TEAS 7 practice test science

TEAS 7 practice test science Related

Review TEAS 7 practice test science related questions and content

What type of inheritance pattern results in a 3:1 ratio of dominant to recessive phenotypes in the F2 generation?

  • A. Incomplete dominance
  • B. Codominance
  • C. Sex-linked inheritance
  • D. Autosomal dominant inheritance
Correct Answer: D

Rationale: Autosomal dominant inheritance results in a 3:1 ratio of dominant to recessive phenotypes in the F2 generation. This inheritance pattern occurs when a single copy of the dominant allele is enough to express the dominant phenotype.

A) Incomplete dominance: In incomplete dominance, the heterozygous phenotype is a blend of the two homozygous phenotypes, and it does not lead to a 3:1 ratio of dominant to recessive phenotypes in the F2 generation.

B) Codominance: In codominance, both alleles are fully expressed in the heterozygous phenotype, but this pattern also does not result in a 3:1 ratio of dominant to recessive phenotypes in the F2 generation.

C) Sex-linked inheritance: Sex-linked inheritance involves genes located on the sex chromosomes and does not typically lead to a 3:1 ratio of dominant to recessive phenotypes in the F2 generation.

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Which of the following is NOT a function of the muscular system?

  • A. Movement
  • B. Maintaining posture
  • C. Generating heat
  • D. Regulating blood sugar levels
Correct Answer: D

Rationale: The muscular system is responsible for movement, maintaining posture, and generating heat. Regulating blood sugar levels is not a function of the muscular system. This function is primarily carried out by the endocrine system, specifically the pancreas and its production of insulin and glucagon. Choices A, B, and C are all correct functions of the muscular system as they involve the contraction and relaxation of muscles to produce movement, support the body's structure, and generate heat as a byproduct of muscle activity.

What is the process of converting simple sugars into complex carbohydrates called?

  • A. Glycolysis
  • B. Gluconeogenesis
  • C. Krebs cycle
  • D. Oxidative phosphorylation
Correct Answer: B

Rationale: Gluconeogenesis is the correct answer. It is the process of synthesizing glucose from non-carbohydrate sources, such as amino acids or glycerol. A) Glycolysis is the process of breaking down glucose into pyruvate to produce energy. C) The Krebs cycle, also known as the citric acid cycle, generates energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. D) Oxidative phosphorylation is the final stage of cellular respiration where ATP is produced using energy derived from the electron transport chain. Therefore, choices A, C, and D are not the processes involved in converting simple sugars into complex carbohydrates.

What is the balanced chemical equation for the reaction between sodium and chlorine to form sodium chloride?

  • A. Na + Cl2 -> NaCl
  • B. 2Na + Cl2 -> 2NaCl
  • C. Na2 + Cl -> 2NaCl
  • D. Na + 2Cl -> NaCl2
Correct Answer: B

Rationale: In a balanced chemical equation, the number of atoms of each element must be the same on both sides of the equation. When sodium (Na) reacts with chlorine (Cl2) to form sodium chloride (NaCl), we need to ensure the equation is balanced. There are 2 chlorine atoms in Cl2; hence, we need 2 sodium atoms on the left side to balance it. Therefore, the balanced chemical equation is 2Na + Cl2 -> 2NaCl. Choice A is incorrect because it does not have the correct coefficients to balance the equation. Choice C is incorrect as it incorrectly represents the formula of sodium. Choice D is incorrect as it forms NaCl2, which is not the correct compound formed in this reaction.

Which radioactive isotope is commonly used in medical imaging techniques such as PET scans?

  • A. Uranium-235
  • B. Plutonium-239
  • C. Potassium-40
  • D. Fluorine-18
Correct Answer: D

Rationale: Fluorine-18 is the radioactive isotope commonly used in medical imaging techniques such as PET scans. It is frequently used in the form of fluorodeoxyglucose (FDG) to locate areas of heightened metabolic activity in the body, such as in cancer cells. Uranium-235 and Plutonium-239 are not typically employed in medical imaging, and Potassium-40, while a naturally occurring radioactive isotope found in the human body, is not commonly used in medical imaging techniques.

What is the term for a group of organisms living in the same place and interacting with each other?

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

Rationale: - A) Ecosystem refers to a biological community of interacting organisms and their physical environment.
- B) Community specifically refers to a group of organisms of different species living in the same place and interacting with each other.
- C) Population refers to a group of individuals of the same species living in the same area.
- D) Niche refers to the role or function of an organism or species within an ecosystem.

In this context, the term for a group of organisms living in the same place and interacting with each other is best described as a community because it involves multiple species interacting within a shared habitat.

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