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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: The Human Immune System (Organs, Cells, and Antibodies)

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  • Questions count: 20
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1.
Plant hormones are responsible for the phenomenon of leaf fall and fruit ripening and falling. Where the role of a hormonal gas increases:
Abscisic acid
Auxin IAA
Ethylene gas
Gibberellic acid
2.
The sum of the first n terms of an arithmetic sequence (S_n) is formulated as:
S_n = a * (1 - rn) / (1 - r)
S_n = a / (1 - r)
S_n = n * (a + d)
S_n = n / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
3.
Interstitial cells in the human male testicle respond directly and secrete testosterone under the influence of a pituitary hormone:
Luteinizing hormone (LH)
FSH hormone
Prolactin hormone
Growth hormone
4.
The motile phase (motile zygote / ookinete) in the life cycle of Plasmodium malaria is characterized by:
It attacks red blood cells
It secretes malaria toxin
Haploid group N
It is diploid (2N) and penetrates the mosquito's stomach wall and turns into an egg sac
5.
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
Radioactive nitrogen and carbon numbering
Isolation of bacterial plasmids
Use of deoxyribonuclease enzyme to analyze protein
6.
Which of the following compounds exhibits polar covalent bonding due to a significant difference in electronegativity between 0.4 and 1.7?
Sodium chloride (NaCl)
Water (H2O)
Methane (CH4)
Chlorine gas (Cl2)
7.
The chemical compound secreted by mast cells and basal white blood cells that is responsible for the widening of blood vessels and symptoms of inflammation is:
Interleukin
Albumin
Histamine
Heparin
8.
The ion directly responsible for the explosion of synaptic vesicles and the release of acetylcholine in the neuromuscular synapse cleft is:
Sodium ion Na+
Chloride ion Cl−
Calcium ion Ca2+
Potassium ion K+
9.
The derivative of f(x) = 4 x3 - 5 x2 + 7 x - 9 with respect to x is:
f'(x) = 4 x2 - 5 x + 7
f'(x) = 12 x3 - 10 x2 + 7
f'(x) = 12 x2 - 10 x + 7
f'(x) = 12 x2 - 10 x
10.
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:
Binding to the polymerase enzyme
Formation of the nuclear envelope
Encoding polar amino acids
Protecting the mRNA molecule from degradation by enzymes in the cytoplasm
11.
Pure water reaches its maximum density (1.000 g/cm3 or 1000 kg/m3) at a temperature of:
0.0 °C
-4.0 °C
25.0 °C
4.0 °C
12.
The hormone responsible for maintaining the balance of minerals in the blood by stimulating the reabsorption of sodium ions and eliminating excess potassium through the kidneys is:
Insulin hormone
Thyroxine hormone
Aldosterone
Cortisol hormone
13.
The phenomenon of natural parthenogenesis in honey bees results in:
Diploid males
Bees are always male, and their somatic cells are haploid (1N) resulting from an unfertilized egg that grows mitotically.
Female workers only
Fertile queens (2N)
14.
Pascal's principle states that when pressure is applied to an enclosed, incompressible fluid, it is transmitted:
Only downwards towards the bottom of the vessel
With an exponential decay as distance increases
Strictly to compressible gases
Undiminished to every portion of the fluid and to the walls of the containing vessel
15.
Phenolphthalein indicator cannot distinguish between an acidic solution and a neutral solution because:
It is blue in both
It precipitates in both
It is red in both
It is colorless in both
16.
Peyer's spots's Patches) Tiny lymph nodes spread in the mucous membrane lining the:
Lower part of the small intestine (ileum)
Stomach
esophagus
Pharynx
17.
Magnetic iron oxide (Magnetite, Fe3O4) is chemically considered a mixed oxide because reacting it with hot concentrated sulfuric acid yields:
A mixture of iron(II) sulfate, iron(III) sulfate, and water vapor
Elemental iron and sulfur dioxide
Iron(III) sulfate only
Iron(II) sulfate and hydrogen gas only
18.
The universal gas constant R in SI units has the numerical value and dimensions of:
8.314 J / (mol . K)
1.38 x 10−23 Pa . m3
6.022 x 1023 J / K
0.0821 J / mol
19.
The Ancon breed mutation in sheep with short, arched legs is considered a mutation:
A useful mechanism that the breeder kept in mind to prevent sheep from jumping fences and damaging crops
Numerical chromosome
Fatal to fetuses
Harmful innovation
20.
Real gases behave most closely to an ideal gas under conditions of:
Extremely high pressure and low temperature
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
Zero gravitational acceleration
High pressure and near liquefaction point
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