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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: Identification of DNA as Genetic Material

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  • Questions count: 20
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1.
A transition element whose +5 oxidation state compound (V2O5) is widely utilized as an industrial catalyst in the Contact Process for sulfuric acid manufacturing and as a colorant in ceramics is:
Scandium (21Sc)
Vanadium (23V)
Cobalt (27Co)
Manganese (25Mn)
2.
What is the structural characteristic of a restriction endonuclease recognition site?
It consists of 15-20 repetitive nucleotides.
It contains only adenine and thymine bases.
It is a palindromic sequence reading identical 5' to 3' on both strands.
It always begins with the start codon AUG.
3.
An aqueous solution of titanium(IV) chloride (TiCl4) is diamagnetic and colorless because:
It absorbs all visible wavelengths of light
Chlorine ions quench all magnetic dipoles
The Ti4+ ion has an electronic configuration of [Ar] 3d0, devoid of unpaired d-electrons
Titanium is an alkali earth metal
4.
In prokaryotic cells (such as bacteria), a single circular DNA molecule attaches to the plasma membrane at:
Nuclear envelope
Ribosome
Centrosome
One or more sites from which DNA replication begins
5.
The derivative of y = sin(3x) with respect to x is:
-3 cos(3x)
3 sin(3x)
cos(3x)
3 cos(3x)
6.
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:
1.6 atm
1.2 atm
2.4 atm
0.96 atm
7.
An ionic bond is formed primarily between:
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
Positive metal ions immersed in a sea of delocalized electrons
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
8.
Hydra and planaria share the ability to reproduce asexually by:
Longitudinal binary fission
Budding only
Regeneration
Bacteria formation
9.
A chemical substance used in the laboratory to cause mutations and chromosome duplication in the growing tips of plants is:
Sucrose solution
Hyaluronic acid
Colchicine, mustard gas, or nitrous acid
Glycerin
10.
Party 3' For a DNA strand that ends with a group:
Free hydroxyl (-OH)
Free phosphate (-PO4)
Free amine (-NH2)
Free carboxylate (-COOH)
11.
When examining a patient who suffers from severe weight loss, bulging eyes, rapid heart rate, and high temperature, the doctor diagnoses the condition as:
Exophthalmos caused by excessive secretion of the hormone thyroxine
Dwarfism
Diabetic urine
Myxedema
12.
The universal gas constant R in SI units has the numerical value and dimensions of:
0.0821 J / mol
6.022 x 1023 J / K
1.38 x 10−23 Pa . m3
8.314 J / (mol . K)
13.
The derivative of f(x) = 4 x3 - 5 x2 + 7 x - 9 with respect to x is:
f'(x) = 12 x3 - 10 x2 + 7
f'(x) = 12 x2 - 10 x
f'(x) = 12 x2 - 10 x + 7
f'(x) = 4 x2 - 5 x + 7
14.
What is the direct physiological effect of injecting a healthy person with an excessive dose of the hormone insulin?
A severe drop in blood glucose levels (hypoglycemia) and hypoglycemic coma
Increased urine secretion
Uric acid accumulation
A sharp increase in blood sugar
15.
A segment of a DNA double helix consisting of 600 nucleotides. The number of complete turns in this segment is equal to:
10 Rolls
30 Full roll
60 roll
15 roll
16.
The decomposition of the corpus luteum in the ovary of a non-pregnant woman at the end of the menstrual cycle results in:
A sharp drop in the concentration of the hormone progesterone leads to the breakdown of the uterine lining, the rupture of its capillaries, and the occurrence of menstruation
Placenta formation
Secretion of huge amounts of LH
Continued growth of the uterine lining
17.
The atomic radii of the elements from Chromium to Copper remain remarkably steady and nearly constant across the first transition series because of:
The mutual compensation between the increasing nuclear charge and the repulsive forces among accumulated 3d electrons
The identical number of neutrons in their nuclei
The sudden increase in atomic mass
Decreasing ionization energies
18.
When a gas trapped inside a rigid container of fixed volume is heated from 27 °C (300 K) to 127 °C (400 K), its pressure increases by a factor of:
127 / 27
4 / 3 (since P1 / T1 = P2 / T2)
16 / 9
2 times
19.
The maximum number of pollen grains that can be produced from the anther of a flower containing 4 sacs, each sac with 20 germinal cells (2N) is:
320 Pollen pill
640 grain
80 grain
160 grain
20.
The equation of the tangent line to the curve y = x3 at the point (1, 1) is:
y = -3x + 4
y = x
y = 3x + 1
y = 3x - 2
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