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Biology & Geology

Chapter 1 - Support and Movement in Living Organisms

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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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Chapter 7 - Geology, Earth Sciences and Ecology

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Quiz

Lesson 2 Quiz: Rock Cycle, Minerals, Crystallography and Weathering

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  • Questions count: 20
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1.
Which of the following hormones is secreted by the pituitary gland and indirectly affects basic metabolic processes and the speed of oxygen consumption?
ADH hormone
The hormone oxytocin
Insulin hormone
Thyroid stimulating hormone (TSH).
2.
The polyadenyne tail (Poly-A Tail) added to the end of the mRNA molecule in eukaryotes consists of about 200 adenine nucleotides and functionally functions to:
Protecting the mRNA molecule from degradation by enzymes in the cytoplasm
Encoding polar amino acids
Binding to the polymerase enzyme
Formation of the nuclear envelope
3.
Telomeres are found at the ends of eukaryotic chromosomes and perform an important function in:
Protecting chromosomes from corrosion and merging with each other and maintaining their structure
Centromere doubling
Construction of ribosomes
Synthesis of enzymes
4.
A segment of a DNA double helix consisting of 600 nucleotides. The number of complete turns in this segment is equal to:
15 roll
60 roll
30 Full roll
10 Rolls
5.
The phenomenon of natural parthenogenesis in honey bees results in:
Bees are always male, and their somatic cells are haploid (1N) resulting from an unfertilized egg that grows mitotically.
Fertile queens (2N)
Diploid males
Female workers only
6.
The number of amino acid molecules in a polypeptide chain resulting from mRNA translation consisting of 303 nucleotides, including the start and stop codons, is equal to:
101 Acid
100 Amino acid
99 Acid
300 Acid
7.
Which of the following amino acids is considered a non-protein acid produced by plants as protective and toxic substances for microorganisms?
Methionine and tryptophan
Glycine and alanine
Canavanine and cephalosporin
Valine and leucine
8.
The pulling movement occurs in bulbs and corms (such as carcasses and daffodils) with the aim of:
Pull the stored ground leg down to an appropriate level from the soil surface to secure and support it against the wind
Getting rid of carbon dioxide
Repel terrestrial insects
Light absorption for photosynthesis
9.
Which of the following oxides is amphoteric?
MgO
Na2O
ZnO
SO3
10.
The method of action of antibodies that is considered the most appropriate and most efficient in inactivating viruses and preventing their penetration into cells is:
Deposition method
Alignment method
Neutralization method
Decomposition method
11.
Substances secreted by T helper cells (Th) and acting as a communication tool to activate neighboring B and T cells are:
Myoglobin
Interleukins
Antibodies
Hemoglobin
12.
We visited the pottery village in Fustat ________ our holiday in Cairo.
while
when
as
during
13.
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
In any double-stranded DNA molecule, the percentage of Adenine equals Thymine (%A = %T) and Guanine equals Cytosine (%G = %C), with purines equaling pyrimidines
Uracil replaces Thymine in the double helix of nuclear DNA
The percentage of %A + %T always equals 50% in all organisms
14.
The atom in the pentose sugar molecule (dioxyribose) to which the nitrogenous base is linked by a covalent bond is:
Carbon atom number 2'
Carbon atom number 5'
Carbon atom number 3'
Carbon atom number 1' (C1')
15.
Party 3' For a DNA strand that ends with a group:
Free carboxylate (-COOH)
Free hydroxyl (-OH)
Free phosphate (-PO4)
Free amine (-NH2)
16.
Natural killer (NK) cells attack and kill cancer cells and virus-infected cells by:
Histamine secretion
Swallow the cells whole
Secretion of antibodies
Secretion of specialized digestive enzymes without the need for prior specific antigen recognition
17.
An ionic bond is formed primarily between:
Positive metal ions immersed in a sea of delocalized electrons
Two non-metal atoms sharing pairs of valence electrons equally
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Noble gas atoms at very low temperatures
18.
DNA Repair Enzymes, which number approximately 20 enzymes, depend for their work on:
The presence of a corresponding healthy template strip complementary to the damaged strip to guide its sequence in repair
Destruction of the infected cell
Production of lipoproteins
Heat irradiation of the cell
19.
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
Mitochondrial aggregation
Accumulated peripheral granules
20.
Which of the following hormones is considered a steroid hormone (derived from fat and cholesterol)?
Progesterone and testosterone
Growth hormone (GH)
Insulin
Thyroxine
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