Your body contains tens of thousands of different proteins, each with a specific structure and function. the unique three-dimensional shape of each of these diverse proteins is based on several superimposed levels of structure. which of the following statements is/are accurate descriptions of proteins? select all that are correct. a. the primary structure of a protein is the order of amino acids in a polypeptide, as coded for in the dna of a gene. b. the 20 amino acids found in proteins differ in the composition of their r groups. c. secondary structures, which include the alpha helix or beta pleated sheet, are held together by ionic bonds between r groups. d. tertiary structure is the overall shape of a polypeptide, which may be stabilized by hydrophobic interactions and ionic bonds. e. quaternary structure is only found in proteins that have more than one polypeptide subunit

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina