Exam 5: Energy, Metabolism, and Enzymes

In photosynthesis,the carbon used to make sugars is

In a study,researchers put human participants on a treadmill for 10 minutes and then drew blood samples.They found that blood levels of certain "exercise metabolites" increased after the participants exercised.When the researchers added these "exercise metabolites" to mouse muscle cells cultured in a lab dish,the cells increased the rate at which they were burning ________.

Which of the following statements best describes how extremes of pH often disrupt the function of enzymes?

The application of modern biological research methods has shown that the most successful strategy for permanent weight loss almost always involves

Living systems must work to remain ordered;they pass off their disorder to the universe in the form of

Chemical reactions in which reactants have a lower energy content than the products can occur without the input of any energy.

Which of the following organisms is NOT an ectotherm?

At very high salt concentrations,the three-dimensional structure of proteins is often stabilized;therefore,these salt concentrations play a major role in enhancing the activity of many enzymes.

Some enzymes need particular ions or small molecules to attain their highest activity;these enzyme "helpers" are known as ________.

Sugar molecules are more oxidized than carbon dioxide molecules.

As a molecule becomes oxidized,it loses electrons.

During a chemical reaction,a cell uses all the chemical energy in ATP.

Carbon dioxide is one product of a metabolic process that occurs in both plants and animals;this process is called ________.

In the chemical reaction C₆H₁₂O₆ + 6 O₂ $\rarr$ 6 CO₂ $\rarr$ 6 H₂O,the 6 CO₂ molecules are some of the

Organisms that maintain a constant body temperature rely on the heat produced by cells.Where does this heat come from?

In a research study,physiologists monitored the metabolite concentrations generated during exercise in three groups of participants (people with poor fitness,average fitness,and exceptional fitness).Which statement best summarizes this study's findings?

Which of the following statements about the role of enzymes in chemical reactions is true?

During photosynthesis,light energy is converted into chemical energy,which is a type of

In a metabolic pathway,the product of an enzyme-catalyzed reaction becomes the substrate for the next reaction in the pathway.

Imagine a chemical reaction during which a solution turns from red to green very slowly.If a small piece of platinum is placed in the solution,the change occurs much more rapidly,yet the platinum remains unchanged;this result happens because the platinum