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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: Structure of Earth, Geological Time and Structural Geology

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  • Questions count: 20
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1.
Concentrated nitric acid (HNO3) induces chemical passivity on the surface of iron metal due to:
The instantaneous dissolution of iron into gaseous ions
Complete neutralization of the acid
The formation of an extremely thin, non-porous protective oxide film that halts further reaction
The precipitation of elemental sulfur on the surface
2.
Which of the following organisms has its genetic material as a single molecule of RNA rather than DNA?
Human immunodeficiency virus (HIV), polio virus, influenza and coronavirus
Bacteriophage T2
Yeast
Escherichia coli bacteria
3.
Natural killer (NK) cells attack and kill cancer cells and virus-infected cells by:
Secretion of specialized digestive enzymes without the need for prior specific antigen recognition
Swallow the cells whole
Histamine secretion
Secretion of antibodies
4.
Telomeres are found at the ends of eukaryotic chromosomes and perform an important function in:
Construction of ribosomes
Centromere doubling
Synthesis of enzymes
Protecting chromosomes from corrosion and merging with each other and maintaining their structure
5.
In prokaryotic cells (such as bacteria), a single circular DNA molecule attaches to the plasma membrane at:
Centrosome
Ribosome
Nuclear envelope
One or more sites from which DNA replication begins
6.
The global scientific project that was able to decipher and arrange more than 3 billion pairs of nitrogenous bases in human cells is:
Human Genome Project
Stem cell project
Acquired immunity project
Virus study project
7.
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
Propagation by hydroponics
Parthenogenetic fruiting
Artificial parthenogenesis
8.
The number of polar bodies resulting from the maturation and fertilization of 3 primary oocytes in the ovary of a human female is equal to:
6 Polar bodies
12 A polar body
3 Polar bodies
9 Polar bodies (assuming division of the first polar body)
9.
The percentage of DNA encoding the construction of proteins and enzymes in the genetic content of eukaryotic cells (such as humans) represents approximately:
More than 90%
Less than 2% Of the total cell genome
100%
50%
10.
The infective stage of the female Anopheles mosquito in the life cycle of Plasmodium malaria is:
Zygote
Gametocytes
Sporozoites
Merozoites
11.
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(II) sulfate and hydrogen gas only
Iron(III) sulfate only
Elemental iron and sulfur dioxide
12.
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
Use of deoxyribonuclease enzyme to analyze protein
Isolation of bacterial plasmids
13.
The main chemical reducing agent inside the Midrex furnace and its industrial source are respectively:
Water gas (mixture of CO and H2) produced from natural gas (methane CH4)
Pure carbon monoxide (CO) produced from metallurgical coke
Hydrogen gas produced from the electrolysis of water
Carbon dioxide mixed with limestone
14.
DNA Repair Enzymes, which number approximately 20 enzymes, depend for their work on:
Production of lipoproteins
Destruction of the infected cell
Heat irradiation of the cell
The presence of a corresponding healthy template strip complementary to the damaged strip to guide its sequence in repair
15.
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
Cortisol hormone
Aldosterone
Thyroxine hormone
16.
Common and economically beneficial chromosome duplication in the plant kingdom (such as strawberries, wheat, and apples) leads to:
Loss of chlorophyll
Root loss
Larger cells and tissues and larger, sweeter and more productive fruits
Plant sterility and death
17.
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
IgE
IgD
IgM
18.
DNA hybridization depends on the ability of single strands from different sources to combine if:
They contain complementary sequences of nitrogenous bases and are linked by hydrogen bonds
They are just the same height and weight
Made in the same cell
Treatment with shortening enzyme
19.
An aqueous solution of titanium(IV) chloride (TiCl4) is diamagnetic and colorless because:
Titanium is an alkali earth metal
Chlorine ions quench all magnetic dipoles
The Ti4+ ion has an electronic configuration of [Ar] 3d0, devoid of unpaired d-electrons
It absorbs all visible wavelengths of light
20.
The thermal multiplex device (PCR - Polymerase Chain Reaction) depends on an enzyme that tolerates high temperatures called:
Taq polymerase enzyme
RNA polymerase enzyme
Amylase enzyme
Human DNA polymerase enzyme
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