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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: The Human Immune System (Organs, Cells, and Antibodies)

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  • Questions count: 12
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1.
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 ]
2.
The sum of the first 10 terms of the geometric sequence 2, 6, 18, 54, ... equals:
19,682
59,048
29,524
118,096
3.
The slope of the tangent to the curve y = (x + 1)/(x - 1) at x = 2 is:
3
-2
2
-1
4.
If the tangent to y = x2 - 4x + 5 is parallel to the x-axis, the point of tangency is:
(0, 5)
(2, 0)
(2, 1)
(4, 5)
5.
If both the absolute temperature and the absolute pressure of a confined ideal gas are doubled, the volume of the gas:
Decreases to one-fourth
Doubles to twice its original volume
Remains constant and unchanged
Quadruples
6.
The density of an ideal gas at temperature T and pressure P is rho. If the pressure is tripled and the absolute temperature is halved, the new density becomes:
3 rho
0.67 rho
6 rho (since rho is proportional to P / T)
1.5 rho
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.
The motile phase (motile zygote / ookinete) in the life cycle of Plasmodium malaria is characterized by:
It attacks red blood cells
It secretes malaria toxin
Haploid group N
It is diploid (2N) and penetrates the mosquito's stomach wall and turns into an egg sac
9.
According to Chargaff's rules's Rules) In the DNA double helix, the equal ratio is always:
The ratio of adenine A equals thymine T, and the ratio of guanine G equals cytosine C (A+G). = T+C)
A / T = 2
A + T = G + C always
A = G And T = C
10.
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
11.
The standard start codon in an mRNA molecule recognized by the first tRNA molecule carrying methionine is:
UGA
AUG
UAA
UAG
12.
The first human protein produced commercially using recombinant DNA technology to treat diabetics is:
Human hormone insulin (Insulin)
Hemoglobin
Interferon protein
Growth hormone
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