Cell recognition

Cards (10)

1st principle of cell theory
all living organisms are composed of one or more cells
Therefore as viruses are non-cellular, meaning that
they do not have a cell structure, they are not
considered to be living.
Identify the three common components of a cell
structure (3 marks)
A membrane, which encloses the cytoplasm
that contains the cell structures (organelles)
Identify the body system whose cells need to be able
to identify one type of cell from another
(1 mark)
The immune system
what is a pathogen
A micro-organism that can cause disease
What is an antigen
Molecule present on the outer membrane of a pathogen that can be bound to by a specific antibody
What are toxins
Poisonous substances that can be produced by micro-organisms, including bacteria and fungi
Label the diagram
A) phagocyte
B) pathogens
C) antibodies
Despite the use of a different pathogen, state what
must have been similar about this injected virus (when
compared to the smallpox virus) and explain your
answer [2 marks]
The cowpox virus has very similar antigens to the
smallpox virus. This ensures that the antibodies
produced would be effective against the smallpox
virus if this pathogen were to be encountered
Identify the biological mechanism
responsible for this antigen variability
(1 mark)
Evolution through natural selection
label the diagram
A) antigens
B) complementary
C) T memory cells