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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 3 Quiz: Mechanism of the Immune System (Lines of Defense & Humoral/Cellular Immunity)

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  • Questions count: 17
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1.
If f(x) = |x - 3|, the derivative f'(3) at x = 3:
Does not exist because the left-hand derivative (-1) does not equal the right-hand derivative (+1)
Equals -1
Equals 1
Equals 0
2.
The slope of the tangent to the curve y = (x + 1)/(x - 1) at x = 2 is:
-2
3
-1
2
3.
If the tangent to y = x2 - 4x + 5 is parallel to the x-axis, the point of tangency is:
(4, 5)
(2, 0)
(2, 1)
(0, 5)
4.
A metallic bond is physically described as the electrostatic attraction between:
Protons and neutrons in the nucleus
Positive metal cations in the crystal lattice and the mobile sea of delocalized valence electrons
Dipole molecules in a polar liquid
Positive ions and negative non-metal anions
5.
Acids are chemical compounds that dissociate in aqueous solutions to produce:
Hydroxide ions (OH-) turning red litmus paper blue
Sodium ions and chlorine gas
Precipitated metallic salts
Hydrogen ions (H+ or hydronium ions H3O+), turning blue litmus paper red
6.
The reaction between an acid and a base to produce a salt and water is known as a:
Neutralization reaction
Thermal decomposition reaction
Polymerization reaction
Combustion reaction
7.
According to the 2026/2027 Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Chargaff's Rules of DNA Base Pairing?
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
The percentage of %A + %T always equals 50% in all organisms
8.
The movement of hydrotropism in plant roots is considered tropism:
Positive (the root bends in the direction of moisture and water concentration)
Unaffected
randomly
Negatively
9.
Immune chemicals secreted by virus-infected cells to warn neighboring healthy cells to produce enzymes that inhibit virus replication.S is:
Complements
Interferons
Chemokines
Interleukins
10.
Which of the following amino acids is considered a non-protein acid produced by plants as protective and toxic substances for microorganisms?
Methionine and tryptophan
Glycine and alanine
Canavanine and cephalosporin
Valine and leucine
11.
Substances secreted by T helper cells (Th) and acting as a communication tool to activate neighboring B and T cells are:
Myoglobin
Interleukins
Antibodies
Hemoglobin
12.
Reproduction by peaceful association in two adjacent threads of the spirogyra moss (Rem al-Barak) occurs in the case of:
Mild spring
Abundance of pure fresh water
The environment is exposed to drought, change in water purity, or change in temperature (unsuitable conditions)
Complete darkness
13.
Double fertilization in flowering plants involves two fusions:
The fusion of two pollen grains with one egg
Chromosome duplication in Takht cells
The fusion of the zygote nucleus (N) with the egg nucleus (N) to form the zygote (2N), and the fusion of the second nuclei (N) with the two polar nuclei (2N) to form the sperm nucleus.Dosperm (3N)
Fusion of petals with sepals
14.
Hydra and planaria share the ability to reproduce asexually by:
Budding only
Regeneration
Bacteria formation
Longitudinal binary fission
15.
According to Chargaff's rules's Rules) In the DNA double helix, the equal ratio is always:
A / T = 2
The ratio of adenine A equals thymine T, and the ratio of guanine G equals cytosine C (A+G). = T+C)
A = G And T = C
A + T = G + C always
16.
Telomeres are found at the ends of eukaryotic chromosomes and perform an important function in:
Protecting chromosomes from corrosion and merging with each other and maintaining their structure
Construction of ribosomes
Centromere doubling
Synthesis of enzymes
17.
In gene cloning technology, a ligase is used to:
Breaking down proteins
mRNA transcription
Linking the integrated sticky ends of a target gene to the sticky ends of a circular plasmid
Cut the plasmid
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