TEAS 7 science practice questions

TEAS 7 science practice questions Related

Review TEAS 7 science practice questions related questions and content

Homologous structures are those that:

  • A. Have the same function but different origins
  • B. Have different functions but the same origin
  • C. Are similar in appearance and function due to shared ancestry
  • D. Are identical in both appearance and function
Correct Answer: C

Rationale: Homologous structures are defined as anatomical features that are similar in appearance and function due to shared ancestry. This means that these structures are inherited from a common ancestor and may have evolved to fulfill different functions in different species. Option A, which mentions structures with the same function but different origins, describes analogous structures, not homologous ones. Option B, which refers to structures with different functions but the same origin, actually characterizes vestigial structures. Option D, stating that structures are identical in appearance and function, does not necessarily imply homology; such structures could result from convergent evolution rather than shared ancestry. Understanding homologous structures provides insights into the evolutionary relationships between different species and supports the concept of common descent.

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Which statement accurately describes the electron cloud model of the atom?

  • A. Electrons precisely orbit the nucleus in defined paths.
  • B. Electrons occupy specific energy levels around the nucleus with varying probabilities.
  • C. Electrons are clustered tightly within the nucleus.
  • D. Electrons move randomly throughout the entire atom.
Correct Answer: B

Rationale: The electron cloud model of the atom describes electrons as occupying specific energy levels around the nucleus with varying probabilities. This model does not suggest that electrons precisely orbit in defined paths as stated in option A. It acknowledges the wave-like behavior of electrons and their uncertainty in position, which is not accounted for in options C and D. Option C is incorrect as electrons are not clustered tightly within the nucleus but exist in the space surrounding the nucleus. Option D is incorrect as electrons do not move randomly throughout the entire atom but have specific probabilities of being found in different regions based on their energy levels. Therefore, option B is the most accurate description of the electron cloud model of the atom.

What is the largest lymphatic vessel in the body responsible for draining lymph from most of the body called?

  • A. Jugular vein
  • B. Thoracic duct
  • C. Subclavian vein
  • D. Aorta
Correct Answer: B

Rationale: The correct answer is B: Thoracic duct. The thoracic duct is the largest lymphatic vessel in the body and is responsible for draining lymph from most of the body. The jugular vein, subclavian vein, and aorta are not lymphatic vessels responsible for draining lymph. The jugular vein and subclavian vein are blood vessels, while the aorta is the main artery that carries oxygenated blood from the heart. Understanding the role and anatomy of the lymphatic system is crucial for comprehending the body's immune response and fluid balance.

A large geographic area characterized by similar climate, plants, and animals is called a:

  • A. Population
  • B. Community
  • C. Biome
  • D. Ecosystem
Correct Answer: C

Rationale: A) Population refers to a group of individuals of the same species living in a specific area.
B) Community refers to all the populations of different species living and interacting in a particular area.
C) Biome is a large geographic area characterized by similar climate, plants, and animals. Biomes are defined by factors such as temperature, precipitation, and vegetation types.
D) Ecosystem refers to a community of living organisms interacting with each other and their physical environment. An ecosystem can be part of a biome.

How many amino acids can make up a protein?

  • A. 10-20
  • B. 50-100
  • C. 100-500
  • D. 1000+
Correct Answer: A

Rationale: Proteins are made up of long chains of amino acids, and there are 20 standard amino acids commonly found in proteins. The sequence and arrangement of these amino acids determine the structure and function of a protein. While proteins can vary in size and complexity, the number of amino acids typically ranges from around 10 to 20 in smaller proteins to hundreds or even thousands in larger proteins. Therefore, the range of 10-20 amino acids is the most accurate representation of the number of amino acids that can make up a protein. Choices B, C, and D are incorrect as they provide ranges that are beyond the typical number of amino acids found in proteins and may lead to confusion. The correct answer is A (10-20).

Which structure in the respiratory system is responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream?

  • A. Trachea
  • B. Bronchi
  • C. Alveoli
  • D. Bronchioles
Correct Answer: C

Rationale: The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs. Oxygen from the air diffuses into the bloodstream through the alveoli, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled. The trachea, bronchi, and bronchioles are essential parts of the airway system responsible for transporting air to and from the lungs but do not directly participate in the gas exchange process. Therefore, option C, the alveoli, is the correct answer for the structure responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream.

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