Chapter 3: What Do Proteins Look Like?

Question 1

primary structure

Answer 1

the unique sequence of amino acids in a protein

Question 2

the order of the R-groups present in a polypeptide with affect that molecule’s ______ and ______

Answer 2

properties, function

Question 3

primary structure is fundamental to its ______

Answer 3

function

Question 4

Primary structure is also fundamental to the higher levels of _______ _______

Answer 4

protein structure

Question 5

secondary structure is characterized by the _______ ______ that occurs between amino acids

Answer 5

hydrogen bonding

Question 6

hydrogen bonding between sections of the same backbone is possible only when a polypeptide ______

Answer 6

bends

Question 7

alpha helix

Answer 7

polypeptide’s backbone is coiled

Question 8

beta pleated sheet

Answer 8

segments of a peptide chain bend 180° and then fold in the same plane

Question 9

Each of the hydrogen bonds in an α-helix or a β-pleated sheet is _____relative to a covalent bond, but a large number of hydrogen bonds in these secondary structures makes them _____ _____. As a result, they increase the _____ of the molecule as a whole and help define its _____.

Answer 9

weak, highly stable, stability, shape

Question 10

tertiary structure is a protein’s overall _____-_____ _____ that results from interactions between _____ that are brought together as the backbone bends and folds in space

Answer 10

three-dimensional shape, residues

Question 11

tertiary structure depends on both _____ and _____ structures.

Answer 11

primary, secondary

Question 12

quaternary structure is the combination of _____, referred to as subunits

Answer 12

polypeptides

Question 13

macromolecular machines are cells that have complexes of ______ _____ that assemble to carry out a particular _____ (ex: the ribosome)

Answer 13

multiple proteins, function

Question 14

they key thing to note is that protein structure is _____

Answer 14

hierarchical