Which compound is a reusable, complex protein that speeds up chemical reactions?

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.

Which of these factors best explains why liquid exists on earth

The higher the proportion of loci that are "fixed" in a population, the lower is that population'sa) nucleotide variability only.b) genetic polyploidy only.c) average heterozygosity only.d) nucleotide variability, average heterozygosity, and genetic polyploidy.e) nucleotide variability and average heterozygosity only.