the gut microbiome refers to the community of microorganisms living in the digestive tract what is the significance of a healthy gut microbiome
Logo

Nursing Elites

ATI TEAS 7

TEAS 7 science practice

1. What is the significance of a healthy gut microbiome?

Correct answer: B

Rationale: A healthy gut microbiome plays a crucial role in boosting the immune system by defending against harmful pathogens, synthesizing essential nutrients like vitamins, aiding in the digestion of certain foods, and maintaining overall gut health. While the gut microbiome does contribute to the breakdown of complex carbohydrates and regulation of appetite, its significance extends beyond these functions to include immune support and nutrient synthesis. Choice A, production of digestive enzymes, is not the primary significance of a healthy gut microbiome. Choice C is a function related to the gut microbiome but is not the sole significance. Choice D, regulation of appetite, is important but not as central as the immune system support and nutrient synthesis provided by a healthy gut microbiome.

2. Which element is used in fluorescent lamps and emits ultraviolet light when excited?

Correct answer: A

Rationale: Mercury is the correct element used in fluorescent lamps to emit ultraviolet light when excited. When an electric current passes through the mercury vapor inside the lamp, it generates ultraviolet (UV) light. This UV light then excites the phosphors coated on the inner surface of the lamp, causing them to emit visible light. Neon, argon, and krypton are not commonly used in fluorescent lamps for this purpose. Neon is primarily used in neon signs, argon is used in incandescent and fluorescent bulbs for inertia gas, and krypton is mainly used in certain types of specialized light bulbs for its specific properties.

3. In a covalent bond, the shared electrons:

Correct answer: B

Rationale: In a covalent bond, the shared electrons spend more time closer to the more electronegative atom. Electronegativity is the ability of an atom to attract electrons in a chemical bond. The more electronegative atom exerts a stronger pull on the shared electrons, causing them to be closer to that atom. Choice A is incorrect because in a covalent bond, electrons are shared, not completely transferred. Choice C is incorrect as the shared electrons are not equidistant but are closer to one atom due to electronegativity differences. Choice D is incorrect because shared electrons play a significant role in determining the bond strength by the strength of the bond formed through electron sharing.

4. Which type of cells make up the myelin sheaths?

Correct answer: A

Rationale: The correct answer is A: Glial cells. Glial cells are responsible for producing the myelin sheaths that surround and insulate nerve cells in the central and peripheral nervous systems. Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system are types of glial cells that form the myelin sheaths. Choice B, dendrites, are not involved in forming myelin sheaths; they are extensions of neurons that receive signals. Choice C, melanocytes, are cells responsible for producing melanin, not myelin. Choice D, squamous cells, are flat epithelial cells found in various tissues but are not involved in myelin sheath formation.

5. What is the outermost layer of the dermis, rich in collagen and elastin fibers that provide elasticity to the skin?

Correct answer: B

Rationale: The correct answer is the reticular layer. This layer is the outermost layer of the dermis that contains abundant collagen and elastin fibers, providing elasticity to the skin. The papillary layer is located beneath the epidermis and is responsible for supplying nutrients to the epidermis, not the outermost layer. The stratum basale is the deepest layer of the epidermis where new skin cells are produced, not part of the dermis. The stratum corneum is the outermost layer of the epidermis composed of dead skin cells, not a layer of the dermis.

Similar Questions

Which of the following organelles is responsible for producing ATP in the cell?
Which hormone, produced by the thyroid gland, plays a key role in regulating calcium levels in the blood by promoting calcium release from bones and increasing calcium reabsorption in the kidneys?
Why is maintaining good muscle strength and flexibility as we age important?
Which organelle is responsible for packaging and secreting proteins into the extracellular space?
What is the protective sac surrounding the testes in the male reproductive system?

Access More Features

ATI TEAS Premium Plus
$149.99/ 90 days

  • Actual ATI TEAS 7 Questions
  • 3,000 questions with answers
  • 90 days access

ATI TEAS Basic
$49/ 30 days

  • 3,000 Questions with answers
  • 30 days access

Other Courses