Mometrix TEAS 7 science practice test

Mometrix TEAS 7 science practice test Related

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The Hardy-Weinberg equilibrium describes a population that is:

  • A. Undergoing rapid evolution due to strong directional selection.
  • B. Not evolving and at genetic equilibrium with stable allele frequencies.
  • C. Experiencing a founder effect leading to a reduction in genetic diversity.
  • D. Dominated by a single homozygous genotype that eliminates all variation.
Correct Answer: B

Rationale: The Hardy-Weinberg equilibrium describes a theoretical population in which allele frequencies remain constant from generation to generation, indicating that the population is not evolving. This equilibrium occurs under specific conditions: no mutation, no gene flow, random mating, a large population size, and no natural selection. In this scenario, all genotypes are in proportion to the allele frequencies, and genetic diversity is maintained. Options A, C, and D do not accurately describe a population in Hardy-Weinberg equilibrium. Option A suggests rapid evolution due to strong directional selection, which would disrupt the equilibrium. Option C mentions a founder effect, which can reduce genetic diversity but is not a characteristic of a population in Hardy-Weinberg equilibrium. Option D describes a population dominated by a single homozygous genotype, which also does not align with the genetic diversity seen in a population at Hardy-Weinberg equilibrium.

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What is the milky-white fluid transported by the lymphatic vessels called?

  • A. Plasma
  • B. Blood
  • C. Chyle
  • D. Mucus
Correct Answer: C

Rationale: The milky-white fluid transported by the lymphatic vessels is called chyle. Chyle is formed in the small intestine during the digestion of fatty foods and contains a mixture of lymph and emulsified fats. Plasma is the liquid component of blood, not lymphatic fluid. Blood refers to the fluid that circulates in the cardiovascular system, not lymphatic fluid. Mucus is a slimy substance secreted by mucous membranes, not the fluid transported by lymphatic vessels.

Which of the following is a weak acid commonly found in citrus fruits?

  • A. Sulfuric acid (Hâ‚‚SOâ‚„)
  • B. Hydrochloric acid (HCl)
  • C. Citric acid
  • D. Nitric acid (HNO₃)
Correct Answer: C

Rationale: Citric acid is a weak acid commonly found in citrus fruits like lemons, oranges, and limes. It is responsible for the sour taste in these fruits. Sulfuric acid (option A), hydrochloric acid (option B), and nitric acid (option D) are all strong acids that are typically used in laboratory settings and industrial processes, not naturally found in citrus fruits. Therefore, the correct answer is option C.

What is the name of the cartilage flap that covers the trachea during swallowing, preventing food from entering the airway?

  • A. Epiglottis
  • B. Glottis
  • C. Larynx
  • D. Pharynx
Correct Answer: A

Rationale: The correct answer is A: Epiglottis. The epiglottis is a cartilage flap located at the base of the tongue that covers the trachea during swallowing. Its primary function is to prevent food and liquids from entering the airway and instead directs them towards the esophagus. The glottis (choice B) refers to the space between the vocal cords in the larynx. The larynx (choice C) is the voice box containing the vocal cords responsible for phonation. The pharynx (choice D) is the throat region connecting the mouth and the esophagus, playing a role in both digestion and respiration.

Which of the following is the smallest part of an element that can still be recognized as that element?

  • A. Electron
  • B. Proton
  • C. Neutron
  • D. Atom
Correct Answer: D

Rationale: An atom is the smallest unit of matter that retains the chemical properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons that orbit the nucleus. The number of protons in the nucleus defines the atomic number of the element, and the number of neutrons determines the isotope of the element. While electrons, protons, and neutrons are fundamental particles, an atom as a whole is the smallest part of an element that maintains its unique identity. Electrons are negatively charged particles orbiting the nucleus, protons are positively charged particles in the nucleus, and neutrons are neutral particles in the nucleus. Therefore, the correct answer is 'D: Atom.'

Which element has the highest melting point of any element?

  • A. Tungsten
  • B. Iron
  • C. Platinum
  • D. Carbon
Correct Answer: D

Rationale: Among the choices provided, carbon, in the form of diamond, has the highest melting point of any element. Diamond's strong covalent bonds between carbon atoms make it incredibly resistant to heat and pressure, giving it the highest melting point compared to tungsten, iron, and platinum. Tungsten is known for its high melting point among metals but not as high as carbon. Iron and platinum have lower melting points compared to carbon, making them incorrect choices in this context.

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