Which of the following statements concerning protein structure is/are incorrect?
a) the primary structure consists of a chain of amino acids joined by peptide bonds.
b) the secondary structure consists of a twisting or folding of the peptide chai.
c) the tertiary structure refers to the three dimensional shape of the protein.
d) the quaternary structure is present in all proteins and consists of the combination.
e) of several polypeptide chains.

Iron reacts with oxygen to produce iron oxide (rust). this reaction is represented in an equation as 4fe + xo2 → 2fe2o3. identify the value of x that will balance the equation.

How do living things obtain phosphorus

Residential construction is expanding in florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther, which will be the most immediate local result of this fragmentation? 1)large predators will become extinct 2)decrease in middle sized predators 3)increase in population of top carnivores 4)increase in population of prey species