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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: DNA Structure, Replication and DNA Repair Enzymes

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  • Questions count: 20
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1.
Modifying enzymes produced by bacteria work to:
Cracking viruses
Sugar analysis
Adding methyl groups (-CH3) to the nucleotides of recognition sites in bacterial DNA to protect it from their shortening enzymes.
Cell wall construction
2.
In the secondary immune response upon exposure to the microbe for the second time, the response is characterized as:
Limited to non-specialized immunity
It is very rapid and produces huge amounts of antibodies thanks to memory cells, and the individual does not show symptoms of the disease
Slow and takes days
Rely only on the first line of defense
3.
Bacterial restriction endonucleases recognize specific nucleotide sequences called recognition sites, and are characterized by:
Asymmetric repetitive sequences
Stop codons only
Lipoprotein molecules
Palindromes of 4 to 8 pairs read in the same order on both strands in 5′ direction.' to 3'
4.
The sequence is repeated more than one hundred thousand times in the middle of one of the chromosomes of the Drosophila insect (fruit fly) and does not code for any protein:
TATAAT
UAA
AUG
AGACT
5.
Party 3' For a DNA strand that ends with a group:
Free hydroxyl (-OH)
Free amine (-NH2)
Free carboxylate (-COOH)
Free phosphate (-PO4)
6.
Connecting two complementary DNA strands by hydrogen bonds makes them:
Two exactly identical bars in the same direction
criss-crossing each lap
Two parallel strands in opposite directions that are chemically complementary
connected by peptide bonds
7.
Plant hypersensitivity is an effective immunological method that includes:
The plant kills some of its infected tissues and cells locally to prevent the spread of the microbe to healthy tissues
Root loss
Stomata open at night
Secreting nectar to attract bees
8.
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).
Immunosuppression
Calcium withdrawal
Blood plasma coagulation
9.
The lymphatic organ, which is called the graveyard of old and worn-out red blood cells and contains large numbers of macrophages, is:
Tonsils
appendix
Spleen
Thymus gland
10.
The amount of DNA in a human female secondary oocyte compared to a resting somatic skin cell (before replication begins) is:
Half the quantity
Weakness
Quarter
Equal (contains 46 DNA molecules in the form of 23 diploid chromosomes)
11.
When dilute hydrochloric acid is added to a solid salt, a gas is evolved with a pungent odor that turns acidified potassium dichromate paper green while a colloidal yellow precipitate of sulfur separates in the reaction vessel. The anion is:
Sulfite (SO32−)
Sulfide (S2−)
Sulfate (SO42−)
Thiosulfate (S2O32−)
12.
Phenolphthalein indicator cannot distinguish between an acidic solution and a neutral solution because:
It is red in both
It is colorless in both
It is blue in both
It precipitates in both
13.
The chemical compound secreted by mast cells and basal white blood cells that is responsible for the widening of blood vessels and symptoms of inflammation is:
Interleukin
Albumin
Histamine
Heparin
14.
In Griffith's bacterial transformation experiment, mice died when they were injected with:
A mixture of heat-killed S bacteria with live R bacteria
Sterile saline solution
Heat-killed S bacteria alone
Live R bacteria alone
15.
The common ratio r of the geometric sequence (64, 32, 16, 8, ...) is:
r = 2
r = -1/2
r = 4
r = 1/2
16.
If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:
4
3
6
2
17.
Which of the following amino acids is considered a non-protein acid produced by plants as protective and toxic substances for microorganisms?
Glycine and alanine
Valine and leucine
Methionine and tryptophan
Canavanine and cephalosporin
18.
The enzyme found in the apical body (Acrosome) of the sperm that helps it penetrate the compact envelope of the egg is:
Cholinesterase enzyme
Amylase enzyme
pepsin enzyme
Hyaluronidase enzyme
19.
The hormone that is secreted from the corpus luteum and reaches its maximum concentration on days 21 to 23 of menstruation is:
Progesterone
Estrogen
FSH hormone
LH hormone
20.
The universal gas constant R in SI units has the numerical value and dimensions of:
6.022 x 1023 J / K
0.0821 J / mol
8.314 J / (mol . K)
1.38 x 10−23 Pa . m3
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