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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cervical region: The cervical region (neck) is part of the axial division, which includes the head, neck, and trunk.
B. Organs of the female reproductive system: These are found within the pelvic cavity, which is part of theaxial body.
C. Carpal region: The carpal region refers to the wrist, which is part of the appendicular division of the body (limbs). It is not included in the axial division.
D. Body cavities: Major body cavities, including the cranial, thoracic, and abdominopelvic cavities, are part of the axial division, providing structural support and housing vital organs.
Correct Answer is A
Explanation
A. The enzyme will denature and become inactive: Salivary amylase works best at a neutral to slightly basic pH, such as in the mouth. Once it reaches the stomach, the highly acidic environment disrupts its three-dimensional structure, causing denaturation and loss of activity
B. The enzyme will continue to function as it remains unchanged in chemical reactions: While enzymes are not consumed in reactions, their activity depends on pH and temperature. At a gastric pH of 2.5, salivary amylase cannot maintain its shape, so it stops functioning.
C. The enzyme will assume an alternate form and catalyze additional reactions: Enzymes are highly specific to their structure and active site. Once denatured, they do not take on new functional forms or catalyze new reactions.
D. The enzyme will denature but retain its function: Denaturation disrupts the enzyme’s active site, preventing substrate binding. If the enzyme denatures, it loses its catalytic ability entirely and cannot retain its original function.
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