What is the purpose of the chemical messengers that pass between cells? Check ALL that apply. a To keep the rate of cell division equal with the rate of cell death.

b To help cells reproduce at a rapid rate.

c To inhibit cell death so that fewer new cells are needed.

d To help regulate the rate and timing of cell division.

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

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.

Which of the following does not make up ground substance of connective tissue? hyaluronic acid elastic fibers glycosaminoglycan proteoglycan