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Biology & Geology

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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Quiz

Lesson 2 Quiz: Rock Cycle, Minerals, Crystallography and Weathering

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1.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
22%
56%
28%
44%
2.
The electronic configurations of both Chromium (24Cr) and Copper (29Cu) are anomalous due to the enhanced stability associated with:
Completely empty 4s subshells
Pairing of all electrons in the outer valence level
High electronegativity differences
Half-filled (3d5) and completely filled (3d10) d-subshells respectively
3.
The sum to infinity (S_infinity) of a geometric series exists and converges if and only if the common ratio satisfies:
|r| >= 2
|r| < 1 (i.e. -1 < r < 1), and S_infinity = a / (1 - r)
r > 1
r = 1
4.
Acids are chemical compounds that dissociate in aqueous solutions to produce:
Hydrogen ions (H+ or hydronium ions H3O+), turning blue litmus paper red
Precipitated metallic salts
Sodium ions and chlorine gas
Hydroxide ions (OH-) turning red litmus paper blue
5.
The chemical formula of aluminum sulfate is correctly written as:
Al2(SO4)3
AlSO4
Al3(SO4)2
Al(SO4)3
6.
The hormone that affects both glandular and non-glandular tissue in the adult female body is:
Aldosterone hormone
Growth hormone
Calcitonin hormone
Oxytocin
7.
The gland that secretes both external ductal secretion and non-ductal hormonal secretion directly into the blood is:
Pancreas (common/mixed gland)
Adrenal gland
Thyroid gland
pituitary gland
8.
The two hormones that are secreted from the mucous membrane of the small intestine to stimulate the pancreas to secrete its digestive juices are:
Prolactin and oxytocin
Secretin and cholecystokinin (Secretin & CCK)
Insulin and glucagon
Thyroxine and calcitonin
9.
The chemical compound secreted by mast cells and basal white blood cells that is responsible for the widening of blood vessels and symptoms of inflammation is:
Histamine
Albumin
Heparin
Interleukin
10.
The enzyme responsible for separating the two strands of DNA from each other by breaking hydrogen bonds during replication is:
Ligase
Palace enzyme
DNA polymerase
Helicase enzyme
11.
If a sample of a DNA double helix contains 30% Cytosine (C), the percentage of adenine (A) bases in this sample is equal to:
20%
40%
30%
70%
12.
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:
AUG
TATAAT
AGACT
UAA
13.
Common and economically beneficial chromosome duplication in the plant kingdom (such as strawberries, wheat, and apples) leads to:
Plant sterility and death
Loss of chlorophyll
Root loss
Larger cells and tissues and larger, sweeter and more productive fruits
14.
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%
More than 90%
100%
15.
The amount of DNA in a human female secondary oocyte compared to a resting somatic skin cell (before replication begins) is:
Equal (contains 46 DNA molecules in the form of 23 diploid chromosomes)
Weakness
Half the quantity
Quarter
16.
The global scientific project that was able to decipher and arrange more than 3 billion pairs of nitrogenous bases in human cells is:
Virus study project
Stem cell project
Acquired immunity project
Human Genome Project
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