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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 3 Quiz: Mechanism of the Immune System (Lines of Defense & Humoral/Cellular Immunity)

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  • Questions count: 16
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1.
When dry chlorine gas is passed over red-hot iron filings, iron(III) chloride (FeCl3) is exclusively formed rather than iron(II) chloride because:
Iron(II) chloride spontaneously sublimes into thin air
Chlorine gas is a powerful oxidizing agent that readily oxidizes any formed Fe2+ to Fe3+
The reaction occurs strictly in an alkaline medium
Chlorine cannot react with the inner 3d electrons
2.
An aqueous solution of titanium(IV) chloride (TiCl4) is diamagnetic and colorless because:
It absorbs all visible wavelengths of light
Chlorine ions quench all magnetic dipoles
Titanium is an alkali earth metal
The Ti4+ ion has an electronic configuration of [Ar] 3d0, devoid of unpaired d-electrons
3.
Pure water reaches its maximum density (1.000 g/cm3 or 1000 kg/m3) at a temperature of:
-4.0 °C
0.0 °C
4.0 °C
25.0 °C
4.
An ionic bond is formed primarily between:
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Positive metal ions immersed in a sea of delocalized electrons
5.
The pituitary gland is considered the master of the endocrine glands (the maestro) because:
The largest gland by weight
Connected to the liver
Secretes digestive enzymes
It secretes stimulating hormones that control the secretions of most other endocrine glands in the body, such as the thyroid, adrenals, and gonads
6.
When examining a patient who suffers from severe weight loss, bulging eyes, rapid heart rate, and high temperature, the doctor diagnoses the condition as:
Dwarfism
Diabetic urine
Myxedema
Exophthalmos caused by excessive secretion of the hormone thyroxine
7.
What is the direct physiological effect of injecting a healthy person with an excessive dose of the hormone insulin?
Uric acid accumulation
Increased urine secretion
A sharp increase in blood sugar
A severe drop in blood glucose levels (hypoglycemia) and hypoglycemic coma
8.
In the life cycle of the fougere plant (a fern), the haploid (N) gametophyte produces its male and female gametes by:
Surface budding
Regeneration
Mitosis within antheridia and archegonia
Direct meiosis
9.
The apple is considered a false fruit from a morphological and anatomical perspective because:
It is made without seeds
The cup leaves become greasy
Produced from a hermaphrodite flower
The edible, fatty part that is lubricated by food is the takht, not the ovary of the flower
10.
The hormone that is secreted from the corpus luteum and reaches its maximum concentration on days 21 to 23 of menstruation is:
Estrogen
LH hormone
FSH hormone
Progesterone
11.
In the life cycle of the Plasmodium malaria parasite, the human infective phase is:
Sporozoites
Gametophytes
Kinetic phase (okinete)
Merozoites
12.
The infective stage of the female Anopheles mosquito in the life cycle of Plasmodium malaria is:
Gametocytes
Merozoites
Sporozoites
Zygote
13.
The motile phase (motile zygote / ookinete) in the life cycle of Plasmodium malaria is characterized by:
It is diploid (2N) and penetrates the mosquito's stomach wall and turns into an egg sac
Haploid group N
It attacks red blood cells
It secretes malaria toxin
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:
AUG
TATAAT
AGACT
UAA
15.
The Ancon breed mutation in sheep with short, arched legs is considered a mutation:
Fatal to fetuses
A useful mechanism that the breeder kept in mind to prevent sheep from jumping fences and damaging crops
Harmful innovation
Numerical chromosome
16.
The genetic code is characterized as universal because:
The same codons code for the same amino acids in all organisms from bacteria to humans, confirming the common origin of life
It consists of only two letters
It is found in the nucleus only
It does not change with mutations
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