general properties of proteins

Question 1

what are amino acids

Answer 1

the monomers fro which proteins are made

Question 2

what is the general structure of an amino acid

Answer 2

. R
H2N —–C—- COOH
H
amine group carboxyl group

Question 3

how many different amino acids are there and what differes

Answer 3

20
R group

Question 4

what bond forms between amino acids and how

Answer 4

peptide
OH on carboxyl group and H from amine group form water molecule
bond between C=O and N-H

Question 5

what is a functional protein

Answer 5

may contain one or more polypeptides

Question 6

what is the primary structure of a protein

Answer 6

sequence of amino acids in a polypeptide chain

Question 7

what is the secondary structure of a protein

Answer 7

hydrogen bonding between amino acids
causes polypeptide chain to fold into a repeating pattern eg. alpha helix, beta pleated sheets

Question 8

what is the tertiary structure of a protein

Answer 8

overall 3D structure is a polypeptide help together by interactions between amino acids side chains
ionic bonds
disulfide bridges
hydrogen bonds

Question 9

what is the quaternary structure of a protein

Answer 9

2+ polypeptide chains held by hydrogen, ionic and disulfide bonds

Question 10

where are proteins found in organism

Answer 10

enzymes
antibodies
ribosomes

Question 11

what is the test for proteins

Answer 11

biuret
positive = purple
detects presence of peptide bonds