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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 3 Quiz: Mechanism of the Immune System (Lines of Defense & Humoral/Cellular Immunity)

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  • Questions count: 20
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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 = 3 and T_20 = 60
d = 5 and T_20 = 98
d = 4 and T_20 = 79
d = 4 and T_20 = 83
2.
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)
3.
The enzyme responsible for constructing an mRNA strand from one of the two DNA strands (template strand 3' to 5') he:
RNA polymerase
Palace enzyme
Binding enzyme
DNA polymerase enzyme
4.
The number of codons that code for the 20 amino acids in the genetic table is equal to:
20 Codona
32 Codona
64 Codona
61 Codons (out of a total of 64 codons after excluding the three stop codons)
5.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Work done by the large piston / Work done on the small piston > 1
Force on the large piston / Force on the small piston (F / f)
Area of the large piston / Area of the small piston (A / a)
Distance moved by the small piston / Distance moved by the large piston (y1 / y2)
6.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
22%
56%
44%
28%
7.
Which of the following alloys is classified as an interstitial alloy?
Duralumin (Aluminum and Copper)
Stainless steel (Iron, Chromium, and Nickel)
Carbon steel (Iron and Carbon where small carbon atoms occupy interstitial voids)
Brass (Copper and Zinc)
8.
Interstitial cells in the human male testicle respond directly and secrete testosterone under the influence of a pituitary hormone:
FSH hormone
Growth hormone
Prolactin hormone
Luteinizing hormone (LH)
9.
The sum of the first 10 terms of the geometric sequence 2, 6, 18, 54, ... equals:
118,096
29,524
59,048
19,682
10.
The polyadenyne tail (Poly-A Tail) added to the end of the mRNA molecule in eukaryotes consists of about 200 adenine nucleotides and functionally functions to:
Protecting the mRNA molecule from degradation by enzymes in the cytoplasm
Binding to the polymerase enzyme
Encoding polar amino acids
Formation of the nuclear envelope
11.
The second derivative d2y/dx2 of the function y = x4 - 2 x3 + 5 is:
12 x2 - 12 x
4 x3 - 6 x2
24 x - 12
12 x2 - 6 x
12.
The enzyme found in the apical body (Acrosome) of the sperm that helps it penetrate the compact envelope of the egg is:
Hyaluronidase enzyme
pepsin enzyme
Cholinesterase enzyme
Amylase enzyme
13.
DNA polymerase always adds new nucleotides in a specific direction:
From party 5' To party 3' For new growing bar only
randomly
In both directions together
From party 3' to 5' only
14.
If a sample of a DNA double helix contains 30% Cytosine (C), the percentage of adenine (A) bases in this sample is equal to:
20%
30%
40%
70%
15.
Polyribosome is a vital cellular structure consisting of:
Fusion of two nuclei
Mitochondrial aggregation
A large number of ribosomes (up to 100 ribosomes) attach to a single mRNA molecule to translate it simultaneously and quickly build many copies of the protein.
Accumulated peripheral granules
16.
The enzyme that catalyzes the peptidyl transferase reaction and the formation of the peptide bond between amino acids during translation is:
Part of the rRNA molecule that makes up the subunit of the ribosomal subunit
Helix enzyme
Release factor protein
DNA polymerase enzyme
17.
The n-th term of an arithmetic sequence with first term a and common difference d is given by:
T_n = a * rn − 1
T_n = a + n * d
T_n = 1/2 n (2a + d)
T_n = a + (n - 1) * d
18.
The enzyme responsible for separating the two strands of DNA from each other by breaking hydrogen bonds during replication is:
DNA polymerase
Ligase
Palace enzyme
Helicase enzyme
19.
The equation of the tangent line to the curve y = x3 at the point (1, 1) is:
y = 3x + 1
y = x
y = 3x - 2
y = -3x + 4
20.
Which of the following hormones is considered a steroid hormone (derived from fat and cholesterol)?
Growth hormone (GH)
Insulin
Progesterone and testosterone
Thyroxine
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