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Biology & Geology

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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Quiz

Lesson 4 Quiz: Menstrual Cycle, Fertilization, Embryonic Development and Contraception

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1.
The slope of the tangent to the curve y = (x + 1)/(x - 1) at x = 2 is:
2
3
-2
-1
2.
The relative density (specific gravity) of a substance is defined as:
The product of density and the acceleration due to gravity
The reciprocal of the buoyant force
The ratio of the density of the substance to the density of pure water at 4°C
The mass of the substance divided by its volume at 100°C
3.
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)
Chromosome duplication in Takht cells
Fusion of petals with sepals
The fusion of two pollen grains with one egg
4.
Artificial parthenogenesis in flowering plants (such as the production of seedless oranges or watermelons) is carried out by:
Irradiating seeds with X-rays
Tissue culture
Pen vaccination
Spraying flower stigmas with pollen extract or indole acetic acid to stimulate the ovary to form fruit without fertilization
5.
Polyribosome is a vital cellular structure consisting of:
Fusion of two nuclei
Accumulated peripheral granules
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.
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