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Biological systems use free energy based on empirical data that all organisms require a constant energy input. The first law of thermodynamics states that energy can be neither created nor destroyed. For living organisms, which of the following statements is an important consequence of this first law?

The following questions are based on the reaction A + B  C + D shown in the accompanying figure.Which of the following represents the activation energy required for a noncatalyzed reaction in the figure?

Intercalated discs are cell-cell junctions found between cardiac muscle cells. One feature of these intercalated discs is that they contain a large number of gap junctions, which means that _____.

The phylogenetic distribution of the enzyme rubisco is limited to _____.

A patient diagnosed with moderate stage Alzheimer’s disease has a self-care deficit of dressing and grooming. Designate appropriate interventions to include in the patient’s plan of care. (Select all that apply.)

What is the difference between NAD+ and NADP+?

The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?

The glucose molecule has a large quantity of energy in its _____.

Rate of an enzyme-catalyzed reaction as a function of varying reactant concentration, with the concentration of enzyme constant.In the figure, why does the reaction rate plateau at higher reactant concentrations?

Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?