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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: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands

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  • Questions count: 20
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1.
In prokaryotic cells (such as bacteria), a single circular DNA molecule attaches to the plasma membrane at:
Nuclear envelope
Centrosome
One or more sites from which DNA replication begins
Ribosome
2.
The enzyme responsible for separating the two strands of DNA from each other by breaking hydrogen bonds during replication is:
Helicase enzyme
Palace enzyme
Ligase
DNA polymerase
3.
Acids are chemical compounds that dissociate in aqueous solutions to produce:
Sodium ions and chlorine gas
Precipitated metallic salts
Hydrogen ions (H+ or hydronium ions H3O+), turning blue litmus paper red
Hydroxide ions (OH-) turning red litmus paper blue
4.
Concentrated nitric acid (HNO3) induces chemical passivity on the surface of iron metal due to:
The instantaneous dissolution of iron into gaseous ions
The formation of an extremely thin, non-porous protective oxide film that halts further reaction
Complete neutralization of the acid
The precipitation of elemental sulfur on the surface
5.
The percentage of DNA encoding the construction of proteins and enzymes in the genetic content of eukaryotic cells (such as humans) represents approximately:
Less than 2% Of the total cell genome
50%
100%
More than 90%
6.
The reaction between an acid and a base to produce a salt and water is known as a:
Combustion reaction
Polymerization reaction
Thermal decomposition reaction
Neutralization reaction
7.
Plant hormones are responsible for the phenomenon of leaf fall and fruit ripening and falling. Where the role of a hormonal gas increases:
Ethylene gas
Abscisic acid
Gibberellic acid
Auxin IAA
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:
12 A polar body
9 Polar bodies (assuming division of the first polar body)
3 Polar bodies
6 Polar bodies
9.
Double fertilization in flowering plants involves two fusions:
The fusion of two pollen grains with one egg
Fusion of petals with sepals
Chromosome duplication in Takht cells
The fusion of the zygote nucleus (N) with the egg nucleus (N) to form the zygote (2N), and the fusion of the second nuclei (N) with the two polar nuclei (2N) to form the sperm nucleus.Dosperm (3N)
10.
Cultivation of plant tissues in a semi-natural nutrient medium (such as coconut milk) is scientific proof of:
Seeds are asexual
A complete living plant cell contains all the genetic information necessary to form a new complete plant
The necessity of double fertilization
Effect of thyroxine
11.
The covalent chemical bond that connects the heavy and light peptide chains in an antibody molecule is:
Weak hydrogen bonds
Ionic bonds
Disulfide Bonds - S-S
Additional peptide bonds
12.
Auxins in plants (such as indole acetic acid (IAA)) are chemicals secreted from:
Dead wood cells
The growing tops and live plant buds are active and move to the response areas
Cork cells
Pollen granules only
13.
Natural killer (NK) cells attack and kill cancer cells and virus-infected cells by:
Secretion of antibodies
Secretion of specialized digestive enzymes without the need for prior specific antigen recognition
Swallow the cells whole
Histamine secretion
14.
Artificial parthenogenesis in flowering plants (such as the production of seedless oranges or watermelons) is carried out by:
Irradiating seeds with X-rays
Spraying flower stigmas with pollen extract or indole acetic acid to stimulate the ovary to form fruit without fertilization
Pen vaccination
Tissue culture
15.
Mutations that are inherited to future generations and occur in reproductive cells that produce gametes are called:
Somatic mutations
Temporary spikes
Gamete mutations
Rebound mutations
16.
The sequence is repeated more than one hundred thousand times in the middle of one of the chromosomes of the Drosophila insect (fruit fly) and does not code for any protein:
AGACT
AUG
UAA
TATAAT
17.
The movement of hydrotropism in plant roots is considered tropism:
Positive (the root bends in the direction of moisture and water concentration)
Unaffected
Negatively
randomly
18.
The movement of tension in the tendrils of climbing plants such as peas and grapes depends physiologically on:
Secretion of gluey substances
Degeneration of tendril cells
Water loss through rapid transpiration
Slow growth of the area in contact with the support and rapid growth of the area far from it as a result of the varying distribution of auxins
19.
Which of the following organisms has its genetic material as a single molecule of RNA rather than DNA?
Escherichia coli bacteria
Bacteriophage T2
Human immunodeficiency virus (HIV), polio virus, influenza and coronavirus
Yeast
20.
Experiments using genes for resistance to insect pests in crop plants (such as the Bacillus thuringiensis gene) are an application to:
Artificial parthenogenesis
Parthenogenetic fruiting
Genetic engineering and development of genetically modified plants resistant to pests without chemical pesticides
Propagation by hydroponics
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