Question 16

read the following prompt and type your response in the space provided.
the male resplendent quetzal bird has evolved to have tail feathers that are approximately 60 cm long. the female quetzal has short tail feathers. using the quetzal as your example, describe how the mechanism of natural selection may have led to the evolution of the male quetzal’s extraordinarily long tail feathers.

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.