The difference in an area with high concentration and an area with low concentration is called
The variant.
The concentration gradient.
Level gradient.
The osmotic pressure.
Turgid pressure.
The Correct Answer is B
Choice A rationale: The variant is a term used to describe a viral genome that may contain one or more mutations. It is not related to the difference in concentration between two areas. ³
Choice B rationale: The concentration gradient is the correct term for the difference in concentration between two areas. It is a measure of how steep the change in concentration is. ¹
Choice C rationale: Level gradient is not a term used in biology or chemistry. It may refer to the slope of a surface or a line, but not to the concentration of solutes in a solution.
Choice D rationale: The osmotic pressure is the minimum pressure required to prevent the flow of solvent molecules through a semipermeable membrane. It depends on the concentration of solute particles in the solution and is calculated with the formula π = iCRT. It is not the same as the concentration gradient, although it is related to it. ⁴
Choice E rationale: Turgid pressure is the force exerted by stored water against a cell wall. It is caused by the osmotic flow of water and occurs in plants, fungi, and bacteria. It is also called hydrostatic pressure and affects cell growth, movement, and dispersal. It is not the same as the concentration gradient, although it is influenced by it. ⁵
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C","D","E"]
Explanation
Choice A rationale: Density of media affects the rate of diffusion because it influences the frequency of collisions between the diffusing molecules and the molecules of the medium. The denser the medium, the slower the diffusion rate, and vice versa.
Choice B rationale: Size of molecules affects the rate of diffusion because it determines how easily the molecules can move through the spaces between the molecules of the medium. The smaller the molecules, the faster the diffusion rate, and vice versa.
Choice C rationale: Concentration gradient affects the rate of diffusion because it is the difference in concentration of the diffusing molecules between two regions. The higher the concentration gradient, the faster the diffusion rate, and vice versa.
Choice D rationale: Membrane permeability affects the rate of diffusion because it is the ability of the membrane to allow the diffusing molecules to pass through it. The more permeable the membrane, the faster the diffusion rate, and vice versa.
Choice E rationale: pH affects the rate of diffusion because it is the measure of acidity or alkalinity of the medium. pH can affect the charge and shape of the diffusing molecules, which can affect their ability to cross the membrane or interact with the molecules of the medium. pH can also affect the membrane permeability by altering the charge and shape of the membrane proteins.
Correct Answer is B
Explanation
Choice A rationale: Up and down is incorrect because the mechanical stage upper knob does not control the vertical movement of the stage. The vertical movement of the stage is controlled by the coarse and fine adjustment knobs, which are located on the side of the microscope. The coarse adjustment knob is used to raise or lower the stage quickly, while the fine adjustment knob is used to fine-tune the focus of the specimen.
Choice B rationale: Right and left is correct because the mechanical stage upper knob controls the horizontal movement of the stage along the x-axis. The mechanical stage is a platform that holds the slide and the specimen, and it can be moved by two knobs that are located below the stage. The upper knob moves the stage right or left, while the lower knob moves the stage forward or backward.
Choice C rationale: Back and forth is incorrect because the mechanical stage upper knob does not control the horizontal movement of the stage along the y-axis. The horizontal movement of the stage along the y-axis is controlled by the mechanical stage lower knob, which is located below the stage and next to the upper knob. The lower knob moves the stage forward or backward, while the upper knob moves the stage right or left.
Choice D rationale: All of the answer choices are correct is incorrect because only one of the answer choices is correct. The mechanical stage upper knob only causes the stage to move right or left, not up and down or back and forth. The other movements of the stage are controlled by different knobs.
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