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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: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands

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1.
Why is the genetic code described as 'degenerate' or 'redundant'?
One codon can code for multiple different amino acids.
Multiple different codons can code for the same single amino acid.
The genetic code decays as the cell ages.
The genetic code differs completely between bacteria and humans.
2.
To distinguish between a white precipitate of barium sulfate (BaSO4) and a white precipitate of barium phosphate (Ba3(PO4)2), one should add:
Ammonium hydroxide solution
Dilute hydrochloric acid (Ba3(PO4)2 dissolves while BaSO4 remains insoluble)
Concentrated nitric acid in the dark
Boiling distilled water
3.
The indicator that exhibits a yellow color in acidic medium, blue in alkaline medium, and green in neutral medium is:
Bromothymol blue
Methyl orange
Phenolphthalein
Litmus solution
4.
The common ratio r of the geometric sequence (64, 32, 16, 8, ...) is:
r = 2
r = -1/2
r = 4
r = 1/2
5.
The sum to infinity of the geometric series 12 + 6 + 3 + 1.5 + ... equals:
24
36
Infinity
18
6.
The slope of the tangent to the curve y = (x + 1)/(x - 1) at x = 2 is:
-1
3
-2
2
7.
A solution with a pH value of 3.0 is classified as:
Strongly alkaline
Strongly acidic
Neutral
Weakly basic
8.
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
Uracil replaces Thymine in the double helix of nuclear DNA
The percentage of %A + %T always equals 50% in all organisms
In any double-stranded DNA molecule, the percentage of Adenine equals Thymine (%A = %T) and Guanine equals Cytosine (%G = %C), with purines equaling pyrimidines
9.
DNA hybridization depends on the ability of single strands from different sources to combine if:
They are just the same height and weight
Treatment with shortening enzyme
Made in the same cell
They contain complementary sequences of nitrogenous bases and are linked by hydrogen bonds
10.
Polyribosome is a vital cellular structure consisting of:
A large number of ribosomes (up to 100 ribosomes) attach to a single mRNA molecule to translate it simultaneously and quickly build many copies of the protein.
Fusion of two nuclei
Accumulated peripheral granules
Mitochondrial aggregation
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