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The generation of an action potential within a cell is shown in the graph below. Which of the following statements is true of the membrane during repolarization at the indicated by the arrow? A. The voltage-gated sodium channels close stopping…
Which of the following statements accurately orders the speed of sound through the following mediums: air (ρair = 1.275 kg/m3), water (ρwater = 1000 kg/m3), and copper (ρcopper = 8960 kg/m3)? A. Air > water > copper B. Air >…
Given the reduction potentials for the following half-reactions, Br2 (l) + 2e– → 2 Br–(aq) Eored= + 1.07 V Au3+ (aq) + 3 e– → Au (s) Eored= + 1.55 V What is the electrochemical potential for the following chemical reaction? 2…
The plasma membrane maintains the concentration gradients between the intracellular and extracellular spaces. In so doing, some molecules can diffuse directly through the membrane. Which of the following molecule(s) can do so? I. Water II. Testosterone III. Glucose IV. Na+…
In which of the following scenarios is the subject most exhibiting cognitive dissonance? A. A wealthy businessman who never got a college degree pushes his daughter to attend an expensive private university. B. An oncologist who knows the dangers of…
Water does not easily penetrate the skin because: A. dead keratinocytes and oil create a barrier to water penetration. B. false, water easily crosses the skin by passive diffusion through sweat glands. C. skin has a low osmolarity, thereby preventing…
A baseball that lands in a lake (water) experiences a buoyant force of approximately 2N while submerged. A baseball’s mass is specified as 142-149g, or 5-5¼ oz., according to the official rules of baseball. What is the specific gravity of…
If a gas occupies 0.1L at 200atm, what will its volume be at 1atm? A. slightly less than 20L B. 20L C. slightly more than 20L D. 2000L Click for Explanation Ideal gases undergoing pressure and volume changes are related…
Stable expression of harmful recessive traits across generations most likely occurs in populations with a high level of: A. emigration B. natural selection C. inbreeding D. random mating Click for Explanation Stable expression of traits, even harmful recessive traits, most…
A mobile positive charge Qa is placed a distance “d” from a fixed positive charge Qb of equal magnitude. When released from rest, the positive charge Qa will: A. accelerate away from Qb. B. circle Qb along an equipotential electric…