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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: 11
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1.
In the arithmetic sequence (3, 7, 11, 15, ...), the common difference d and the 20th term (T_20) are respectively:
d = 4 and T_20 = 83
d = 5 and T_20 = 98
d = 3 and T_20 = 60
d = 4 and T_20 = 79
2.
The 7th term of the geometric sequence (2, 6, 18, ...) is:
729
162
1458
486
3.
The relative density (specific gravity) of a substance is defined as:
The ratio of the density of the substance to the density of pure water at 4°C
The mass of the substance divided by its volume at 100°C
The product of density and the acceleration due to gravity
The reciprocal of the buoyant force
4.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
Equal regardless of the liquids used
Proportional to the square of the cross-sectional area of the tube
Directly proportional to their densities
5.
A U-tube contains water (ρ = 1000 kg/m3) and oil (ρ = 800 kg/m3). If the oil column height above the interface is 10 cm, the balancing water column height is:
12.5 cm
6.4 cm
8 cm
10 cm
6.
The lymphocytes responsible for secreting specific antibodies in humoral immunity are:
Helper T cells (TH)
Macrophages
Natural killer (NK) cells
Plasma B cells
7.
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:
Alignment method
Decomposition method
Deposition method
Neutralization method
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 contraceptive method that prevents the fertilized egg from settling in the uterine lining without hindering the ovulation or fertilization processes is:
Condom
Contraceptive pills
IUD
Surgical ligation of the fallopian tubes
10.
The enzyme responsible for constructing an mRNA strand from one of the two DNA strands (template strand 3' to 5') he:
DNA polymerase enzyme
Palace enzyme
RNA polymerase
Binding enzyme
11.
The genetic code is characterized as universal because:
It consists of only two letters
It does not change with mutations
It is found in the nucleus only
The same codons code for the same amino acids in all organisms from bacteria to humans, confirming the common origin of life
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