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Biology & Geology (STEM)

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: Identification of DNA as Genetic Material

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1.
STEM Endocrinology Question 5: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Cushing's syndrome from elevated cortisol
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Simple endemic goiter due to iodine deficiency
Myxedema resulting from severe hypothyroidism in adults
2.
STEM Geology Question 1: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
Strike-slip fault with purely horizontal displacement
Reverse fault caused by lateral compressional stress
3.
STEM Genetics Question 28: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
75 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
150 tRNA molecules
151 tRNA molecules
4.
STEM Geology Question 28: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Reverse fault caused by lateral compressional stress
Strike-slip fault with purely horizontal displacement
Thrust fault with an inclination angle less than 45 degrees
Normal fault resulting from crustal extensional (tensional) forces
5.
STEM Biology Problem 42: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
360 Cytosine bases and 1,560 total hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
6.
STEM Genetics Question 26: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
151 tRNA molecules
75 tRNA molecules
150 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
7.
STEM Endocrinology Question 19: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Simple endemic goiter due to iodine deficiency
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
8.
STEM Genetics Question 39: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
150 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
75 tRNA molecules
151 tRNA molecules
9.
STEM Geology Question 10: Which type of geological fault is formed when hanging-wall rocks slide downward relative to the footwall under tensional stress?
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
Reverse fault caused by lateral compressional stress
Strike-slip fault with purely horizontal displacement
10.
STEM Endocrinology Question 30: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Cushing's syndrome from elevated cortisol
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Simple endemic goiter due to iodine deficiency
Myxedema resulting from severe hypothyroidism in adults
11.
STEM Immunology Question 43: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Helper T-cells (CD4+ Th) exclusively
Plasma B-cells secreting IgG
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
12.
STEM Endocrinology Question 37: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Simple endemic goiter due to iodine deficiency
Cushing's syndrome from elevated cortisol
Myxedema resulting from severe hypothyroidism in adults
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
13.
STEM Genetics Question 31: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
151 tRNA molecules
75 tRNA molecules
150 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
14.
STEM Genetics Question 27: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
75 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
150 tRNA molecules
151 tRNA molecules
15.
STEM Biology Problem 7: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
16.
STEM Biology Problem 15: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
240 Cytosine bases and 1,200 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
17.
STEM Genetics Question 13: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
151 tRNA molecules
150 tRNA molecules
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
75 tRNA molecules
18.
STEM Genetics Question 9: What is the minimum number of tRNA anticodons required to translate an mRNA transcript containing 150 codons, terminating with a UAG stop codon?
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
75 tRNA molecules
151 tRNA molecules
150 tRNA molecules
19.
STEM Molecular Genetics Question 15: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They permanently destroy DNA ligase activity
They prevent plasmids from entering bacterial cells
They mutate bacterial resistance genes permanently
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
20.
STEM Molecular Genetics Question 16: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
They permanently destroy DNA ligase activity
They have single-stranded overhangs that readily form complementary hydrogen bonds with matching foreign DNA fragments
They mutate bacterial resistance genes permanently
They prevent plasmids from entering bacterial cells
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