An X linked trait is expressed in some cells of a female body but not in others. How can you explain this phenomenon?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

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.