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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: Rock Cycle, Minerals, Crystallography and Weathering

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  • Questions count: 20
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1.
Cells that carry CD8 receptors and directly eliminate cancer cells, virus-infected cells, and transplanted organs are:
Helper T cells (Th)
Cytotoxic T cells
Mast cells
Memory B cells
2.
The pituitary gland is considered the master of the endocrine glands (the maestro) because:
Secretes digestive enzymes
Connected to the liver
The largest gland by weight
It secretes stimulating hormones that control the secretions of most other endocrine glands in the body, such as the thyroid, adrenals, and gonads
3.
Peyer's spots's Patches) Tiny lymph nodes spread in the mucous membrane lining the:
esophagus
Pharynx
Stomach
Lower part of the small intestine (ileum)
4.
An aqueous solution of titanium(IV) chloride (TiCl4) is diamagnetic and colorless because:
The Ti4+ ion has an electronic configuration of [Ar] 3d0, devoid of unpaired d-electrons
Chlorine ions quench all magnetic dipoles
Titanium is an alkali earth metal
It absorbs all visible wavelengths of light
5.
The apple is considered a false fruit from a morphological and anatomical perspective because:
It is made without seeds
Produced from a hermaphrodite flower
The cup leaves become greasy
The edible, fatty part that is lubricated by food is the takht, not the ovary of the flower
6.
The genetic code is characterized as universal because:
The same codons code for the same amino acids in all organisms from bacteria to humans, confirming the common origin of life
It consists of only two letters
It is found in the nucleus only
It does not change with mutations
7.
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
8.
The ion directly responsible for the explosion of synaptic vesicles and the release of acetylcholine in the neuromuscular synapse cleft is:
Calcium ion Ca2+
Potassium ion K+
Chloride ion Cl−
Sodium ion Na+
9.
The motile phase (motile zygote / ookinete) in the life cycle of Plasmodium malaria is characterized by:
It is diploid (2N) and penetrates the mosquito's stomach wall and turns into an egg sac
Haploid group N
It attacks red blood cells
It secretes malaria toxin
10.
The volume expansion coefficient at constant pressure (alpha_v) of an ideal gas is physically measured using:
Joly's bulb apparatus or Charles's apparatus with a dry mercury droplet index
A torsion balance
A hydrometer
A venturi meter and manometer
11.
Sticky Ends resulting from the action of shortening enzymes are characterized by:
Short, extended single strands of unpaired nucleotides capable of spontaneous association with complementary ends
Ends surrounded by peptide bonds
Inactive phosphate sequences
Collagen thickened ends
12.
A metallic bond is physically described as the electrostatic attraction between:
Positive ions and negative non-metal anions
Protons and neutrons in the nucleus
Positive metal cations in the crystal lattice and the mobile sea of delocalized valence electrons
Dipole molecules in a polar liquid
13.
Sertoli cells in the seminiferous tubules of the human male testicle play a functional role in:
Secretion of testosterone
Excretion of fructose
The secretion of a fluid that nourishes sperm inside the testicle and is thought to have an immunological function
Meiosis to produce precursors
14.
The atomic radii of the elements from Chromium to Copper remain remarkably steady and nearly constant across the first transition series because of:
The identical number of neutrons in their nuclei
Decreasing ionization energies
The sudden increase in atomic mass
The mutual compensation between the increasing nuclear charge and the repulsive forces among accumulated 3d electrons
15.
DNA hybridization depends on the ability of single strands from different sources to combine if:
Treatment with shortening enzyme
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
16.
Boyle's Law states that for a fixed mass of an ideal gas kept at constant temperature, the volume V is:
Directly proportional to absolute temperature
Directly proportional to pressure
Inversely proportional to its absolute pressure P (P1 * V1 = P2 * V2)
Independent of pressure changes
17.
The first human protein produced commercially using recombinant DNA technology to treat diabetics is:
Hemoglobin
Human hormone insulin (Insulin)
Growth hormone
Interferon protein
18.
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 / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
S_n = a / (1 - r)
S_n = n * (a + d)
19.
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
800 cm3
700 cm3
20.
What is the structural characteristic of a restriction endonuclease recognition site?
It contains only adenine and thymine bases.
It is a palindromic sequence reading identical 5' to 3' on both strands.
It consists of 15-20 repetitive nucleotides.
It always begins with the start codon AUG.
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