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Biology & Geology

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: Types of RNA, Genetic Code and Protein Translation

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1.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
To prevent solar radiation from penetrating the foundation
To allow fish to swim upstream through drainage gates
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
To reduce the gravitational pull of the bedrock
2.
The density of an ideal gas at temperature T and pressure P is rho. If the pressure is tripled and the absolute temperature is halved, the new density becomes:
1.5 rho
6 rho (since rho is proportional to P / T)
0.67 rho
3 rho
3.
According to the 2026/2027 Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Chargaff's Rules of DNA Base Pairing?
Adenine bonds with Guanine via three hydrogen bonds
The percentage of %A + %T always equals 50% in all organisms
Uracil replaces Thymine in the double helix of nuclear DNA
In any double-stranded DNA molecule, the percentage of Adenine equals Thymine (%A = %T) and Guanine equals Cytosine (%G = %C), with purines equaling pyrimidines
4.
The global scientific project that was able to decipher and arrange more than 3 billion pairs of nitrogenous bases in human cells is:
Virus study project
Stem cell project
Human Genome Project
Acquired immunity project
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