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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 1 Quiz: Identification of DNA as Genetic Material

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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
Thyroid stimulating hormone (TSH).
Insulin hormone
2.
The major histocompatibility complex (MHC) protein associates within the macrophage cell with:
Microbe antigen after being broken down by lysosomal enzymes to be displayed on the external surface
Histamine molecules
Perforin protein
Secreted antibodies
3.
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:
100 Amino acid
101 Acid
300 Acid
99 Acid
4.
The global scientific project that was able to decipher and arrange more than 3 billion pairs of nitrogenous bases in human cells is:
Human Genome Project
Acquired immunity project
Stem cell project
Virus study project
5.
The atom in the pentose sugar molecule (dioxyribose) to which the nitrogenous base is linked by a covalent bond is:
Carbon atom number 1' (C1')
Carbon atom number 5'
Carbon atom number 3'
Carbon atom number 2'
6.
Concentrated nitric acid (HNO3) induces chemical passivity on the surface of iron metal due to:
The formation of an extremely thin, non-porous protective oxide film that halts further reaction
The precipitation of elemental sulfur on the surface
Complete neutralization of the acid
The instantaneous dissolution of iron into gaseous ions
7.
The standard start codon in an mRNA molecule recognized by the first tRNA molecule carrying methionine is:
UAA
UAG
UGA
AUG
8.
The number of polar bodies resulting from the maturation and fertilization of 3 primary oocytes in the ovary of a human female is equal to:
3 Polar bodies
6 Polar bodies
12 A polar body
9 Polar bodies (assuming division of the first polar body)
9.
Fructose, which is found in semen to nourish sperm outside the testicle, is secreted by:
Epididymis
The seminal vesicles
Prostate gland
Tomorrow Cooper
10.
The first human protein produced commercially using recombinant DNA technology to treat diabetics is:
Human hormone insulin (Insulin)
Growth hormone
Interferon protein
Hemoglobin
11.
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
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
12.
The outer embryonic membrane that surrounds the uterine membrane and from which digital villi emerge, which are immersed in the uterine lining to form the placenta, is:
Sagging membrane
umbilical cord
Amniotic membrane (Chorion)
Corpus luteum
13.
The common ratio r of the geometric sequence (64, 32, 16, 8, ...) is:
r = -1/2
r = 2
r = 1/2
r = 4
14.
The sequence is repeated more than one hundred thousand times in the middle of one of the chromosomes of the Drosophila insect (fruit fly) and does not code for any protein:
UAA
AGACT
TATAAT
AUG
15.
Sticky Ends resulting from the action of shortening enzymes are characterized by:
Ends surrounded by peptide bonds
Collagen thickened ends
Short, extended single strands of unpaired nucleotides capable of spontaneous association with complementary ends
Inactive phosphate sequences
16.
Experiments using genes for resistance to insect pests in crop plants (such as the Bacillus thuringiensis gene) are an application to:
Genetic engineering and development of genetically modified plants resistant to pests without chemical pesticides
Propagation by hydroponics
Parthenogenetic fruiting
Artificial parthenogenesis
17.
Which of the following oxides is amphoteric?
SO3
MgO
Na2O
ZnO
18.
The relative density (specific gravity) of a substance is defined as:
The mass of the substance divided by its volume at 100°C
The reciprocal of the buoyant force
The product of density and the acceleration due to gravity
The ratio of the density of the substance to the density of pure water at 4°C
19.
Auxins in plants (such as indole acetic acid (IAA)) are chemicals secreted from:
The growing tops and live plant buds are active and move to the response areas
Cork cells
Pollen granules only
Dead wood cells
20.
A metallic cube of side length 10 cm and density 7800 kg/m3 is completely submerged in water (density 1000 kg/m3). The buoyant force (upthrust) acting on the cube is (g = 10 m/s2):
100 N
10 N
78 N
68 N
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