An average adult human requires 2,200 kcal of energy per day. Suppose your diet provides an average of 2,300 kcal per day. How many hours per week would you have to walk to burn off the extra calories? Swim? Run? (See Figure 6.4.)

Metabolic pathways in cells are typically far from equilibrium. Which of the following processes tend(s) to keep these pathways away from equilibrium?

Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as is to .a. exergonic; spontaneousb. exergonic; endergonicc. free energy; entropyd. work; energy

Which of the following metabolic processes can occur without a net influx of energy from some other process?a. ⓅADP+Ⓟi→ATP+H2Ob. C6H12O6+6O2→6CO2+6H2Oc. 6CO2+6H2O→C6H12O6+6O2d. Aminoacids→Protein

Explain how your body can convert excess carbohydrates in the diet to fats. Can excess carbohydrates be converted to protein? What else must be supplied?

SCIENTIFIC THINKING Several studies have found a correlation between the activity levels of brown fat tissue in research participants following exposure to cold and their percentage of body fat. Devise a graph that would present the results from such a study, labeling the axes and drawing a line to show whether the results show a positive or negative correlation between the variables. Propose two hypotheses that could explain these results.

Which of the following correctly states the relationship between anabolic and catabolic pathways?