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NLN PAX Science (Latest Update 2025 / 2026) Questions and Answers | Grade A | 100% Correct (Verified Solutions)
Question:
A lab technician has the choice of four different enzymes to use in an experiment that will run at 25°C. The optimal temperatures of enzymes using the Kelvin scale are: Enzyme A: 273 K, Enzyme B: 298 K, Enzyme C: 310 K,
Enzyme D: 325 K. Which enzyme would be the best to use in this experiment?
- Enzyme A
- Enzyme B
- Enzyme C
- Enzyme D
Answer:
Enzyme B
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Question:
Which of these structures contains valves to prevent blood from flowing in the wrong direction?
- Veins.
- Arteries.
- Capillaries.
- Lymph ducts.
Answer:
Veins.
Question:
Which of these structures produces sperm cells in human males?
- Urethra.
- Prostate gland.
- Testes.
- Cowper's glands.
Answer:
Testes.
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Question:
A gram stain is an important technique used in the laboratory that
- identifies different types of blood cells.
- is sensitive to specific types of plants.
- highlights nucleus containing cells.
- distinguishes between different kinds of bacterial cell walls.
Answer:
distinguishes between different kinds of bacterial cell walls.
Question:
A lens that focuses distant light to a single point is known as a
- converging lens.
- diverging lens.
- concave lens.
- prismatic lens.
Answer:
converging lens.
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Question:
A material that settles out of a reaction is termed a(n)
- suspension.
- precipitate.
- colloid.
- emulsion.
Answer:
precipitate.
Question:
A recently discovered species has these characteristics: amniotic eggs, a four-
chambered heart, and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be present?
- Mammary glands.
- External fertilization.
- Ectotherms.
- Feathers for flying.
Answer:
Feathers for flying.
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