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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 2: DNA Structure, Replication and DNA Repair Enzymes — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
If a double-stranded DNA molecule contains 20% Cytosine, what is the percentage of Adenine?
40%
60%
20%
30%
2.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Physiological vs. Structural Support in Plants?
Physiological support is temporary and completely dependent on water uptake into vacuoles via osmosis, while structural support is permanent via deposition of cellulose, lignin, or suberin
Both physiological and structural supports disappear immediately when the plant wilts
Physiological support involves permanent deposition of lignin in stone cells
Structural support relies solely on turgor pressure of living parenchyma
3.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Z-lines move away from each other as the muscle contracts
Cross-bridges pull actin filaments outward away from the M-line
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
Both A-band and myosin filaments shrink by 50% in length
4.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Hormonal Regulation of Blood Glucose (Insulin and Glucagon)?
Insulin stimulates the breakdown of liver glycogen into glucose
Glucagon is secreted by the adrenal cortex under stress
Alpha cells secrete insulin to elevate blood glucose levels
Beta cells of the islets of Langerhans secrete insulin to lower blood glucose by stimulating cellular uptake and glycogen synthesis, while alpha cells secrete glucagon to raise blood glucose by glycogenolysis
5.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Parthenogenesis in Honeybees (Apis mellifera)?
Male drones arise from fertilized diploid zygotes (2n)
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
Female worker bees develop parthenogenetically without fertilization
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