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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 4 Quiz: Menstrual Cycle, Fertilization, Embryonic Development and Contraception

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1.
The derivative of f(x) = 4 x3 - 5 x2 + 7 x - 9 with respect to x is:
f'(x) = 4 x2 - 5 x + 7
f'(x) = 12 x3 - 10 x2 + 7
f'(x) = 12 x2 - 10 x + 7
f'(x) = 12 x2 - 10 x
2.
The derivative of y = sin(3x) with respect to x is:
3 cos(3x)
cos(3x)
3 sin(3x)
-3 cos(3x)
3.
According to the 2026/2027 Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Chargaff's Rules of DNA Base Pairing?
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
Adenine bonds with Guanine via three hydrogen bonds
4.
According to Chargaff's rules's Rules) In the DNA double helix, the equal ratio is always:
A + T = G + C always
A / T = 2
The ratio of adenine A equals thymine T, and the ratio of guanine G equals cytosine C (A+G). = T+C)
A = G And T = C
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