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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: Recombinant DNA, Gene Cloning, PCR and Genetic Engineering

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  • Questions count: 20
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1.
The protein secreted by cytotoxic T cells (Tc) that creates holes in the plasma membrane of the target cell is:
Interleukin
Complement C3
globulin
Perforin protein
2.
Lymphotoxins secreted by cytotoxic T cells (Tc) eliminate the infected cell by:
Activation of certain genes within the nucleus of the infected cell, which leads to the fragmentation of its genetic material and its programmed death (Apoptosis).
Blood plasma coagulation
Immunosuppression
Calcium withdrawal
3.
Sertoli cells in the seminiferous tubules of the human male testicle play a functional role in:
The secretion of a fluid that nourishes sperm inside the testicle and is thought to have an immunological function
Meiosis to produce precursors
Secretion of testosterone
Excretion of fructose
4.
Monocytes are functionally capable of leaving the bloodstream when needed:
Transform into active macrophages to engulf microbes and cellular debris
Histamine secretion
Antibody formation
Transformation into B cells
5.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Area of the large piston / Area of the small piston (A / a)
Distance moved by the small piston / Distance moved by the large piston (y1 / y2)
Force on the large piston / Force on the small piston (F / f)
Work done by the large piston / Work done on the small piston > 1
6.
The sum of the first n terms of an arithmetic sequence (S_n) is formulated as:
S_n = a * (1 - rn) / (1 - r)
S_n = a / (1 - r)
S_n = n * (a + d)
S_n = n / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
7.
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:
Vanadium (23V)
Scandium (21Sc)
Manganese (25Mn)
Cobalt (27Co)
8.
Auxins in plants (such as indole acetic acid (IAA)) are chemicals secreted from:
Pollen granules only
Cork cells
The growing tops and live plant buds are active and move to the response areas
Dead wood cells
9.
The genetic code is characterized as universal because:
It consists of only two letters
The same codons code for the same amino acids in all organisms from bacteria to humans, confirming the common origin of life
It does not change with mutations
It is found in the nucleus only
10.
In the life cycle of the fougere plant (a fern), the haploid (N) gametophyte produces its male and female gametes by:
Direct meiosis
Surface budding
Regeneration
Mitosis within antheridia and archegonia
11.
Artificial parthenogenesis in flowering plants (such as the production of seedless oranges or watermelons) is carried out by:
Irradiating seeds with X-rays
Pen vaccination
Spraying flower stigmas with pollen extract or indole acetic acid to stimulate the ovary to form fruit without fertilization
Tissue culture
12.
The hormone that affects both glandular and non-glandular tissue in the adult female body is:
Aldosterone hormone
Growth hormone
Oxytocin
Calcitonin hormone
13.
The number of codons that code for the 20 amino acids in the genetic table is equal to:
61 Codons (out of a total of 64 codons after excluding the three stop codons)
32 Codona
20 Codona
64 Codona
14.
Histone proteins responsible for shortening the length of the DNA molecule ten times and forming nucleosomes are characterized by being rich in the two basic amino acids:
Glycine and alanine
Glutamic acid and aspartic acid
Methionine and tryptophan
Arginine and lysine (Arginine & Lysine)
15.
The cells that suppress and inhibit the immune response after eliminating the microbe and secrete lymphokine proteins are:
Helper T cells (Th)
Neutrophil cells
Suppressor T cells
Plasma cells
16.
Which of the following hormones is secreted by the pituitary gland and indirectly affects basic metabolic processes and the speed of oxygen consumption?
ADH hormone
The hormone oxytocin
Thyroid stimulating hormone (TSH).
Insulin hormone
17.
The Ancon breed mutation in sheep with short, arched legs is considered a mutation:
Numerical chromosome
Harmful innovation
A useful mechanism that the breeder kept in mind to prevent sheep from jumping fences and damaging crops
Fatal to fetuses
18.
If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:
4
2
6
3
19.
The polyadenyne tail (Poly-A Tail) added to the end of the mRNA molecule in eukaryotes consists of about 200 adenine nucleotides and functionally functions to:
Encoding polar amino acids
Formation of the nuclear envelope
Protecting the mRNA molecule from degradation by enzymes in the cytoplasm
Binding to the polymerase enzyme
20.
The decisive experiment for Hershey and Chase (Hershey & Chase) To prove that DNA is the genetic material of bacteriophages, I relied on:
Radioactive nitrogen and carbon numbering
Use of deoxyribonuclease enzyme to analyze protein
Radioactive phosphorus numbering P-32 in DNA and radioactive sulfur numbering S-35 in the protein envelope
Isolation of bacterial plasmids
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