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Flashcards in peptide formation + structure Deck (100)
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1

stereochemistry of peptide bond

trans

2

true structure of peptide bond

resonance hybrid

3

which is stronger, peptide or single bond

peptide

4

which is longer, peptide or single bond

single

5

protein function
proteins accelerate thousands of biochemical reactions in the cell

catalysis

6

examples of proteins involved in catalysis

rubisco (photosynthesis)
hexokinase (first enzyme in glycolysis)

7

most abundant protein in earth

rubisco

8

first enzyme in glycolysis

hexokinase

9

protein function
some proteins provide protection and support

structure

10

ex of proteins for structure

collagen (connective tissue), elastin (elastic fibers), keratin (hair)

11

protein function
proteins are involved in all cell movements and muscle contraction

movement

12

– movement of sperm and protozoa

*dynein

13

protein function
various proteins have protective functions

Defense -

14

ex proteins for defense

keratin
immunoglobulins

15

protein function
various proteins regulate cellular processes

5. Regulation –

16

ex proteins for transport

glucose transporter
hemoglobin
LDL and HDL
transferrin

17

storage proteins containing 20 AA

Casein and ovalbumin

18

example of proteins for toxin

plant lectins, venom of snake

19

protein structure
the order or sequence of amino acids in the polypeptide chains
*Peptide bond is a covalent bond

primary

20

protein structure
conformation of the polypeptide backbone

2ndary

21

protein structure
arrangement in space of all atoms in the polypeptide chain

tertiary

22

protein structure
describes the interaction of the subunits in an oligomeric protein
*stabilized by both covalent & non-covalent forces

quaternary

23

levels of protein structure stabilized by covalent and non-covalent forces

quaternary and tertiary

24

has *intersubunit interaction

quaternary

25

has intrasubunit interaction

tertiary

26

what proteins have quaternary structure

only oligomericproteinswith ≥ 2 subunits
e.g. dimer

27

stabilizing force of secondary structure

H-bonding between the amide proton and carboxyl oxygen

28

the sequence of amino acids linked by peptide bonds.
▪ The backbone of a peptide chain or protein.

primary structure

29

Proteins are composed of ___ only

L-amino acids

30

conformation of the polypeptide backbone (stabilized by H-bonding) without side chains

secondary

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