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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: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands

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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:
Manganese (25Mn)
Cobalt (27Co)
Vanadium (23V)
Scandium (21Sc)
2.
A metal cation that forms a gelatinous white precipitate with NaOH which completely redissolves in excess reagent to form a soluble clear solution is:
Fe2+
Ca2+
Fe3+
Al3+ (due to the formation of soluble sodium meta-aluminate NaAlO2)
3.
If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:
4
3
6
2
4.
Absolute zero temperature (0 Kelvin or -273.15 °C) is defined physically as the theoretical temperature at which:
All liquids solidify into glass
The volume and pressure of an ideal gas theoretically extrapolate to zero and translational molecular motion reaches its quantum minimum
Atmospheric air completely combusts
Water reaches its maximum density
5.
Immune chemicals secreted by virus-infected cells to warn neighboring healthy cells to produce enzymes that inhibit virus replication.S is:
Interleukins
Complements
Chemokines
Interferons
6.
The outer embryonic membrane that surrounds the uterine membrane and from which digital villi emerge, which are immersed in the uterine lining to form the placenta, is:
Amniotic membrane (Chorion)
umbilical cord
Corpus luteum
Sagging membrane
7.
A segment of a DNA double helix consisting of 600 nucleotides. The number of complete turns in this segment is equal to:
30 Full roll
15 roll
10 Rolls
60 roll
8.
The enzyme that catalyzes the peptidyl transferase reaction and the formation of the peptide bond between amino acids during translation is:
Part of the rRNA molecule that makes up the subunit of the ribosomal subunit
DNA polymerase enzyme
Release factor protein
Helix enzyme
9.
The number of amino acid molecules in a polypeptide chain resulting from mRNA translation consisting of 303 nucleotides, including the start and stop codons, is equal to:
300 Acid
99 Acid
101 Acid
100 Amino acid
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