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Biology & Geology (STEM)

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 1 Quiz: Plant Immunity (Structural and Biochemical Defense)

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  • Questions count: 20
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1.
STEM Molecular Genetics Question 22: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They prevent plasmids from entering bacterial cells
They mutate bacterial resistance genes permanently
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
They permanently destroy DNA ligase activity
2.
STEM Immunology Question 5: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Plasma B-cells secreting IgG
Helper T-cells (CD4+ Th) exclusively
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Mast cells releasing histamine
3.
STEM Molecular Genetics Question 26: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
They mutate bacterial resistance genes permanently
They prevent plasmids from entering bacterial cells
They permanently destroy DNA ligase activity
4.
STEM Endocrinology Question 41: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Simple endemic goiter due to iodine deficiency
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
5.
STEM Ecology Question 13: In an arid desert ecosystem, what morphological adaptation enables xerophytic plants like Acacia and Opuntia to survive severe water scarcity?
Absence of xylem vessels and thin cellulose walls
Rapid continuous transpiration during midday heat
Extensive deep or horizontal root systems, thick waxy cutin layers, and sunken stomata
Broad thin leaves with dense stomata on both surfaces
6.
STEM Molecular Genetics Question 30: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They prevent plasmids from entering bacterial cells
They permanently destroy DNA ligase activity
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
They mutate bacterial resistance genes permanently
7.
STEM Geology Question 17: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
Reverse fault caused by lateral compressional stress
Strike-slip fault with purely horizontal displacement
8.
STEM Biology Problem 15: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
120 Cytosine bases and 960 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
9.
STEM Immunology Question 4: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Helper T-cells (CD4+ Th) exclusively
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Mast cells releasing histamine
Plasma B-cells secreting IgG
10.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Plant Immunity: Role of Tyloses and Pre-existing Barriers?
Tyloses are biochemical antibodies synthesized by plant ribosomes
Tyloses accelerate the flow of infected sap to the leaves
Tyloses dissolve the fungal cell wall via chitinase enzymes
Tyloses are balloon-like protrusions of xylem parenchyma cells that grow into xylem vessels through pits to block pathogen spread following vascular damage
11.
STEM Geology Question 7: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Normal fault resulting from crustal extensional (tensional) forces
Reverse fault caused by lateral compressional stress
Thrust fault with an inclination angle less than 45 degrees
Strike-slip fault with purely horizontal displacement
12.
STEM Immunology Question 37: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Helper T-cells (CD4+ Th) exclusively
Mast cells releasing histamine
Plasma B-cells secreting IgG
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
13.
STEM Geology Question 4: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Reverse fault caused by lateral compressional stress
Normal fault resulting from crustal extensional (tensional) forces
Strike-slip fault with purely horizontal displacement
Thrust fault with an inclination angle less than 45 degrees
14.
STEM Molecular Genetics Question 32: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They permanently destroy DNA ligase activity
They mutate bacterial resistance genes permanently
They prevent plasmids from entering bacterial cells
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
15.
STEM Molecular Genetics Question 37: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They prevent plasmids from entering bacterial cells
They permanently destroy DNA ligase activity
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
They mutate bacterial resistance genes permanently
16.
STEM Geology Question 11: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Strike-slip fault with purely horizontal displacement
Normal fault resulting from crustal extensional (tensional) forces
Reverse fault caused by lateral compressional stress
Thrust fault with an inclination angle less than 45 degrees
17.
STEM Endocrinology Question 2: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Simple endemic goiter due to iodine deficiency
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
18.
STEM Biology Problem 11: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
19.
STEM Endocrinology Question 8: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Myxedema resulting from severe hypothyroidism in adults
Simple endemic goiter due to iodine deficiency
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Cushing's syndrome from elevated cortisol
20.
STEM Geology Question 38: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
Strike-slip fault with purely horizontal displacement
Reverse fault caused by lateral compressional stress
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