TEAS 7 science study guide free

TEAS 7 science study guide free Related

Review TEAS 7 science study guide free related questions and content

Which type of tissue is characterized by tightly packed cells with minimal extracellular matrix and provides structural support and protection?

  • A. Epithelial tissue
  • B. Connective tissue
  • C. Muscle tissue
  • D. Nervous tissue
Correct Answer: A

Rationale: Epithelial tissue is the correct answer as it aligns with the description provided in the question. Epithelial tissue is characterized by tightly packed cells with minimal extracellular matrix, which allows it to form protective barriers on the body's surface and line internal organs, providing structural support and protection. Connective tissue, while important for support and connection between tissues and organs, does not fit the description in the question of being tightly packed with minimal extracellular matrix. Muscle tissue is responsible for movement, and nervous tissue transmits signals throughout the body, neither of which are primarily involved in providing structural support and protection as described. Therefore, based on the characteristics described in the question, epithelial tissue best fits the description of tissue that provides structural support and protection.

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In nuclear physics, the term 'barn' is a unit commonly used to quantify:

  • A. Energy
  • B. Radioactivity
  • C. Nuclear cross-section
  • D. Half-life
Correct Answer: C

Rationale: In nuclear physics, the term 'barn' is a unit used to quantify nuclear cross-section. Nuclear cross-section is a measure of the probability of a nuclear reaction occurring when an atomic nucleus interacts with a particle or another nucleus. The barn is a unit of area equal to 10^-28 square meters; it is commonly used to describe the cross-sectional area of atomic nuclei for nuclear reactions. Choice A, 'Energy,' is incorrect because a barn is not a unit for measuring energy; it is a unit of area. Choice B, 'Radioactivity,' is incorrect as radioactivity is typically measured in units like becquerels. Choice D, 'Half-life,' is also incorrect as half-life is a measure of the time it takes for half of a substance to decay, not related to the concept of a barn as a unit of nuclear cross-section.

Which hormone plays a key role in stimulating the release of milk from breast tissue after childbirth?

  • A. Follicle-stimulating hormone (FSH)
  • B. Luteinizing hormone (LH)
  • C. Prolactin
  • D. Estrogen
Correct Answer: C

Rationale: Prolactin is the hormone responsible for stimulating the release of milk from breast tissue after childbirth. It is produced by the pituitary gland and plays a crucial role in lactation. Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are involved in the menstrual cycle and reproductive processes, not milk production. Estrogen is a female sex hormone with various functions but is not directly involved in milk production.

How does RNA polymerase differ from DNA polymerase?

  • A. Both enzymes are identical in function and structure.
  • B. RNA polymerase does not require a primer to initiate RNA synthesis.
  • C. RNA polymerase can synthesize both RNA and DNA.
  • D. RNA polymerase can only synthesize RNA, unlike DNA polymerase.
Correct Answer: B

Rationale: Rationale:
A) This statement is incorrect. RNA polymerase and DNA polymerase are not identical in function and structure. They have different roles in the cell.
B) This statement is correct. Unlike DNA polymerase, RNA polymerase does not require a primer to initiate RNA synthesis. RNA polymerase can start the synthesis of RNA de novo.
C) This statement is incorrect. RNA polymerase is specialized for synthesizing RNA, not DNA. DNA polymerase is responsible for synthesizing DNA.
D) This statement is correct. RNA polymerase can only synthesize RNA, while DNA polymerase is responsible for synthesizing DNA.

Which type of nutrient requires the most complex and lengthy digestion process?

  • A. Carbohydrates
  • B. Proteins
  • C. Fats
  • D. Vitamins
Correct Answer: B

Rationale: Proteins require the most complex and lengthy digestion process compared to the other nutrient types provided. When proteins are consumed, they undergo a process where they need to be broken down into amino acids, which are essential building blocks of proteins. This intricate digestion process begins in the stomach aided by stomach acid and enzymes, proceeds to the small intestine where further enzymes break down proteins into amino acids, and concludes with the absorption of these amino acids into the bloodstream for various bodily functions. Carbohydrates and fats also require digestion, but the process for breaking down proteins into amino acids is notably more intricate and time-consuming. In contrast, vitamins do not require digestion in the same manner as proteins, carbohydrates, and fats because they are already in a form that can be readily absorbed by the body.

How is work defined in terms of force and displacement?

  • A. Work is the product of force and displacement in any direction
  • B. Work is done only when the displacement is vertical
  • C. Work is done only when the force and displacement are perpendicular
  • D. Work is the product of force and displacement in the direction of the force
Correct Answer: D

Rationale: Work is defined as the product of the force applied on an object and the displacement of the object in the direction of the force. This means that work is only done when the force and displacement are in the same direction. If the force and displacement are not in the same direction, only the component of the force in the direction of the displacement contributes to the work done. Therefore, choice D correctly defines work in terms of force and displacement. Choices A, B, and C are incorrect because work is specifically calculated based on the force and displacement in the direction of the force, not in any direction, only when the displacement is vertical, or when the force and displacement are perpendicular.

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