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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 1 Quiz: Plant Immunity (Structural and Biochemical Defense)

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  • Questions count: 20
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1.
Which of the following first-row transition metal ions exhibits the highest theoretical magnetic moment in its ground state?
Fe3+ ([Ar] 3d5 with 5 unpaired electrons)
Cr3+ ([Ar] 3d3 with 3 unpaired electrons)
Cu2+ ([Ar] 3d9 with 1 unpaired electron)
Zn2+ ([Ar] 3d10 with 0 unpaired electrons)
2.
The n-th term of an arithmetic sequence with first term a and common difference d is given by:
T_n = a + (n - 1) * d
T_n = a + n * d
T_n = a * rn − 1
T_n = 1/2 n (2a + d)
3.
The sum of the first n terms of an arithmetic sequence (S_n) is formulated as:
S_n = n * (a + d)
S_n = a / (1 - r)
S_n = a * (1 - rn) / (1 - r)
S_n = n / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
4.
The sum of the first 10 terms of the geometric sequence 2, 6, 18, 54, ... equals:
19,682
59,048
29,524
118,096
5.
The chemical formula of aluminum sulfate is correctly written as:
Al2(SO4)3
Al(SO4)3
Al3(SO4)2
AlSO4
6.
Antidiuretic hormone (ADH/vasopressin) works to raise blood pressure by:
Expansion of the arteries
Stimulate sweat
Smooth blood vessel constriction and water reabsorption in nephrons
Sodium excretion in urine
7.
The salivary glands and sweat glands in the human body are examples of:
Exocrine ductal glands discharge their secretions through special channels outside the bloodstream
Aductal endocrine glands
Common glands
Steroid tissue
8.
The covalent chemical bond that connects the heavy and light peptide chains in an antibody molecule is:
Additional peptide bonds
Weak hydrogen bonds
Disulfide Bonds - S-S
Ionic bonds
9.
The lymphatic organ, which is called the graveyard of old and worn-out red blood cells and contains large numbers of macrophages, is:
Thymus gland
Spleen
appendix
Tonsils
10.
The method of action of antibodies that is considered the most appropriate and most efficient in inactivating viruses and preventing their penetration into cells is:
Neutralization method
Alignment method
Deposition method
Decomposition method
11.
Which of the following immune structures represents the first line of defense in the human body to prevent the entry of pathogens?
Intact skin with its stratum corneum, mucus, HCl in the stomach, and saliva saturated with lysozyme
Macrophages
Antibodies
Toxic T cells
12.
The enzyme found in the apical body (Acrosome) of the sperm that helps it penetrate the compact envelope of the egg is:
Cholinesterase enzyme
pepsin enzyme
Hyaluronidase enzyme
Amylase enzyme
13.
The contraceptive method that prevents the fertilized egg from settling in the uterine lining without hindering the ovulation or fertilization processes is:
Condom
Surgical ligation of the fallopian tubes
Contraceptive pills
IUD
14.
Sertoli cells in the seminiferous tubules of the human male testicle play a functional role in:
Secretion of testosterone
Excretion of fructose
The secretion of a fluid that nourishes sperm inside the testicle and is thought to have an immunological function
Meiosis to produce precursors
15.
In the human female, the second (delayed/conditional) meiotic division of the secondary oocyte takes place in:
Uterine cavity
The fallopian tube when the sperm enters the head for fertilization to occur
Ovaries before ovulation
Graaf's vesicle
16.
Hydra and planaria share the ability to reproduce asexually by:
Budding only
Bacteria formation
Regeneration
Longitudinal binary fission
17.
Which of the following organisms has its genetic material as a single molecule of RNA rather than DNA?
Escherichia coli bacteria
Bacteriophage T2
Yeast
Human immunodeficiency virus (HIV), polio virus, influenza and coronavirus
18.
DNA hybridization depends on the ability of single strands from different sources to combine if:
They are just the same height and weight
Treatment with shortening enzyme
They contain complementary sequences of nitrogenous bases and are linked by hydrogen bonds
Made in the same cell
19.
The first human protein produced commercially using recombinant DNA technology to treat diabetics is:
Hemoglobin
Human hormone insulin (Insulin)
Growth hormone
Interferon protein
20.
In eukaryotic cells, rRNA molecules are synthesized and assembled under ribosomal subunits within:
Nucleolus
Smooth endoplasmic reticulum
Golgi apparatus
directly into the cytoplasm
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