Which of the following statements is correct regarding net diffusion?
Molecular weight of a substance does not affect the rate.
The greater the concentration gradient, the faster the rate.
The rate is independent of temperature.
The lower the temperature, the faster the rate.
The Correct Answer is B
A. Molecular weight of a substance does not affect the rate: The molecular weight affects diffusion because larger molecules move more slowly than smaller ones. Heavier molecules have lower kinetic energy at a given temperature, which slows their movement across membranes.
B. The greater the concentration gradient, the faster the rate: Net diffusion is directly influenced by the difference in concentration between two areas. A steeper concentration gradient increases the driving force for molecules to move, resulting in a faster diffusion rate.
C. The rate is independent of temperature: Temperature affects diffusion because higher temperatures increase the kinetic energy of molecules, making them move faster. Therefore, diffusion rates are not independent of temperature.
D. The lower the temperature, the faster the rate: Lower temperatures reduce molecular motion and kinetic energy, which slows diffusion. Faster diffusion occurs at higher temperatures rather than lower ones.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cholesterols: Cholesterol is a lipid molecule involved in cell membrane structure and as a precursor for steroid hormones, not as a catalyst for biochemical reactions.
B. Triglycerides: Triglycerides are fats used primarily for energy storage and insulation, and they do not function as enzymes.
C. Proteins: Most enzymes are proteins composed of amino acids. Their three-dimensional structure allows them to bind substrates and catalyze biochemical reactions efficiently, making them essential for metabolic processes.
D. Carbohydrates: Carbohydrates serve as energy sources and structural molecules but do not act as enzymes to catalyze reactions.
Correct Answer is B
Explanation
A. Sodium (atomic number 11): Sodium has one electron in its outermost shell, making it highly reactive as it tends to lose that electron to achieve a stable configuration.
B. Neon (atomic number 10): Neon has a full outer electron shell (octet), making it chemically stable and largely unreactive under normal conditions. Its electron configuration prevents it from readily forming chemical bonds.
C. Carbon (atomic number 6): Carbon has four electrons in its outer shell and typically forms covalent bonds to complete its octet, so it is chemically reactive.
D. Oxygen (atomic number 8): Oxygen has six electrons in its outer shell and is highly reactive because it seeks two additional electrons to complete its octet, often forming covalent or ionic bonds.
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