Describe one of the interactions between the four major Earth systems.(short answer)

Give the biological term for: structures that display characteristics of living organisms only within living cells

What is the next step in muscle contraction after the actin changes shape? (apex)

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.