Which of the following describes the role that bacteria play in nitrogen fixation?
a. bacteria convert a healthy animal into a sick animal by producing a toxin or growing into a large population.
b. bacteria convert yogurt into cheese, which can be eaten as food by humans or animals.
c. bacteria convert atmospheric carbon dioxide into a form of trapped carbon that animals can use.
d. bacteria convert atmospheric nitrogen into a nitrogen-containing ion that plants can absorb.

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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.

If you were given a map of the sensory cortex in the postcentral gyrus of the cerebrum, do you think the map would have more “space” devoted to the regions of the body that have the highest density of sensory receptors, or the regions of the body that have the lowest density of sensory receptors? explain.