TEAS 7 practice test science

TEAS 7 practice test science Related

Review TEAS 7 practice test science related questions and content

Which of these pairs represents an example of convergent evolution?

  • A. Humans and chimpanzees
  • B. Bats and birds
  • C. Dolphins and sharks
  • D. Snakes and earthworms
Correct Answer: B

Rationale: Convergent evolution refers to the process by which different species independently evolve similar traits or characteristics due to similar environmental pressures. In the case of bats and birds, both have evolved wings for flight despite not sharing a recent common ancestor with wings. Bats are mammals, while birds are avians, yet they both have wings adapted for flight, which is a classic example of convergent evolution.

A) Humans and chimpanzees share a common ancestor and have not independently evolved similar traits.
C) Dolphins and sharks are not closely related, and their similarities are due to adaptations to their aquatic environment rather than convergent evolution.
D) Snakes and earthworms belong to different classes (reptiles and annelids, respectively) and do not share recent common ancestors, making their similarities not a result of convergent evolution.

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A symbiotic relationship where one organism benefits and the other is not harmed is called:

  • A. Mutualism
  • B. Commensalism
  • C. Parasitism
  • D. Predation
Correct Answer: B

Rationale: B) Commensalism: In commensalism, one organism benefits while the other is neither helped nor harmed. This is the relationship described in the question. The correct answer is Commensalism because it specifically fits the scenario where one organism benefits without affecting the other. A) Mutualism: In mutualism, both organisms involved benefit from the relationship. C) Parasitism: In parasitism, one organism benefits at the expense of the other organism, which is harmed. D) Predation: In predation, one organism (predator) kills and consumes another organism (prey) for food.

What is the name of the wart-like growths caused by the human papillomavirus (HPV)?

  • A. Keloids
  • B. Keloids
  • C. Papillomas
  • D. Carcinomas
Correct Answer: C

Rationale: The correct answer is 'Papillomas.' Papillomas are benign wart-like growths caused by the human papillomavirus (HPV). Keloids are raised scars that occur at the site of an injury due to excessive collagen formation, while carcinomas are malignant tumors arising from epithelial cells. When identifying the growths specifically related to HPV, papillomas are the most appropriate term.

What is the main target organ for insulin, the hormone produced by the pancreas?

  • A. Liver
  • B. Kidneys
  • C. Muscles
  • D. Brain
Correct Answer: C

Rationale: The main target organ for insulin is muscles. Insulin plays a crucial role in regulating glucose metabolism by promoting the uptake of glucose into muscle cells. This glucose can then be utilized for energy production or stored for later use. Therefore, muscles are the primary site where insulin exerts its effects on glucose uptake and utilization. The liver primarily responds to insulin by regulating glucose storage and release, but the main target for insulin-mediated glucose uptake is muscles. Kidneys are not a target organ for insulin action in glucose metabolism. The brain does not heavily rely on insulin for glucose uptake as it primarily uses glucose independently of insulin for energy production.

Which structure connects the two hemispheres of the brain, allowing communication and coordination between them?

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

Rationale: The correct answer is the corpus callosum. It is a thick band of nerve fibers that connects the two hemispheres of the brain, facilitating communication and coordination between them. The thalamus acts as a relay station for sensory information, the hypothalamus regulates basic functions like hunger and thirst, and the medulla oblongata controls vital functions such as breathing and heart rate. Therefore, choices B, C, and D are incorrect as they do not specifically connect the two hemispheres of the brain as the corpus callosum does.

What happens when an atom loses an electron?

  • A. It forms a molecule.
  • B. It gains a positive charge and becomes an ion.
  • C. It alters its elemental identity.
  • D. No change occurs; it remains neutral.
Correct Answer: B

Rationale: When an atom loses an electron, it gains a positive charge and becomes an ion. This occurs because the number of protons in the atom exceeds the number of electrons, leading to a positive charge. Therefore, the atom undergoes a transformation into an ion by losing an electron. Choice A is incorrect because losing an electron does not result in the formation of a molecule, as molecules are made up of bonded atoms. Choice C is incorrect because losing an electron does not change the fundamental identity of the atom; it only changes its charge. Choice D is incorrect because losing an electron causes the atom to become positively charged, altering its neutrality.

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