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Absorption of radiation corresponding to what portion of the electromagnetic spectrum is most likely to excite Aequorea fluorophore, a green fluorescent protein used in biological experiments? A. Ultraviolet B. Infrared C. Orange D. Microwave
Which of the following statements are true? I. The blood velocity and pressure are higher in arteries than in capillaries. II. Blood vessels do NOT follow Bernoulli’s principle if viscosity of blood is taken into account. III. For an incompressible…
A 1-L beaker is filled with 2 moles of liquid methanol and 0.25 moles of NaCl. The ratio of ions to atoms in this solution is: A. 0.5:2 B. 1:6 C. 1:25 D. 3:1
Which of the following is most likely the excitatory neurotransmitter released into the synaptic cleft between the inner ear hair cells and their spiral ganglion? A. GABA B. Acetylcholine C. Serotonin D. Glutamate
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…