Photosystem I is part of the light-dependent reaction of photosynthesis. A number of complex chemical reactions occur in Photosystem I. What is the main high-energy molecule that is output from Photosystem I? glucose
ATP
oxygen
NADPH

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.