Hydrogen bonds are most important in this type of structure in proteins: a. primary structure b. secondary structure c. tertiary structure d. quaternary structure e. All of these

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

When plants use sunlight to make food, the energy of sunlight is