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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: Movement in Plants and Muscle Contraction Mechanics in Humans

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  • Questions count: 20
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1.
The sum of the first n terms of an arithmetic sequence (S_n) is formulated as:
S_n = n / 2 * [ 2a + (n - 1) * d ] = n / 2 * [ a + l ]
S_n = a * (1 - rn) / (1 - r)
S_n = n * (a + d)
S_n = a / (1 - r)
2.
An ionic bond is formed primarily between:
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Positive metal ions immersed in a sea of delocalized electrons
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
3.
Nucleosome is structurally composed of:
Collagen proteins
An RNA molecule surrounded by myosin
A loop of DNA helix that wraps around a protein core made up of 8 histone molecules
A single strand of methylated DNA
4.
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)
5.
The sum to infinity (S_infinity) of a geometric series exists and converges if and only if the common ratio satisfies:
r > 1
|r| < 1 (i.e. -1 < r < 1), and S_infinity = a / (1 - r)
|r| >= 2
r = 1
6.
Telomeres are found at the ends of eukaryotic chromosomes and perform an important function in:
Synthesis of enzymes
Centromere doubling
Construction of ribosomes
Protecting chromosomes from corrosion and merging with each other and maintaining their structure
7.
The sum to infinity of the geometric series 12 + 6 + 3 + 1.5 + ... equals:
18
Infinity
36
24
8.
Which of the following immune structures represents the first line of defense in the human body to prevent the entry of pathogens?
Toxic T cells
Macrophages
Antibodies
Intact skin with its stratum corneum, mucus, HCl in the stomach, and saliva saturated with lysozyme
9.
The region in the sarcomere that contains both thin actin filaments and thick myosin filaments is:
Illuminated area (I)
Dark area (A)
Z line
Semi-luminous area (H)
10.
The maximum number of myofibrils that a muscle bundle consisting of 10 muscle fibers can contain is:
5,000 Fibrous
2,000 Fibrous
20,000 Myofibril
10,000 Fibrous
11.
The number of terms in the finite arithmetic sequence (5, 9, 13, ..., 81) is:
21 terms
19 terms
20 terms
25 terms
12.
The number of codons that code for the 20 amino acids in the genetic table is equal to:
64 Codona
20 Codona
32 Codona
61 Codons (out of a total of 64 codons after excluding the three stop codons)
13.
The equation of the tangent line to the curve y = x3 at the point (1, 1) is:
y = -3x + 4
y = x
y = 3x - 2
y = 3x + 1
14.
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
10 cm
8 cm
15.
In a hydraulic press, the ratio of the cross-sectional area of the large piston to that of the small piston is 50. If a force of 100 N is exerted on the small piston, the maximum force exerted by the large piston is:
5000 N
50,000 N
2500 N
2 N
16.
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 = 79
d = 3 and T_20 = 60
d = 5 and T_20 = 98
d = 4 and T_20 = 83
17.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
28%
22%
44%
56%
18.
The maximum number of pollen grains that can be produced from the anther of a flower containing 4 sacs, each sac with 20 germinal cells (2N) is:
160 grain
640 grain
80 grain
320 Pollen pill
19.
The number of sarcomeres in a muscle fiber containing 6 dark Z lines is:
6 to cut
12 piece
5 Muscle parts
7 to cut
20.
The sum to infinity of the geometric series 16 + 8 + 4 + 2 + ... equals:
32
24
30
64
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