If a hydrogen atom has two neutrons and one proton, what is the mass number

What best explains the inability for life to exist in earth early atmosphere

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

During convection, less dense fluid rises and denser fluid sinks.