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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: Identification of DNA as Genetic Material — Lesson quiz

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1.
Hershey and Chase successfully exploited which elemental difference to distinguish DNA from protein in bacteriophages?
Nitrogen in DNA vs. Carbon in proteins
Potassium in DNA vs. Sodium in proteins
Oxygen in DNA vs. Hydrogen in proteins
Phosphorus in DNA vs. Sulfur in proteins
2.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Physiological vs. Structural Support in Plants?
Physiological support involves permanent deposition of lignin in stone cells
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
Structural support relies solely on turgor pressure of living parenchyma
Both physiological and structural supports disappear immediately when the plant wilts
3.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Both A-band and myosin filaments shrink by 50% in length
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
4.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Hormonal Regulation of Blood Glucose (Insulin and Glucagon)?
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
Glucagon is secreted by the adrenal cortex under stress
Insulin stimulates the breakdown of liver glycogen into glucose
Alpha cells secrete insulin to elevate blood glucose levels
5.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Parthenogenesis in Honeybees (Apis mellifera)?
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)
Female worker bees develop parthenogenetically without fertilization
Drones produce sperm cells by meiotic division
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