4. What do you think would happen to the amount of oxygen in the atmosphere if all of Earth's algae suddenly died off?
5. True or False: Plants and animals perform respiration.
6. True or false: Once animals use oxygen, it can never be replaced.
7. True or False: Algae cannot make their own food.
8. True or False: Plants produce oxygen as a waste product of
photosynthesis.

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

atp is used for energy.