Which best describes the tertiary structure of a protein?
a. the interaction of polypeptide subunits and prosthetic groups
b. interactions forming hydrogen bonds between the amino acids
c. the sequence of amino acids in the polypeptide chain
d. the structure formed from interactions between the amino acid side groups

Can you identify which of the following groups of organisms are, or are not, populations? a. the american bison (bison bison) and grey wolves (canis lupus) currently living in yellowstone national parkb. all of the rainbow trout (oncorhynchus mykiss that) that have ever lived in lake eriec. the group of american bison (bison bison) currently living in yellowstone national parkd. a group of calliope hummingbirds (selasphorus calliope) and a group of rufous hummingbirds (selasphorus rufus) living in the same new hampshire woodse. the northern cardinals (cardinalis cardinalis) living on opposite shores of lake champlain f. all of the whales currently living in the atlantic ocean off cape cod, massachusetts

Which step is not included in the step approach to calculating the greatest common divisor?

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%