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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 2: Recombinant DNA, Gene Cloning, PCR and Genetic Engineering — Lesson quiz

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1.
Bacteria protect their endogenous chromosomal DNA from self-digestion by their own restriction endonucleases through:
Nuclear membrane compartmentalization
Synthesis of protective histone proteins
Rapid degradation of the enzymes
Methylation of recognition sites by modification enzymes
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
Physiological support involves permanent deposition of lignin in stone cells
Both physiological and structural supports disappear immediately when the plant wilts
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)?
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
Z-lines move away from each other as the muscle contracts
Cross-bridges pull actin filaments outward away from the M-line
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)?
Alpha cells secrete insulin to elevate blood glucose levels
Glucagon is secreted by the adrenal cortex under stress
Insulin stimulates the breakdown of liver glycogen into glucose
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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