What functions do proteins perform in the cell membrane? a) they transport some substances through the membrane. b) they use dna coding to make molecules of rna. c) they provide basic structure for the cell membrane. d) they break down macromolecules into their monomer components .

Using the periodic table, determine which material is most likely a good conductor

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.