Download Exam Questions for Lesson 1

Christ The King School
(b)
Give two structures a bacterial cell may have that a white blood cell does not have.
1 .....................................................................................................................
........................................................................................................................
2 .....................................................................................................................
........................................................................................................................
(2)
Q2.
Different cells in the body have different functions.
(a)
Some white blood cells are phagocytic. Describe how these phagocytic white blood
cells destroy bacteria.
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
(Extra space) ...............................................................................................
.....................................................................................................................
.....................................................................................................................
.....................................................................................................................
.....................................................................................................................
(4)
(b
Page 1
Christ The King School
Q3.
(a)
Describe how each of the following parts of the body is protected to prevent
microorganisms entering living cells.
(i)
Skin
.............................................................................................................
.............................................................................................................
(1)
(ii)
Lungs
.............................................................................................................
.............................................................................................................
(1)
(iii)
Eyes
.............................................................................................................
.............................................................................................................
(1)
(b)
Describe how macrophages help to prevent the spread of microorganisms that
enter the blood and other tissues.
......................................................................................................................
......................................................................................................................
......................................................................................................................
......................................................................................................................
(2)
(Total 5 marks)
Page 2
Christ The King School
(b)
Two suitable structures;;
Examples,
1.
Cell wall;
2.
Capsule / slime layer;
3.
Circular DNA;
Reject “circular chromosome”
4.
Naked DNA / DNA without histones;
5.
Flagellum;
6.
Plasmid;
7.
Pilus;
8.
70s / smaller ribosomes;
9.
Mesosome;
2 max
[5]
M2.
(a)
1.
Phagocyte attracted to bacteria by chemicals / recognise antigens on
bacteria as foreign;
2.
Engulf / ingest bacteria;
3.
Bacteria in vacuole / vesicle;
4.
Lysosome fuses with / empties enzymes into vacuole;
5.
Bacteria digested / hydrolysed;
1. Accept names chemical e.g. toxin
2. Allow description of engulfing
3. Accept: bacteria in phagosome
5. Neutral: Break down
5. Accept digestive enzymes destroy bacteria
5. Do not accept “destroy bacteria” as it is in question stem
4 max
[10]
Page 3
Christ The King School
M3.
(a)
(i)
dead cells / keratin as barrier;
(sweat and sebum neutral)
(accept (commensal) skin flora kill / compete with microbe)
(accept skin acidity kills microbes)
1
(ii)
mucus traps microorganisms;
(cilia neutral)
1
(iii)
tears contain lysozyme / contain enzymes which kill microbes;
(accept bactericide)
1
(b)
move to site of infection;
phagocytosis / engulf bacteria;
(digest neutral)
stimulate (T)-lymphocytes / B cells / T cells;
2 max
[5]
Page 4