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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: Plant Immunity (Structural and Biochemical Defense)

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  • Questions count: 20
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1.
A metal cation that forms a gelatinous white precipitate with NaOH which completely redissolves in excess reagent to form a soluble clear solution is:
Ca2+
Al3+ (due to the formation of soluble sodium meta-aluminate NaAlO2)
Fe2+
Fe3+
2.
A transition element whose +5 oxidation state compound (V2O5) is widely utilized as an industrial catalyst in the Contact Process for sulfuric acid manufacturing and as a colorant in ceramics is:
Vanadium (23V)
Manganese (25Mn)
Scandium (21Sc)
Cobalt (27Co)
3.
The percentage of DNA encoding the construction of proteins and enzymes in the genetic content of eukaryotic cells (such as humans) represents approximately:
50%
More than 90%
Less than 2% Of the total cell genome
100%
4.
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
ADH hormone
The hormone oxytocin
Thyroid stimulating hormone (TSH).
5.
The nitrogen molecule (N2) contains a:
Single ionic bond
Double covalent bond
Coordinate dative bond
Triple covalent bond (one sigma bond and two pi bonds) sharing 3 electron pairs
6.
The number of codons that code for the 20 amino acids in the genetic table is equal to:
64 Codona
32 Codona
20 Codona
61 Codons (out of a total of 64 codons after excluding the three stop codons)
7.
A hormone secreted from the anterior lobe of the pituitary gland that stimulates the growth of Graafian follicles in the female ovary and the production of sperm in the male testicle is:
follicle stimulating hormone (FSH)
Prolactin hormone
Luteinizing hormone (LH)
ACTH hormone
8.
The protein secreted by cytotoxic T cells (Tc) that creates holes in the plasma membrane of the target cell is:
Perforin protein
Complement C3
globulin
Interleukin
9.
Immunoglobulin (antibody), which exists as a pentamer and contains 10 sites to bind to the antigen is:
IgA
IgE
IgM
IgG
10.
In a titration experiment, 20.0 mL of 0.15 M H2SO4 is completely neutralized by 30.0 mL of NaOH solution. The molar concentration of the NaOH solution is:
0.10 M
0.05 M
0.30 M
0.20 M
11.
Which of the following solutions has the lowest pH value (strongest acidity) at equal concentration?
NaCl
CH3COOH
HCl
NH4OH
12.
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
Iron(III) sulfate only
Elemental iron and sulfur dioxide
Iron(II) sulfate and hydrogen gas only
13.
Combined contraceptive pills are considered an effective method because they:
It kills sperm
It contains synthetic hormones similar to estrogen and progesterone that inhibit the secretion of FSH and LH from the pituitary, thus preventing the maturation of eggs and the occurrence of ovulation.
Placental abruption
The fallopian tubes close mechanically
14.
Immune chemicals secreted by virus-infected cells to warn neighboring healthy cells to produce enzymes that inhibit virus replication.S is:
Chemokines
Interferons
Complements
Interleukins
15.
The sum to infinity (S_infinity) of a geometric series exists and converges if and only if the common ratio satisfies:
r > 1
|r| >= 2
r = 1
|r| < 1 (i.e. -1 < r < 1), and S_infinity = a / (1 - r)
16.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
The water temperature at the surface is near absolute zero
The bubble absorbs water molecules into its gas phase
Atmospheric pressure increases at the surface
The hydrostatic pressure decreases as depth decreases, allowing the trapped air to expand according to Boyle's law
17.
Concentrated nitric acid (HNO3) induces chemical passivity on the surface of iron metal due to:
The precipitation of elemental sulfur on the surface
Complete neutralization of the acid
The instantaneous dissolution of iron into gaseous ions
The formation of an extremely thin, non-porous protective oxide film that halts further reaction
18.
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
19.
Which of the following conditions leads to increased secretion of parathormone from the parathyroid glands?
High blood calcium level
Low phosphate
Low level of ionized calcium in blood plasma
Excessive vitamin D excess
20.
Plant hypersensitivity is an effective immunological method that includes:
Stomata open at night
The plant kills some of its infected tissues and cells locally to prevent the spread of the microbe to healthy tissues
Secreting nectar to attract bees
Root loss
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