein molecules
  • C. Tripolar molecules
  • D. Inorganic molecules
Correct Answer: B

Rationale: The correct answer is B: Protein molecules. Enzymes are biological catalysts made up of proteins. They function by facilitating and speeding up chemical reactions in living organisms. Therefore, enzymes are primarily composed of protein molecules, not water, tripolar, or inorganic molecules. Choice A (Water molecules), Choice C (Tripolar molecules), and Choice D (Inorganic molecules) are incorrect because enzymes are specifically classified as proteins due to their structure and function in biological systems.

An atom has 2 protons, 4 neutrons, and 2 electrons. What is the approximate atomic mass of this atom?

  • A. 2
  • B. 4
  • C. 6
  • D. 8
Correct Answer: D

Rationale: The atomic mass of an atom is the sum of the protons and neutrons in its nucleus. In this case, the atom has 2 protons and 4 neutrons, totaling 6 particles in the nucleus. Therefore, the approximate atomic mass of this atom is 6, making choice C incorrect. The number of electrons does not significantly contribute to the atomic mass, as they are much lighter and located in the electron cloud surrounding the nucleus. Choices A, B, and C are incorrect as they do not reflect the correct calculation of atomic mass based on protons and neutrons only.

A substance is only considered acidic if it has a pH less than what?

  • A. 12
  • B. 9
  • C. 7
  • D. 4
Correct Answer: C

Rationale: A substance is considered acidic if its pH is less than 7. pH values below 7 indicate acidity, while pH values above 7 indicate alkalinity or basicity. Substances with a pH less than 7 are categorized as acidic, not above it. Therefore, a substance is classified as acidic if its pH is less than 7, making choice C the correct answer. Choices A, B, and D are incorrect because a pH of 12, 9, and 4, respectively, are all above 7, and therefore not indicative of acidity.

Which of the following statements describes a chemical property of water?

  • A. Water has a pH of 1.
  • B. A water molecule contains 2 hydrogen atoms and 1 oxygen atom.
  • C. A water molecule contains 2 oxygen atoms and 1 hydrogen atom.
  • D. The chemical formula for water is HO.
Correct Answer: B

Rationale: The correct answer is B because a water molecule consists of two hydrogen atoms and one oxygen atom, which is a fundamental chemical property of water. The pH of water is not a property of the water molecule itself but rather a measure of its acidity or alkalinity. Choice C is incorrect as it describes a different molecule, not water. Choice D provides an incorrect chemical formula for water, which is H2O.

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