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Biology & Geology

Chapter 1 - Support and Movement in Living Organisms

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Chapter 2 - Hormonal Coordination in Living Organisms

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Chapter 3 - Reproduction in Living Organisms

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Chapter 4 - Immunity in Living Organisms

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Chapter 5 - Molecular Biology - DNA Structure and Function

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Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

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Chapter 7 - Geology, Earth Sciences and Ecology

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Quiz

Lesson 2 Quiz: The Human Immune System (Organs, Cells, and Antibodies)

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  • Questions count: 20
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1.
According to the 2026/2027 Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Chargaff's Rules of DNA Base Pairing?
The percentage of %A + %T always equals 50% in all organisms
Uracil replaces Thymine in the double helix of nuclear DNA
In any double-stranded DNA molecule, the percentage of Adenine equals Thymine (%A = %T) and Guanine equals Cytosine (%G = %C), with purines equaling pyrimidines
Adenine bonds with Guanine via three hydrogen bonds
2.
The antibody that is transferred across the placenta from the blood of the pregnant mother to the blood of the fetus to give it natural, passive, acquired immunity is:
IgG
IgE
IgM
IgD
3.
DNA Repair Enzymes, which number approximately 20 enzymes, depend for their work on:
Destruction of the infected cell
The presence of a corresponding healthy template strip complementary to the damaged strip to guide its sequence in repair
Heat irradiation of the cell
Production of lipoproteins
4.
When severe dehydration and decreased blood volume and body fluids occur, which of the following hormonal changes occur?
ADH decreases and insulin increases
Calcitonin secretion increases
The secretion of ADH and aldosterone increases to restore water and salts
Thyroxine secretion stops
5.
In the secondary immune response upon exposure to the microbe for the second time, the response is characterized as:
Slow and takes days
It is very rapid and produces huge amounts of antibodies thanks to memory cells, and the individual does not show symptoms of the disease
Limited to non-specialized immunity
Rely only on the first line of defense
6.
The gland that secretes both external ductal secretion and non-ductal hormonal secretion directly into the blood is:
pituitary gland
Pancreas (common/mixed gland)
Adrenal gland
Thyroid gland
7.
The lymphatic organ, which is called the graveyard of old and worn-out red blood cells and contains large numbers of macrophages, is:
Spleen
appendix
Tonsils
Thymus gland
8.
Artificial parthenogenesis in flowering plants (such as the production of seedless oranges or watermelons) is carried out by:
Irradiating seeds with X-rays
Tissue culture
Pen vaccination
Spraying flower stigmas with pollen extract or indole acetic acid to stimulate the ovary to form fruit without fertilization
9.
Which of the following first-row transition metal ions exhibits the highest theoretical magnetic moment in its ground state?
Cu2+ ([Ar] 3d9 with 1 unpaired electron)
Cr3+ ([Ar] 3d3 with 3 unpaired electrons)
Fe3+ ([Ar] 3d5 with 5 unpaired electrons)
Zn2+ ([Ar] 3d10 with 0 unpaired electrons)
10.
Beta cells in the islets of Langerhans in the pancreas are responsible for secreting the hormone:
Glucagon
Insulin
Pepsin
Somatostatin
11.
The hormone that is secreted from the corpus luteum and reaches its maximum concentration on days 21 to 23 of menstruation is:
FSH hormone
Estrogen
Progesterone
LH hormone
12.
The fetal membrane that directly surrounds the fetus and secretes a fluid that protects it from shock and dehydration and facilitates its movement is:
Amniotic membrane (Chorion)
Vitelline membrane
Amnion
Plasma membrane
13.
If a sample of a DNA double helix contains 30% Cytosine (C), the percentage of adenine (A) bases in this sample is equal to:
30%
40%
70%
20%
14.
Fructose, which is found in semen to nourish sperm outside the testicle, is secreted by:
Prostate gland
Tomorrow Cooper
Epididymis
The seminal vesicles
15.
The hormone that is secreted from the stomach lining and travels through the blood to return to the same stomach, stimulating it to secrete its digestive gastric juices, is:
Gastrin hormone
Secretin hormone
Cholecystokinin hormone
Pepsin hormone
16.
The movement of tension in the tendrils of climbing plants such as peas and grapes depends physiologically on:
Slow growth of the area in contact with the support and rapid growth of the area far from it as a result of the varying distribution of auxins
Degeneration of tendril cells
Water loss through rapid transpiration
Secretion of gluey substances
17.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
28%
44%
56%
22%
18.
Combined contraceptive pills are considered an effective method because they:
The fallopian tubes close mechanically
Placental abruption
It contains synthetic hormones similar to estrogen and progesterone that inhibit the secretion of FSH and LH from the pituitary, thus preventing the maturation of eggs and the occurrence of ovulation.
It kills sperm
19.
Interstitial cells in the human male testicle respond directly and secrete testosterone under the influence of a pituitary hormone:
Luteinizing hormone (LH)
FSH hormone
Prolactin hormone
Growth hormone
20.
What is the structural characteristic of a restriction endonuclease recognition site?
It is a palindromic sequence reading identical 5' to 3' on both strands.
It contains only adenine and thymine bases.
It always begins with the start codon AUG.
It consists of 15-20 repetitive nucleotides.
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