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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: Movement in Plants and Muscle Contraction Mechanics in Humans

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  • Questions count: 20
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1.
The lymphocytes responsible for secreting specific antibodies in humoral immunity are:
Helper T cells (TH)
Macrophages
Plasma B cells
Natural killer (NK) cells
2.
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
3.
Rotational cytoplasmic movement inside living plant cells (such as Elodea plants) is indicated by:
Movement of chloroplasts immersed in the cytoplasm stream in a constant rotational direction
Stomata open
Mitochondrial division
Change in cell wall thickness
4.
Cells that carry CD8 receptors and directly eliminate cancer cells, virus-infected cells, and transplanted organs are:
Cytotoxic T cells
Memory B cells
Helper T cells (Th)
Mast cells
5.
The number of hydrogen bonds between the nitrogenous base pair guanine and cytosine (G - C) is:
One bond
4 Links
3 Hydrogen bonds
Two hydrogen bonds
6.
Which of the following oxides is classified as an amphoteric oxide that reacts with both acids and bases to yield salt and water?
Carbon dioxide (CO2)
Sodium oxide (Na2O)
Aluminum oxide (Al2O3)
Sulfur trioxide (SO3)
7.
The movement of tension in the tendrils of climbing plants such as peas and grapes depends physiologically on:
Water loss through rapid transpiration
Secretion of gluey substances
Slow growth of the area in contact with the support and rapid growth of the area far from it as a result of the varying distribution of auxins
Degeneration of tendril cells
8.
A metal cation that forms a gelatinous white precipitate with NaOH which completely redissolves in excess reagent to form a soluble clear solution is:
Al3+ (due to the formation of soluble sodium meta-aluminate NaAlO2)
Fe3+
Ca2+
Fe2+
9.
The apple is considered a false fruit from a morphological and anatomical perspective because:
The edible, fatty part that is lubricated by food is the takht, not the ovary of the flower
The cup leaves become greasy
Produced from a hermaphrodite flower
It is made without seeds
10.
The adrenal medulla is stimulated to secrete the emergency hormones adrenaline and noradrenaline via:
ACTH hormonal stimulation
Body temperature change
Rapid and direct sympathetic nervous stimulation in cases of fear, fight, and flight
High blood sugar
11.
A segment of a DNA double helix consisting of 600 nucleotides. The number of complete turns in this segment is equal to:
60 roll
30 Full roll
10 Rolls
15 roll
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.
An aqueous solution of titanium(IV) chloride (TiCl4) is diamagnetic and colorless because:
Titanium is an alkali earth metal
It absorbs all visible wavelengths of light
The Ti4+ ion has an electronic configuration of [Ar] 3d0, devoid of unpaired d-electrons
Chlorine ions quench all magnetic dipoles
14.
The hormone responsible for the appearance of male secondary sexual characteristics, such as facial hair growth, deepening of the voice, and muscle building, is:
Testosterone
Progesterone
Estrogen
Growth hormone
15.
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:
9 Polar bodies (assuming division of the first polar body)
6 Polar bodies
12 A polar body
3 Polar bodies
16.
When severe dehydration and decreased blood volume and body fluids occur, which of the following hormonal changes occur?
The secretion of ADH and aldosterone increases to restore water and salts
Thyroxine secretion stops
ADH decreases and insulin increases
Calcitonin secretion increases
17.
The actual direct store of rapid energy in the muscle cell is:
Blood glucose
Muscle glycogen
ATP molecules
Fatty acids
18.
The gland that secretes both external ductal secretion and non-ductal hormonal secretion directly into the blood is:
pituitary gland
Thyroid gland
Adrenal gland
Pancreas (common/mixed gland)
19.
Which of the following hormones is secreted by the pituitary gland and indirectly affects basic metabolic processes and the speed of oxygen consumption?
Insulin hormone
Thyroid stimulating hormone (TSH).
The hormone oxytocin
ADH hormone
20.
The decisive experiment for Hershey and Chase (Hershey & Chase) To prove that DNA is the genetic material of bacteriophages, I relied on:
Radioactive phosphorus numbering P-32 in DNA and radioactive sulfur numbering S-35 in the protein envelope
Use of deoxyribonuclease enzyme to analyze protein
Radioactive nitrogen and carbon numbering
Isolation of bacterial plasmids
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