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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: 15
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1.
To distinguish between a white precipitate of barium sulfate (BaSO4) and a white precipitate of barium phosphate (Ba3(PO4)2), one should add:
Dilute hydrochloric acid (Ba3(PO4)2 dissolves while BaSO4 remains insoluble)
Concentrated nitric acid in the dark
Boiling distilled water
Ammonium hydroxide solution
2.
While the students ________ in the art workshop, the tour guide arrived.
worked
work
were working
are working
3.
If a, b, c form a geometric sequence of positive real numbers, the geometric mean b equals:
b = a * c
b = (a + c) / 2
b = + sqrt(a * c)
b = a2 + c2
4.
If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:
6
3
2
4
5.
If a particle moves along a straight line such that its position s(t) = t3 - 6 t2 + 9 t meters, the particle comes to an instantaneous rest (velocity v(t) = 0) at times:
t = 2 seconds and t = 4 seconds
t = 6 seconds
t = 0 seconds only
t = 1 second and t = 3 seconds
6.
A diver descends to a depth of 30 meters in seawater (density = 1030 kg/m3). If atmospheric pressure is 1.013 x 105 Pa and g = 9.8 m/s2, the total absolute pressure experienced by the diver is approximately:
4.04 x 105 Pa (approx. 4.0 atmospheres)
6.06 x 105 Pa
1.01 x 105 Pa
3.03 x 105 Pa
7.
The salivary glands and sweat glands in the human body are examples of:
Steroid tissue
Exocrine ductal glands discharge their secretions through special channels outside the bloodstream
Aductal endocrine glands
Common glands
8.
Substances secreted by T helper cells (Th) and acting as a communication tool to activate neighboring B and T cells are:
Hemoglobin
Antibodies
Interleukins
Myoglobin
9.
Natural killer (NK) cells attack and kill cancer cells and virus-infected cells by:
Secretion of specialized digestive enzymes without the need for prior specific antigen recognition
Histamine secretion
Swallow the cells whole
Secretion of antibodies
10.
Lymphotoxins secreted by cytotoxic T cells (Tc) eliminate the infected cell by:
Blood plasma coagulation
Immunosuppression
Calcium withdrawal
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).
11.
The phenomenon of natural parthenogenesis in honey bees results in:
Female workers only
Fertile queens (2N)
Diploid males
Bees are always male, and their somatic cells are haploid (1N) resulting from an unfertilized egg that grows mitotically.
12.
Double fertilization in flowering plants involves two fusions:
The fusion of the zygote nucleus (N) with the egg nucleus (N) to form the zygote (2N), and the fusion of the second nuclei (N) with the two polar nuclei (2N) to form the sperm nucleus.Dosperm (3N)
Fusion of petals with sepals
The fusion of two pollen grains with one egg
Chromosome duplication in Takht cells
13.
In the human female, the second (delayed/conditional) meiotic division of the secondary oocyte takes place in:
Graaf's vesicle
Ovaries before ovulation
The fallopian tube when the sperm enters the head for fertilization to occur
Uterine cavity
14.
Polyribosome is a vital cellular structure consisting of:
Mitochondrial aggregation
Accumulated peripheral granules
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.
Fusion of two nuclei
15.
In eukaryotic cells, rRNA molecules are synthesized and assembled under ribosomal subunits within:
directly into the cytoplasm
Smooth endoplasmic reticulum
Golgi apparatus
Nucleolus
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