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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: Reproduction in Flowering Plants (Angiosperms)

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  • Questions count: 20
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1.
A chemical substance used in the laboratory to cause mutations and chromosome duplication in the growing tips of plants is:
Colchicine, mustard gas, or nitrous acid
Hyaluronic acid
Sucrose solution
Glycerin
2.
Which of the following immune structures represents the first line of defense in the human body to prevent the entry of pathogens?
Antibodies
Macrophages
Toxic T cells
Intact skin with its stratum corneum, mucus, HCl in the stomach, and saliva saturated with lysozyme
3.
The surface immune receptor characteristic of T helper cells (Th) that enables them to recognize the antigen complex with the MHC protein is:
CD3 receptor
CD8 receptor
CD4 receptor
BCR receptor
4.
If a, b, c form a geometric sequence of positive real numbers, the geometric mean b equals:
b = (a + c) / 2
b = a2 + c2
b = a * c
b = + sqrt(a * c)
5.
Absolute zero temperature (0 Kelvin or -273.15 °C) is defined physically as the theoretical temperature at which:
All liquids solidify into glass
Atmospheric air completely combusts
Water reaches its maximum density
The volume and pressure of an ideal gas theoretically extrapolate to zero and translational molecular motion reaches its quantum minimum
6.
Complements are a group of plasma proteins that activate when an antibody binds to an antigen and work to:
Histamine secretion
Activate viruses
Blood clotting
Decomposing the antigenic envelope and dissolving its contents to facilitate their ingestion by macrophages
7.
Which of the following alloys is classified as an interstitial alloy?
Duralumin (Aluminum and Copper)
Brass (Copper and Zinc)
Stainless steel (Iron, Chromium, and Nickel)
Carbon steel (Iron and Carbon where small carbon atoms occupy interstitial voids)
8.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
22%
56%
28%
44%
9.
The number of hydrogen bonds between the nitrogenous base pair guanine and cytosine (G - C) is:
One bond
4 Links
3 Hydrogen bonds
Two hydrogen bonds
10.
Sticky Ends resulting from the action of shortening enzymes are characterized by:
Ends surrounded by peptide bonds
Short, extended single strands of unpaired nucleotides capable of spontaneous association with complementary ends
Collagen thickened ends
Inactive phosphate sequences
11.
The substance that the plant secretes to close wounds in its woody stems and completely isolate the affected tissue from the air and microbes is:
Liquid auxins
Monosaccharides
Gum and cork
Ascorbic acid
12.
Experiments using genes for resistance to insect pests in crop plants (such as the Bacillus thuringiensis gene) are an application to:
Genetic engineering and development of genetically modified plants resistant to pests without chemical pesticides
Parthenogenetic fruiting
Propagation by hydroponics
Artificial parthenogenesis
13.
Which of the following solutions has the lowest pH value (strongest acidity) at equal concentration?
NaCl
CH3COOH
HCl
NH4OH
14.
Potters use high-temperature ovens called ________ to bake and harden clay vessels.
fridges
blenders
kilns
looms
15.
A segment of a DNA double helix consisting of 600 nucleotides. The number of complete turns in this segment is equal to:
60 roll
30 Full roll
10 Rolls
15 roll
16.
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:
0.30 M
0.05 M
0.10 M
0.20 M
17.
Reproduction by peaceful association in two adjacent threads of the spirogyra moss (Rem al-Barak) occurs in the case of:
Abundance of pure fresh water
Complete darkness
The environment is exposed to drought, change in water purity, or change in temperature (unsuitable conditions)
Mild spring
18.
If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:
6
2
4
3
19.
The pressure of a gas trapped inside an incandescent light bulb is 0.8 atm at room temperature (27 °C). When the bulb operates, the filament heats the gas to 327 °C at constant volume. The operational pressure is:
0.96 atm
1.6 atm
2.4 atm
1.2 atm
20.
A person who skillfully makes beautiful objects by hand is called a/an ________.
engineer
artisan
pilot
scientist
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