Which of the following traits allows some bacteria to survive extreme conditions for millions of years?

Trypanosoma is a unicellular, eukaryotic blood parasite that causes African sleeping sickness. Into which of the following groups is it classified?

The  protist groups that include seaweeds?

If photosynthesizing green algae are provided with CO2 containing heavy oxygen (18O), later analysis will show that all of the following molecules produced by the algae contain 18O EXCEPT _____.

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

Which ones are closer related to plants?

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 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?