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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: 15
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1.
The slope of the tangent line to the curve y = x2 - 6 x + 5 at the point (4, -3) equals:
m = 8
m = -2
m = 2
m = -3
2.
The equation of the tangent line to the curve y = x3 at the point (1, 1) is:
y = -3x + 4
y = x
y = 3x - 2
y = 3x + 1
3.
The density of an ideal gas at temperature T and pressure P is rho. If the pressure is tripled and the absolute temperature is halved, the new density becomes:
6 rho (since rho is proportional to P / T)
3 rho
0.67 rho
1.5 rho
4.
A metallic bond is physically described as the electrostatic attraction between:
Positive metal cations in the crystal lattice and the mobile sea of delocalized valence electrons
Dipole molecules in a polar liquid
Positive ions and negative non-metal anions
Protons and neutrons in the nucleus
5.
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:
Thyroxine hormone
Aldosterone
Cortisol hormone
Insulin hormone
6.
Beta cells in the islets of Langerhans in the pancreas are responsible for secreting the hormone:
Insulin
Somatostatin
Pepsin
Glucagon
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:
Histamine
Heparin
Albumin
Interleukin
8.
Substances secreted by T helper cells (Th) and acting as a communication tool to activate neighboring B and T cells are:
Myoglobin
Interleukins
Antibodies
Hemoglobin
9.
Lymphotoxins secreted by cytotoxic T cells (Tc) eliminate the infected cell by:
Calcium withdrawal
Activation of certain genes within the nucleus of the infected cell, which leads to the fragmentation of its genetic material and its programmed death (Apoptosis).
Blood plasma coagulation
Immunosuppression
10.
The umbilical cord in the human fetus contains blood vessels that are characterized by:
One artery and two veins
Devoid of blood vessels
Two arteries transport deoxygenated blood and waste from the fetus to the placenta, and one vein transports oxygenated blood and nutrients from the placenta to the fetus.
All its vessels carry oxygenated blood
11.
According to Chargaff's rules's Rules) In the DNA double helix, the equal ratio is always:
A = G And T = C
The ratio of adenine A equals thymine T, and the ratio of guanine G equals cytosine C (A+G). = T+C)
A / T = 2
A + T = G + C always
12.
A chemical substance used in the laboratory to cause mutations and chromosome duplication in the growing tips of plants is:
Hyaluronic acid
Glycerin
Colchicine, mustard gas, or nitrous acid
Sucrose solution
13.
The amount of DNA in a human female secondary oocyte compared to a resting somatic skin cell (before replication begins) is:
Equal (contains 46 DNA molecules in the form of 23 diploid chromosomes)
Half the quantity
Weakness
Quarter
14.
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:
Protecting the mRNA molecule from degradation by enzymes in the cytoplasm
Binding to the polymerase enzyme
Encoding polar amino acids
Formation of the nuclear envelope
15.
The two main functional sites on the tRNA molecule are:
Start location and stop location
Phosphate site and sugar site
DNA polymerase site and binding site
The amino acid binding site is at the 3′ end' (sequence CCA), and anticodon site
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