most important exam questio answers imo

Question 1

difference between the structure of globular and fibrous proteins and link that to haemaglobin and collagen (1)

Answer 1

globular proteins are compact and spherical (1) tehy have hydrophillic R groups on the otuside (1) therefore they are soluble in water (1 ). EXAMPLE of a globular protein ins INSULIN (1 )

functuions of haemaglobin : carries and transports oxygen carbon dioxide (1)

contains fe 2+ prosthetic group (1)

.polypeptide chains within haemagblobin have tertiary structure (1)

collagens : long, fibrous (1) and fibres form H bonds with adjacent chains (1) and they are insoluble (1) so they have few hydrophillic group (1) . they are also strong and provide strength (1)

Collagen: high proportions of glycine so chains lie closer together (1) and collagen forms crosslinks between molecules (1) which are STAGGERED to avoid weakpoints (1) . they also form part of the cartillage (1)

Question 2

describe how the structure of antibodies allows them to perform their function ? (7 )

Answer 2

2 light chains and 2 heavy chains / 4 polypeptide
chains ;

variable region allows , binding / attachment , to
antigen ;

two variable regions allow binding of more than
one (of the same) antigen ;

variable region on different antibodies allows specificity
to different antigens ;

constant region allows , recognition by / attachment to /
binding to , (named) phagocytes ;

hinge (region) allows flexibility ;

disulfide , bonds / bridges , hold , polypeptides / light
and heavy chains , together ;

REMEMBER: they for ANTIGEN ANTIBODY COMPLEX1

Question 3

health

Answer 3

Health is the state of physical, mental and social well-being