TEAS 7 practice test free science

TEAS 7 practice test free science Related

Review TEAS 7 practice test free science related questions and content

How does an increase in temperature generally affect the solubility of most solid solutes in a liquid solvent?

  • A. It increases solubility
  • B. It decreases solubility
  • C. It has no effect on solubility
  • D. It depends on the nature of the solute
Correct Answer: A

Rationale: In general, increasing temperature tends to increase the solubility of most solid solutes in liquid solvents. This occurs because higher temperatures provide more energy for the solvent molecules to break the solute-solvent attractive forces and allow more solute to dissolve. The increase in temperature facilitates the dissolution process by overcoming the intermolecular forces that hold the solute particles together. Choice B is incorrect because higher temperatures typically lead to greater solubility. Choice C is incorrect as temperature changes usually impact solubility. Choice D is incorrect because although the nature of the solute can influence solubility, the general trend is that higher temperatures enhance solubility for most solid solutes in liquid solvents.

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Which division of the peripheral nervous system is responsible for transmitting signals from the central nervous system to skeletal muscles, enabling voluntary muscle movements?

  • A. Somatic nervous system
  • B. Autonomic nervous system
  • C. Sympathetic nervous system
  • D. Parasympathetic nervous system
Correct Answer: A

Rationale: The correct answer is the somatic nervous system. The somatic nervous system is responsible for transmitting signals from the central nervous system to skeletal muscles, allowing for voluntary muscle movements. The autonomic nervous system, sympathetic nervous system, and parasympathetic nervous system are not involved in voluntary muscle movements. Instead, they regulate involuntary functions of the body such as heart rate, digestion, and breathing. Therefore, choices B, C, and D are incorrect as they are not associated with voluntary muscle movements.

What is the name of the muscular ring that controls the passage of food from the esophagus to the stomach?

  • A. Pyloric sphincter
  • B. Cardiac sphincter
  • C. Ileocecal valve
  • D. Sphincter of Oddi
Correct Answer: B

Rationale: The correct answer is the Cardiac sphincter (lower esophageal sphincter). It is situated at the junction of the esophagus and the stomach, controlling the passage of food into the stomach. The cardiac sphincter opens and closes to regulate the flow of food and prevent reflux. The pyloric sphincter, on the other hand, is located between the stomach and the small intestine, not the esophagus and stomach. The ileocecal valve is positioned between the small and large intestines, while the Sphincter of Oddi is found in the duodenum, not between the esophagus and stomach.

What is the main function of estuaries?

  • A. Filtering pollutants from water
  • B. Providing habitat for marine life
  • C. Storing carbon dioxide
  • D. Generating wind power
Correct Answer: B

Rationale: Estuaries are coastal areas where freshwater from rivers and streams mixes with saltwater from the ocean. They serve as important habitats for a variety of marine life, including fish, birds, and other wildlife. Estuaries provide shelter, breeding grounds, and food sources for many species, making them crucial for the overall health of marine ecosystems. While estuaries can help filter pollutants to some extent, their primary function is to support and sustain diverse populations of plants and animals. Storing carbon dioxide and generating wind power are not main functions of estuaries.

What is the medical term for a urinary tract infection (UTI)?

  • A. Nephritis
  • B. Cystitis
  • C. Urethritis
  • D. All of the above
Correct Answer: B

Rationale: The medical term specifically used to refer to a urinary tract infection (UTI) that affects the bladder is cystitis. Nephritis refers to inflammation of the kidneys, and urethritis refers to inflammation of the urethra. As such, cystitis is the correct term for a UTI, making choice B the right answer. Choices A, C, and D are incorrect because they refer to different conditions affecting the urinary system.

What is the term for a substance that can act as both a proton donor and a proton acceptor?

  • A. Acid
  • B. Base
  • C. Amphiprotic
  • D. Neutral
Correct Answer: C

Rationale: Amphiprotic substances are those that can both donate and accept protons. They possess characteristics of both acids and bases, making them capable of acting as proton donors and proton acceptors. Choices A and B represent substances that are specific to either donating or accepting protons. Choice D does not describe a substance's ability to donate or accept protons since neutrality does not inherently involve proton donation or acceptance.

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