ATI TEAS Practice Science Test

ATI TEAS Practice Science Test Related

Review ATI TEAS Practice Science Test related questions and content

What presents the correct order of cellular respiration?

  • A. Glycolysis, Acetyl-CoA, Citric Acid Cycle, Electron Transport Chain
  • B. Citric Acid Cycle, Glycolysis, Acetyl-CoA, Electron Transport Chain
  • C. Glycolysis, Acetyl-CoA, Electron Transport Chain, Citric Acid Cycle
  • D. Glycolysis, Citric Acid Cycle, Electron Transport Chain, Acetyl-CoA
Correct Answer: A

Rationale: The correct order of cellular respiration is Glycolysis, Acetyl-CoA, Citric Acid Cycle, and Electron Transport Chain. Glycolysis initiates the breakdown of glucose in the cytoplasm, leading to the formation of pyruvate. This pyruvate is then converted to Acetyl-CoA in the mitochondria, which enters the Citric Acid Cycle to generate energy-rich molecules like NADH and FADH2. Finally, the Electron Transport Chain, located in the inner mitochondrial membrane, utilizes these energy carriers to produce ATP through oxidative phosphorylation. Choice B is incorrect because it starts with the Citric Acid Cycle, which comes after Glycolysis. Choice C is incorrect as it places the Citric Acid Cycle before the Electron Transport Chain. Choice D is incorrect by placing Acetyl-CoA last instead of before the Citric Acid Cycle.

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During which developmental process does the first trimester of gestation roughly correspond?

  • A. Embryogenesis
  • B. Fertilization
  • C. Meiosis
  • D. Menstruation
Correct Answer: A

Rationale: The correct answer is A: Embryogenesis. The first trimester of gestation involves the process of embryogenesis, where the basic structures of the embryo are formed. This period is critical for the development of major organ systems and the establishment of the embryo's overall body plan. Fertilization occurs at the beginning of pregnancy when the sperm fertilizes the egg, marking the start of embryonic development. Meiosis is a cell division process that produces gametes (sperm and egg cells) with half the number of chromosomes. Menstruation is the shedding of the uterine lining when pregnancy does not occur.

Which organ of the body compensates when a person's intake of vitamins decreases?

  • A. Appendix
  • B. Liver
  • C. Pancreas
  • D. Stomach
Correct Answer: B

Rationale: The liver is the organ that compensates when a person's intake of vitamins decreases. It stores certain vitamins, such as vitamins A, D, E, K, and B12, and releases them when dietary intake decreases. This helps maintain the body's vitamin levels and functions. The other organs listed - Appendix, Pancreas, and Stomach - do not primarily play a role in compensating for a decrease in vitamin intake. The liver is crucial in maintaining vitamin balance, making it the correct choice in this context.

After a person eats birthday cake, which of the following enzymes is needed to break down the sucrose in the cake?

  • A. Lactase
  • B. Maltase
  • C. Peptidase
  • D. Sucrase
Correct Answer: D

Rationale: Sucrase is the correct enzyme needed to break down sucrose into its component sugars, glucose, and fructose. Lactase is responsible for breaking down lactose, maltase for maltose, and peptidase for proteins; therefore, they are not the enzymes required to digest sucrose specifically. In the context of digesting birthday cake, which contains sucrose, sucrase is the enzyme needed for this particular sugar.

An atom has 17 protons, 20 neutrons, and 17 electrons. What is its mass, in amu?

  • A. 17
  • B. 20
  • C. 37
  • D. 54
Correct Answer: C

Rationale: The atomic mass of an atom is the sum of the protons and neutrons in its nucleus. In this case, the atom has 17 protons and 20 neutrons, totaling 37 particles in the nucleus. Electrons are not considered in the atomic mass calculation as their mass is negligible compared to protons and neutrons. Therefore, the mass of the atom in atomic mass units (amu) is 37.

At which of the following ages would ossification most likely take place to replace cartilage at the growth plate?

  • A. 5
  • B. 18
  • C. 42
  • D. 91
Correct Answer: B

Rationale: Ossification, the process where cartilage is replaced by bone, typically occurs during adolescence, around the age of 18. This is when the growth plates in the bones close, and the bones stop growing in length, leading to the replacement of cartilage with bone tissue. Choice A (5) is incorrect because ossification primarily occurs during adolescence, not early childhood. Choice C (42) is incorrect as ossification is completed well before this age, usually during the late teens or early twenties. Choice D (91) is incorrect as ossification is a process that occurs earlier in life, typically during adolescence, and is not a process that occurs in advanced age.

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