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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: Adrenal Glands, The Pancreas and Reproductive Gonads

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  • Questions count: 5
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1.
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 sudden increase in atomic mass
The identical number of neutrons in their nuclei
Decreasing ionization energies
2.
A metallic cube of side length 10 cm and density 7800 kg/m3 is completely submerged in water (density 1000 kg/m3). The buoyant force (upthrust) acting on the cube is (g = 10 m/s2):
78 N
10 N
100 N
68 N
3.
An ionic bond is formed primarily between:
Positive metal ions immersed in a sea of delocalized electrons
Noble gas atoms at very low temperatures
Two non-metal atoms sharing pairs of valence electrons equally
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
4.
A solution with a pH value of 3.0 is classified as:
Weakly basic
Strongly alkaline
Strongly acidic
Neutral
5.
The standard start codon in an mRNA molecule recognized by the first tRNA molecule carrying methionine is:
AUG
UAA
UAG
UGA
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