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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 4 Quiz: Menstrual Cycle, Fertilization, Embryonic Development and Contraception

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  • Questions count: 20
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1.
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
2.
Cells that carry CD8 receptors and directly eliminate cancer cells, virus-infected cells, and transplanted organs are:
Cytotoxic T cells
Mast cells
Memory B cells
Helper T cells (Th)
3.
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 = n * (a + d)
S_n = a / (1 - r)
S_n = n / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
4.
Cultivation of plant tissues in a semi-natural nutrient medium (such as coconut milk) is scientific proof of:
The necessity of double fertilization
Seeds are asexual
A complete living plant cell contains all the genetic information necessary to form a new complete plant
Effect of thyroxine
5.
Modifying enzymes produced by bacteria work to:
Sugar analysis
Adding methyl groups (-CH3) to the nucleotides of recognition sites in bacterial DNA to protect it from their shortening enzymes.
Cracking viruses
Cell wall construction
6.
The reaction between an acid and a base to produce a salt and water is known as a:
Combustion reaction
Neutralization reaction
Polymerization reaction
Thermal decomposition reaction
7.
A fixed quantity of an ideal gas has a volume of 600 cm3 at 27 °C. If the gas is heated to 127 °C under constant pressure, its new volume will be:
1200 cm3
900 cm3
700 cm3
800 cm3
8.
The lymphocytes responsible for secreting specific antibodies in humoral immunity are:
Helper T cells (TH)
Macrophages
Natural killer (NK) cells
Plasma B cells
9.
To distinguish between a white precipitate of barium sulfate (BaSO4) and a white precipitate of barium phosphate (Ba3(PO4)2), one should add:
Boiling distilled water
Ammonium hydroxide solution
Concentrated nitric acid in the dark
Dilute hydrochloric acid (Ba3(PO4)2 dissolves while BaSO4 remains insoluble)
10.
Interstitial cells in the human male testicle respond directly and secrete testosterone under the influence of a pituitary hormone:
Luteinizing hormone (LH)
Prolactin hormone
FSH hormone
Growth hormone
11.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = rho * g * h
P = 1/2 rho * g * h2
P = rho * h / g
P = rho * g / h
12.
A mercury manometer connected to a gas tank shows the mercury level in the free arm is 4 cm higher than the gas arm (Pa = 76 cm Hg). The gas pressure is:
72 cm Hg
76 cm Hg
4 cm Hg
80 cm Hg
13.
The sum to infinity of the geometric series 16 + 8 + 4 + 2 + ... equals:
30
24
64
32
14.
The lymphatic organ, which is called the graveyard of old and worn-out red blood cells and contains large numbers of macrophages, is:
Tonsils
appendix
Spleen
Thymus gland
15.
Immunoglobulin (antibody), which exists as a pentamer and contains 10 sites to bind to the antigen is:
IgG
IgM
IgE
IgA
16.
Plant hormones are responsible for the phenomenon of leaf fall and fruit ripening and falling. Where the role of a hormonal gas increases:
Auxin IAA
Ethylene gas
Abscisic acid
Gibberellic acid
17.
Absolute zero temperature (0 Kelvin or -273.15 °C) is defined physically as the theoretical temperature at which:
All liquids solidify into glass
Water reaches its maximum density
Atmospheric air completely combusts
The volume and pressure of an ideal gas theoretically extrapolate to zero and translational molecular motion reaches its quantum minimum
18.
The antibody that is transferred across the placenta from the blood of the pregnant mother to the blood of the fetus to give it natural, passive, acquired immunity is:
IgG
IgM
IgE
IgD
19.
Connecting two complementary DNA strands by hydrogen bonds makes them:
Two exactly identical bars in the same direction
criss-crossing each lap
Two parallel strands in opposite directions that are chemically complementary
connected by peptide bonds
20.
The 7th term of the geometric sequence (2, 6, 18, ...) is:
1458
162
486
729
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