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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: Identification of DNA as Genetic Material

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  • Questions count: 20
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1.
Bacterial restriction endonucleases recognize specific nucleotide sequences called recognition sites, and are characterized by:
Asymmetric repetitive sequences
Palindromes of 4 to 8 pairs read in the same order on both strands in 5′ direction.' to 3'
Lipoprotein molecules
Stop codons only
2.
If y = (2x + 1) * (3x - 4), then dy/dx evaluated at x = 1 equals:
-5
12
1
7
3.
Connecting two complementary DNA strands by hydrogen bonds makes them:
connected by peptide bonds
criss-crossing each lap
Two exactly identical bars in the same direction
Two parallel strands in opposite directions that are chemically complementary
4.
In gene cloning technology, a ligase is used to:
Cut the plasmid
mRNA transcription
Breaking down proteins
Linking the integrated sticky ends of a target gene to the sticky ends of a circular plasmid
5.
The decisive experiment for Hershey and Chase (Hershey & Chase) To prove that DNA is the genetic material of bacteriophages, I relied on:
Radioactive phosphorus numbering P-32 in DNA and radioactive sulfur numbering S-35 in the protein envelope
Radioactive nitrogen and carbon numbering
Use of deoxyribonuclease enzyme to analyze protein
Isolation of bacterial plasmids
6.
Pure water reaches its maximum density (1.000 g/cm3 or 1000 kg/m3) at a temperature of:
4.0 °C
-4.0 °C
25.0 °C
0.0 °C
7.
What is the direct physiological effect of injecting a healthy person with an excessive dose of the hormone insulin?
A severe drop in blood glucose levels (hypoglycemia) and hypoglycemic coma
Increased urine secretion
Uric acid accumulation
A sharp increase in blood sugar
8.
The surface immune receptor characteristic of T helper cells (Th) that enables them to recognize the antigen complex with the MHC protein is:
CD3 receptor
CD8 receptor
CD4 receptor
BCR receptor
9.
The substance that the plant secretes to close wounds in its woody stems and completely isolate the affected tissue from the air and microbes is:
Liquid auxins
Monosaccharides
Gum and cork
Ascorbic acid
10.
In Griffith's bacterial transformation experiment, mice died when they were injected with:
A mixture of heat-killed S bacteria with live R bacteria
Heat-killed S bacteria alone
Live R bacteria alone
Sterile saline solution
11.
What is the structural characteristic of a restriction endonuclease recognition site?
It consists of 15-20 repetitive nucleotides.
It contains only adenine and thymine bases.
It is a palindromic sequence reading identical 5' to 3' on both strands.
It always begins with the start codon AUG.
12.
When dry chlorine gas is passed over red-hot iron filings, iron(III) chloride (FeCl3) is exclusively formed rather than iron(II) chloride because:
Iron(II) chloride spontaneously sublimes into thin air
The reaction occurs strictly in an alkaline medium
Chlorine cannot react with the inner 3d electrons
Chlorine gas is a powerful oxidizing agent that readily oxidizes any formed Fe2+ to Fe3+
13.
A person who skillfully makes beautiful objects by hand is called a/an ________.
artisan
engineer
scientist
pilot
14.
The antibody that is transferred across the placenta from the blood of the pregnant mother to the blood of the fetus to give it natural, passive, acquired immunity is:
IgG
IgD
IgE
IgM
15.
The enzyme extracted from RNA viruses and used to convert mRNA into a single strand of complementary DNA (cDNA) is:
Reverse transcriptase
Palace enzyme
RNA polymerase enzyme
Ligase enzyme
16.
The motile phase (motile zygote / ookinete) in the life cycle of Plasmodium malaria is characterized by:
It secretes malaria toxin
It is diploid (2N) and penetrates the mosquito's stomach wall and turns into an egg sac
Haploid group N
It attacks red blood cells
17.
Modifying enzymes produced by bacteria work to:
Cracking viruses
Cell wall construction
Sugar analysis
Adding methyl groups (-CH3) to the nucleotides of recognition sites in bacterial DNA to protect it from their shortening enzymes.
18.
The umbilical cord in the human fetus contains blood vessels that are characterized by:
Two arteries transport deoxygenated blood and waste from the fetus to the placenta, and one vein transports oxygenated blood and nutrients from the placenta to the fetus.
One artery and two veins
All its vessels carry oxygenated blood
Devoid of blood vessels
19.
The enzyme used in the crucial experiment to verify the experiments of Avery and his colleagues, which completely analyzes DNA and does not affect protein or RNA, is:
Deoxyribonuclease enzyme
DNA polymerase enzyme
pepsin enzyme
Ribonuclease enzyme
20.
Vaccination gives humans immunity:
Temporary negativity that disappears within weeks
Not specialized
Innate, inherited
Acquired long-term positivity for the formation of memory cells
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