BIO 141 UNIT 1 EXAM NEWEST ACTUAL QUESTIONS

BIO 141 UNIT 1 EXAM NEWEST ACTUAL / QUESTIONS

AND ANSWERS VERIFIED /GRADED A+!!

basic role of quaternary - ----Answers---combination of polypeptides, sub-units multiple polypeptides interact to form a single structure

what is the correct way of writing a protein sequence - ---- Answers---start at the N-termini followed by the C-termini

is there a limit to the number of primary structures - ---- Answers---NO

in which structure does hydrogen bonding mostly occur - ---- Answers---secondary structure

alpha helix - ----Answers---proteins backbone is coiled

beta pleated sheet - ----Answers---segments of the peptide chain bends 180 and then folds in the same place that it bended

what are the 5 types of interactions that can occur between r- groups or r-groups and backbones - ----Answers---1.hydrogen bonding 1 / 3

• hydrophobic interactions
• van de waals interactions
• covalent bonding
• ionic bonding

hydrogen bonding - ----Answers---formed between polar r- groups and opposite partial charges in peptide backbone or other r-groups

hydrophobic interactions - ----Answers---water molecules interact with hydrophillic polar side chains of the polypeptide, forcing hydrophobic nonpolar side chains to go into globular masses. R-groups come together and surround water

van der waals interactions - ----Answers---constant motion of electrons give molecules tiny asymmetry, very weak forces but help stabilize

covalent bonding - ----Answers---formed between side chains of 2 cysteines through reactions of sulfhydryl groups

disulfide bonds - ----Answers---2 sulfur create strong links with distinct regions of the same polypeptide or 2 different

ionic bonding - ----Answers---formed between groups of full and opposite charges

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dimers - ----Answers---proteins with 2 polypeptides subunits

tetramer - ----Answers---proteins with 4 polypeptide subunits

macromolecular machines - ----Answers---groups of multiple proteins that assemble to carry out a particular function

do the structure of proteins depend on each other? - ---- Answers---yes

is folding spontaneous - ----Answers---yes

denatured - ----Answers---an unfolded protein, unable to function normally

molecular chaperones - ----Answers---protein that facilitates the folding of newly synthesized proteins into the correct 3d shape

what do heat shock proteins do - ----Answers---recognize denatured proteins by binding to hydrophobic patches that are not normally exposed in properly folded proteins

are proteins rigid and static or dynamic and flexible - ---- Answers---dynamic and flexible

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