Actual ATI TEAS 7 Test Questions Set 3

Science

Question 1.

The mitochondrial inner membrane carries out the same functions in cellular respiration as the ........... membrane of chloroplasts in photosynthesis. Which of the following correctly completes the sentence above?

  • A: Epithelial
  • B: Nuclear
  • C: Thylakoid
  • D: Tonoplast
  • Correct Answer: C

  • Rationale: The correct answer is C - Thylakoid. The inner membrane of mitochondria is where cellular respiration occurs, just as the thylakoid membrane in chloroplasts is where photosynthesis takes place. These membranes are essential for energy production in their respective processes.

Question 2:

What is the reason why chloride ions have a negative charge?

  • A: It lost a proton.
  • B: It gained a proton.
  • C: It gained an electron.
  • D: It lost an electron.
  • Correct Answer: C

  • Rationale: Chloride ions (Cl-) have a negative charge because they gained an electron. When an atom gains an electron, it increases the number of negative charges relative to positive charges, resulting in a net negative charge, as seen in chloride ions.

Question 3:

An organism with an unknown genotype is crossed with another organism that shows the recessive trait (aa). The Punnett square above shows the results. What is the unknown genotype?

  • A: a
  • B: Aa
  • C: AA
  • D: aa
  • Correct Answer: B

  • Rationale: In the given Punnett square, where the recessive trait (aa) is observed, the unknown genotype can be deduced. Since the recessive trait is expressed, the known organism must be homozygous recessive (aa). The unknown genotype, when crossed with aa, would result in a 50% chance of producing heterozygous offspring (Aa). Therefore, the correct answer is B, Aa.
The triple point of a substance is the temperature and pressure at which of the substance exists as which of the following?

Question 4:

What is the triple point of a substance?

  • A: Simultaneously in solid, liquid, and gas phases.
  • B: As soil with gas and solid trapped in liquid.
  • C: As a gel with solid and liquid trapped in gas.
  • D: Simultaneously in solid, gel, and plasma phases.
  • Correct Answer: A

  • Rationale: The triple point of a substance refers to the specific temperature and pressure at which the substance can exist in equilibrium as solid, liquid, and gas phases simultaneously. This unique point represents the conditions under which all three phases coexist in equilibrium, allowing for phase transitions without a change in temperature or pressure.

Question 5:

What function does the myelin sheath perform for a nerve cell?

  • A: Sensory perception
  • B: Insulation
  • C: Nutrition
  • D: Regeneration
  • Correct Answer: B

  • Rationale: The myelin sheath acts as an insulator for nerve cells, allowing for faster transmission of electrical impulses along the nerve fiber. This insulation helps to maintain the efficiency and speed of nerve signal conduction. Sensory perception involves the detection of sensory stimuli, nutrition is related to the supply of nutrients, and regeneration refers to the process of regrowth or repair.

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