During the renaissance, the astronomer copernicus suggested the radical notion that
a. the earth was not the center of the universe.
b. the planets determined the course of human events.
c. the alignment of stars could predict the arrival of celestial phenomena.
d. the calendar should have an additional month to accommodate the lunar cycle.

What will happen to the amount of food available as a pondwater ecosystem ages

What best explains the relationship between photosynthesis and cellular respiration?

1. which of the following levels of protein organization shows the complete 3-d arrangement of the polypeptide chain? a) primary b) secondary c) tertiary d) quaternary 2. the carboxyl groups on a protein molecule are composed of which of the following elements? a) nitrogen and hydrogen b) carbon, hydrogen, and oxygen c) carbon and hydrogen d) nitrogen, oxygen, and carbon 3. what part of the protein molecule makes it unique from other proteins? a) the carboxyl group b) the amino group c) the peptide group d) the r group 4. which of the following is an example of a protein that plays a direct role in immune function? a) collagen b) antibodies c) enzymes d) hormones 5. which of the following statements correctly describes the composition of proteins? a) most are composed of 20 common amino acids. b) most are composed of 10 common amino acids. c) most are composed of 20 common fatty acids. d) most are composed of 10 common fatty acids.