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Biology & Geology (STEM)

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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Quiz

Lesson 1 Quiz: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands

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1.
STEM Molecular Genetics Question 27: 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 prevent plasmids from entering bacterial cells
They permanently destroy DNA ligase activity
They mutate bacterial resistance genes permanently
2.
STEM Geology Question 4: 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
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 prevent plasmids from entering bacterial cells
They permanently destroy DNA ligase activity
They mutate bacterial resistance genes permanently
4.
STEM Molecular Genetics Question 33: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They permanently destroy DNA ligase activity
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
5.
STEM Genetics Question 21: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
150 tRNA molecules
75 tRNA molecules
151 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
6.
STEM Endocrinology Question 44: 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)
7.
STEM Geology Question 42: 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
Strike-slip fault with purely horizontal displacement
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
8.
STEM Immunology Question 20: 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
Mast cells releasing histamine
Helper T-cells (CD4+ Th) exclusively
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
9.
STEM Genetics Question 5: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
150 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
75 tRNA molecules
151 tRNA molecules
10.
STEM Biology Problem 21: 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?
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
11.
STEM Endocrinology Question 39: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Simple endemic goiter due to iodine deficiency
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
12.
STEM Immunology Question 12: 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
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Helper T-cells (CD4+ Th) exclusively
13.
STEM Geology Question 35: 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
14.
STEM Genetics Question 13: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
150 tRNA molecules
151 tRNA molecules
75 tRNA molecules
15.
STEM Biology Problem 35: 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
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
16.
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?
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Simple endemic goiter due to iodine deficiency
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
17.
STEM Biology Problem 39: 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
18.
STEM Biology Problem 41: 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?
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
19.
STEM Endocrinology Question 21: 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
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Simple endemic goiter due to iodine deficiency
20.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Parthenogenesis in Honeybees (Apis mellifera)?
Female worker bees develop parthenogenetically without fertilization
Drones produce sperm cells by meiotic division
The queen honeybee produces haploid drones (males, n) from unfertilized eggs via parthenogenesis, whereas diploid worker and queen females (2n) arise from fertilized eggs
Male drones arise from fertilized diploid zygotes (2n)
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