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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 1 Quiz: Support in Plants and the Human Skeletal System

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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%
28%
56%
44%
2.
The nitrogen molecule (N2) contains a:
Triple covalent bond (one sigma bond and two pi bonds) sharing 3 electron pairs
Double covalent bond
Coordinate dative bond
Single ionic bond
3.
The chemical formula of aluminum sulfate is correctly written as:
AlSO4
Al(SO4)3
Al2(SO4)3
Al3(SO4)2
4.
Immunoglobulin (antibody), which exists as a pentamer and contains 10 sites to bind to the antigen is:
IgM
IgE
IgA
IgG
5.
The phenomenon of natural parthenogenesis in honey bees results in:
Female workers only
Diploid males
Bees are always male, and their somatic cells are haploid (1N) resulting from an unfertilized egg that grows mitotically.
Fertile queens (2N)
6.
The umbilical cord in the human fetus contains blood vessels that are characterized by:
Two arteries transport deoxygenated blood and waste from the fetus to the placenta, and one vein transports oxygenated blood and nutrients from the placenta to the fetus.
All its vessels carry oxygenated blood
Devoid of blood vessels
One artery and two veins
7.
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%
70%
30%
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