Practice Science TEAS Test

Practice Science TEAS Test Related

Review Practice Science TEAS Test related questions and content

What is the role of the diaphragm in respiration?

  • A. To regulate air pressure in the lungs
  • B. To contract and expand the lungs
  • C. To store oxygen
  • D. To break down carbon dioxide
Correct Answer: B

Rationale: The correct answer is B. The diaphragm plays a crucial role in respiration by contracting and expanding the lungs. When the diaphragm contracts, it moves downward, creating more space in the chest cavity and allowing the lungs to expand. This expansion leads to a decrease in pressure inside the lungs, causing air to rush in. When the diaphragm relaxes, it moves back up, decreasing the space in the chest cavity and causing the lungs to deflate. This action increases the pressure in the lungs, leading to air being pushed out. Therefore, the diaphragm's main function is to facilitate the inhalation and exhalation of air by contracting and expanding the lungs. Choices A, C, and D are incorrect because the diaphragm's primary function is not to regulate air pressure in the lungs, store oxygen, or break down carbon dioxide. Instead, its main purpose is to aid in the mechanical process of breathing.

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Which of the following statements regarding macrophages is incorrect?

  • A. They are found abundantly in the blood
  • B. They are larger than neutrophils
  • C. They are long-lived
  • D. They are made in the bone marrow as monocytes, called macrophages once they reach organs
Correct Answer: A

Rationale: The correct answer is A. Macrophages are not found abundantly in the blood; they are present in tissues and organs. Macrophages are tissue-resident immune cells that play a key role in immune responses and are derived from monocytes produced in the bone marrow. Choice B is correct as macrophages are larger than neutrophils. Choice C is correct as macrophages are long-lived cells. Choice D is correct as macrophages originate in the bone marrow as monocytes and differentiate into macrophages once they migrate to various tissues and organs.

What is the primary function of the kidneys?

  • A. To digest food
  • B. To filter blood and produce urine
  • C. To absorb nutrients
  • D. To transport oxygen
Correct Answer: B

Rationale: The primary function of the kidneys is to filter blood and remove waste products from the body, producing urine in the process. This function helps in maintaining the body's internal environment stable, a process known as homeostasis. Option A, 'To digest food,' is incorrect as digestion primarily occurs in the gastrointestinal system, not in the kidneys. Option C, 'To absorb nutrients,' is also incorrect because nutrient absorption mainly takes place in the intestines. Option D, 'To transport oxygen,' is incorrect as the lungs and circulatory system are responsible for oxygen transport, not the kidneys.

Which of the following statements is NOT true about DNA?

  • A. DNA contains the nucleotides A, T, C, G and is read 5' to 3'.
  • B. DNA contains genetic information and is tightly coiled with proteins to form chromosomes.
  • C. DNA contains the nucleotides A, T, C, G and is read 3' to 5'.
  • D. DNA is a double-stranded molecule connected by hydrogen bonds.
Correct Answer: C

Rationale: The correct answer is C because DNA is typically read from the 5' end to the 3' end, not from 3' to 5'. Choices A, B, and D are all true statements about DNA. DNA contains the nucleotides A, T, C, G and is read in a 5' to 3' direction. DNA also contains genetic information and is tightly coiled with proteins to form chromosomes. Additionally, DNA is a double-stranded molecule connected by hydrogen bonds.

Which part of the brain regulates body temperature, hunger, and thirst?

  • A. Cerebellum
  • B. Hypothalamus
  • C. Thalamus
  • D. Medulla oblongata
Correct Answer: B

Rationale: The correct answer is the Hypothalamus. The hypothalamus is a crucial part of the brain that regulates various essential functions to maintain homeostasis. It controls body temperature, hunger, thirst, and plays a key role in the autonomic nervous system. The cerebellum is primarily involved in coordinating movement and balance, the thalamus acts as a relay station for sensory information, and the medulla oblongata is responsible for vital functions like breathing and heart rate. Therefore, choices A, C, and D are incorrect as they do not govern the specific functions mentioned in the question.

What does cytokinesis refer to?

  • A. Division of the nucleus
  • B. Division of the cytoplasm
  • C. Separation of chromosomes
  • D. Formation of spindle fibers
Correct Answer: B

Rationale: Cytokinesis refers to the division of the cytoplasm of a parental cell between two daughter cells during cell division. It ensures that each daughter cell receives its share of organelles and cytoplasmic components necessary for cellular functions. Choice A, division of the nucleus, is incorrect as this process is known as mitosis. Choice C, separation of chromosomes, is incorrect as it refers to the process of chromatid separation during mitosis. Choice D, formation of spindle fibers, is incorrect as spindle fibers are involved in mitosis to separate chromosomes, not in cytokinesis.

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