Biology Unit test
Grade 8
Duration: 120 min
Name: ----------------
Date: ---------------Grade:…/50
ALL YOUR ANSWERS SHOULD BE SUDMITTED ON THE GIVEN ANSWER SHEET.
1) Indicate wither each statement is true (T) or false (F). If the statement is false,
correct the underlined word. (8 points)
1- Phagocytosis is the process of attacking microbes by natural barriers.
2- Rubella is characterized by the formation of red circular spots on the entire body.
3- Inflammation is the first immune response against inflection.
4- The antibodies are faster in the first contact with a microbe.
5- Antibodies are recognized by the immune system as foreign bodies.
6- AB group has agglutinins O.
7- ABO blood groups are determined by the presence of agglutinogen.
8- The injection of attenuated microbe to induce a specific immune response is called
Serotherapy.
2) Specify for each particularities the type of leukocyte by writing :
M: Monocytes
G: Granulocytes
L: lymphocytes
Some particularities fit more than one type. (7 points)
……… Have a phagocytic ability
……….Round nucleus
………..Cross Capillary walls
……….Secrete antibodies
……….Called polymorphonuclear cells
……….Killer Cells
……….Horseshoe-shaped nucleus
3) Circle the letter that best answers the question or completes the sentence: (10
points)
A. The “biological identity card” specific to each individual is made up by:
a. HLA.
b. NLA.
c. KLA.
B. The signs of rubella include:
a. Fever.
b. Red circular spots on the entire body.
c. Red circular spots on the face.
C. A clinical sign of a disease is a(an):
a. Deficiency.
b. Syndrome
c. Symptom.
d. Congenital.
D. Which of the following is NOT a sign of allergy?
a. Sneezing.
b. Red eyes.
c. Fever.
d. Runny nose.
E. Which of the following is (are) an effect (effects) of allergy?
a. Hay fever.
b. Asthma.
c. Edema
d. A&C
e. All of the above.
F. Which of the following is (are) sign(s) of inflammatory reaction?
a. Redness, heat, pain.
b. Darkness, heat, sweating.
c. Redness, heat, vomiting.
G. What is the component that determines the blood group?
a. Agglutinins
b. Agglutinogen
c. Agglutination
H. What is the organ need to be graft for an immunodeficient baby?
a. Spleen
b. Bone marrow
c. Thymus
I. What are called the T cells attacked by HIV or AIDS?
a. T6 cells
b. T4 cells
c. T2 cells
J. Which one of the following does NOT present a risk of AIDS transmission?
a. Unprotected sex.
b. Transfusion of blood
c. Handshaking
d. Use of needles.
Read the following paragraph and use the table’s information to answer the following
questions: (6points)
Skin graft experiments are performed on two genetically different rabbits. The table below
indicates in each case the donor, the recipient, and the graft outcome.
Donor
Recipient
Result
Experiment 1
Rabbit A
Rabbit A
Accepted
Experiment 2
Rabbit B
Rabbit A
Rejected after 11 days
Experiment 3
Rabbit B
Rabbit A
Rejected after 6 days
(40 days later)
1. What is the graft type of experiment 2?
a. Allograft.
b. Isograft.
c. Autograft.
2. Why the graft is rejected more rapidly the second time?
a. Natural barrier detect the different HLA.
b. Antigen develops a memory.
c. None of the above.
3. What is the type of immune response involved in experiments 3?
4. What is the reason of the first graft success AND second graft rejection?
5. Explain the procedure of immunological memory?
4) Answer briefly to the following questions: (10.5 points)
1. List the three types of graft. (1.5 points)
2. What is the difference between “self” and “non-self”? (1 points)
3. List the organs of the immune system, AND the natural barriers. (3.75
points)
4. How antigen and antibody bind together? (0.5 points)
5. List the steps of phagocytosis. (1.5 points)
2. To explain the
6. Explain why group O can donate to all others groups and can’t take from A
and B group? (Specify the reason of acceptance and rejection) (1 points)
7. Explain the two phases of allergy. (1.25 points)
5) A boy was injured during a football game. When he got back home, he did not
mention the incident to his parents and did not take care of his wound. A few days
later, his wound was infected. (2 points)
1. Explain briefly the phenomena of inflammatory reaction. (1 point)
3. What should he have done? Justify. (1 point)
6) Attenuated diphtheria toxin is injected to a mouse. One month later, mouse blood is
drawn, and plasma and blood cells are separated. Plasma is injected to mice of bath
1; cells are injected to mice of bath 2. Both batches receive an injection of diphtheria
toxin, at a normally fatal dose. Indeed, all mice of batch 2 die. However, mice of
bath 1 survive.
a- Explain this result. (1 point)
b- What is the type of immune response involved in this experiment? Justify. (1
point)
7) Translate the following table to a line graph. (3 point)
a. Draw the scale (0.5 pt)
b. Write a title for the graph (1 pt)
weeks
Amount of anti-cholera antibodies in the
plasma
1(Injection of vaccine)
5 mg
2
20 mg
3
15 mg
4 (Injection of virulent bacteria)
10 mg
5
22 mg
6
25 mg
7
40 mg
8
45 mg
9
50 mg
10
58 mg
11
60 mg