Curriculum
Login

Curriculum

Biology & Geology (STEM)

Chapter 2 - Hormonal Coordination in Living Organisms

0/32

Chapter 3 - Reproduction in Living Organisms

0/33

Chapter 4 - Immunity in Living Organisms

0/34

Chapter 5 - Molecular Biology - DNA Structure and Function

0/37

Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

0/38
Quiz

Lesson 1 Quiz: Plant Immunity (Structural and Biochemical Defense)

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
1.
STEM Genetics Question 43: 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
2.
STEM Biology Problem 31: 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
3.
STEM Immunology Question 41: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Plasma B-cells secreting IgG
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Helper T-cells (CD4+ Th) exclusively
4.
STEM Biology Problem 10: 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
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
5.
STEM Endocrinology Question 13: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Myxedema resulting from severe hypothyroidism in adults
Simple endemic goiter due to iodine deficiency
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
Cushing's syndrome from elevated cortisol
6.
STEM Immunology Question 9: 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
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Plasma B-cells secreting IgG
7.
STEM Endocrinology Question 25: A patient suffers from increased metabolic rate, weight loss, nervousness, and protruding eyes (exophthalmos). Which endocrine condition is most likely diagnosed?
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Simple endemic goiter due to iodine deficiency
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
8.
STEM Molecular Genetics Question 17: Why are sticky ends produced by restriction endonucleases essential for constructing recombinant DNA plasmids?
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
They permanently destroy DNA ligase activity
9.
STEM Genetics Question 34: 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)
151 tRNA molecules
150 tRNA molecules
75 tRNA molecules
10.
STEM Ecology Question 8: In an arid desert ecosystem, what morphological adaptation enables xerophytic plants like Acacia and Opuntia to survive severe water scarcity?
Extensive deep or horizontal root systems, thick waxy cutin layers, and sunken stomata
Rapid continuous transpiration during midday heat
Absence of xylem vessels and thin cellulose walls
Broad thin leaves with dense stomata on both surfaces
11.
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?
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
151 tRNA molecules
75 tRNA molecules
150 tRNA molecules
12.
STEM Biology Problem 21: 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
120 Cytosine bases and 960 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
13.
STEM Immunology Question 2: Which immune cells are directly responsible for secreting perforin proteins and granzymes to lyse virally infected cells and tumor cells?
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Helper T-cells (CD4+ Th) exclusively
Plasma B-cells secreting IgG
14.
STEM Geology Question 9: 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
Normal fault resulting from crustal extensional (tensional) forces
Thrust fault with an inclination angle less than 45 degrees
15.
STEM Immunology Question 36: 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
Mast cells releasing histamine
Cytotoxic T-cells (CD8+ Tc) and Natural Killer (NK) cells
Plasma B-cells secreting IgG
16.
STEM Endocrinology Question 29: 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
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Exophthalmic goiter (Hyperthyroidism caused by excessive thyroxine secretion)
17.
STEM Ecology Question 29: In an arid desert ecosystem, what morphological adaptation enables xerophytic plants like Acacia and Opuntia to survive severe water scarcity?
Broad thin leaves with dense stomata on both surfaces
Rapid continuous transpiration during midday heat
Extensive deep or horizontal root systems, thick waxy cutin layers, and sunken stomata
Absence of xylem vessels and thin cellulose walls
18.
STEM Endocrinology Question 24: 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)
Myxedema resulting from severe hypothyroidism in adults
Cushing's syndrome from elevated cortisol
Simple endemic goiter due to iodine deficiency
19.
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
120 Cytosine bases and 960 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
20.
STEM Genetics Question 2: 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
149 tRNA molecules (stop codons do not code for amino acids or tRNAs)
150 tRNA molecules
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20