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Energy from sunlight can excite electrons, kicking them out of their orbitals and creating free radicals. Free radicals are highly reactive atoms or molecules that have unpaired electrons and degrade and destroy other compounds in their vicinity. Carotenoids, one of the pigments present in most chloroplasts, can stabilize these free radicals. This suggests that _____.

Which structure is the site of the synthesis of proteins that may be exported from the cell?

Which protists use flagella for locomotion?

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 needed for the noncatalyzed reverse reaction, C + D  A + B, in the figure?

What are the main groups that are used to categorize living organisms, in a hierarchical order from less to more inclusive?

The science of reconstructing evolutionary history is

Which of the following describes the minimum desired rate of return?

What is the major adaptive advantage of cellular respiration?

Use the following information to answer the questions below.Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.If you ran the same experiment as Engelmann without passing light through a prism, what would you predict?

Mutations that result in a single amino acid substitution in an enzyme _____.