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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 1 Quiz: Types of RNA, Genetic Code and Protein Translation

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  • Questions count: 20
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1.
The umbilical cord in the human fetus contains blood vessels that are characterized by:
One artery and two veins
Devoid of blood vessels
All its vessels carry oxygenated blood
Two arteries transport deoxygenated blood and waste from the fetus to the placenta, and one vein transports oxygenated blood and nutrients from the placenta to the fetus.
2.
Monocytes are functionally capable of leaving the bloodstream when needed:
Transformation into B cells
Transform into active macrophages to engulf microbes and cellular debris
Antibody formation
Histamine secretion
3.
When examining a patient who suffers from severe weight loss, bulging eyes, rapid heart rate, and high temperature, the doctor diagnoses the condition as:
Myxedema
Exophthalmos caused by excessive secretion of the hormone thyroxine
Diabetic urine
Dwarfism
4.
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:
10 cm
6.4 cm
12.5 cm
8 cm
5.
Sertoli cells in the seminiferous tubules of the human male testicle play a functional role in:
Secretion of testosterone
Meiosis to produce precursors
Excretion of fructose
The secretion of a fluid that nourishes sperm inside the testicle and is thought to have an immunological function
6.
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:
640 grain
320 Pollen pill
160 grain
80 grain
7.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Directly proportional to their densities
Equal regardless of the liquids used
Proportional to the square of the cross-sectional area of the tube
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
8.
The protein secreted by cytotoxic T cells (Tc) that creates holes in the plasma membrane of the target cell is:
Perforin protein
Complement C3
Interleukin
globulin
9.
If y = sin(3x) + cos(2x), then dy/dx at x = 0 equals:
3
1
5
-2
10.
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:
2500 N
50,000 N
5000 N
2 N
11.
Electric buses and monorails produce zero exhaust fumes, making them ________ forms of transport.
polluting
dangerous
noisy
eco-friendly
12.
Polyribosome is a vital cellular structure consisting of:
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
Fusion of two nuclei
Mitochondrial aggregation
13.
When dry chlorine gas is passed over red-hot iron filings, iron(III) chloride (FeCl3) is exclusively formed rather than iron(II) chloride because:
Iron(II) chloride spontaneously sublimes into thin air
The reaction occurs strictly in an alkaline medium
Chlorine gas is a powerful oxidizing agent that readily oxidizes any formed Fe2+ to Fe3+
Chlorine cannot react with the inner 3d electrons
14.
If y = (2x + 1) * (3x - 4), then dy/dx evaluated at x = 1 equals:
-5
7
1
12
15.
Combined contraceptive pills are considered an effective method because they:
The fallopian tubes close mechanically
Placental abruption
It kills sperm
It contains synthetic hormones similar to estrogen and progesterone that inhibit the secretion of FSH and LH from the pituitary, thus preventing the maturation of eggs and the occurrence of ovulation.
16.
In a hydraulic press, if the radius of the large piston is 4 times that of the small piston, the mechanical advantage is:
4
16
2
8
17.
In eukaryotic cells, rRNA molecules are synthesized and assembled under ribosomal subunits within:
Nucleolus
Golgi apparatus
directly into the cytoplasm
Smooth endoplasmic reticulum
18.
When a gas trapped inside a rigid container of fixed volume is heated from 27 °C (300 K) to 127 °C (400 K), its pressure increases by a factor of:
127 / 27
16 / 9
2 times
4 / 3 (since P1 / T1 = P2 / T2)
19.
A gas cylinder contains 10 liters of gas at a pressure of 3.0 atm. If the volume is reduced to 2.5 liters at constant temperature, the new pressure inside the cylinder will be:
12.0 atm
6.0 atm
1.2 atm
7.5 atm
20.
In Griffith's bacterial transformation experiment, mice died when they were injected with:
Live R bacteria alone
Sterile saline solution
Heat-killed S bacteria alone
A mixture of heat-killed S bacteria with live R bacteria
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