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All living things have their own lifecycle, depending on various contributing factors. The life span of an unfertilized egg is about 24 hours (a day). Prior to this time, an egg is released by the ovary every month and is…
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The nucleosome is the simplest structural unit of DNA packing, and the core is made up of proteins. The nucleosome core is made up of 8 different histone proteins, arranged in different patterns, around which Aa DNA segment is wrapped…
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The cardiac cycle is made up of 4 different stages through which blood flows to and from the heart. Each stage is characterized by movements of the tissues of the heart either in the opening, filling, closing, or emptying the…
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During the Cold War (1945), Richard Nixon, the 37th president of the United States thought of a strategic way to reduce the damage the United States suffered through the war, and he created a doctrine to that effect. The Nixon…
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Depending on the location or type, each human cell has a specific number of chromosomes. Generally, humans are known to have a diploid number of chromosomes (46), except the gametes (23 chromosomes). All somatic cells are strictly diploid, and so…
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Mammals are distinct animals that possess backbones, a constantly warm internal temperature, hairs, or furs on their skins, have 4 chambered hearts, and feed their young with milk. These characteristics however are not all entirely unique to mammals, as other…
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The sun is a giant ball of gasses that is in constant motion, and it produces energy through the process of nuclear fusion. Here, two protons (hydrogen atoms) moving at very high speeds collide with each other, forming a helium…
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While it is commonly believed that the more complex an organism, the more complex the arrangement or organization of internal organs, earthworms are different. Though not as complex as humans, an earthworm has five different hearts. The hearts, however, referred…
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When light travels through a medium or from one medium to another, its direction is bound to change, and this change is what forms the basis for the difference between reflection and refraction. Reflection occurs when the light returns back…
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Going by the word "poly" meaning "many" or "numerous", a polyatomic ion refers to an ion that is made up of at least two atoms. The atoms on a polyatomic ion are most often bound by covalent bonds, and based…
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Renewable resources refer to the kind of natural resources that can be naturally replenished at a reasonable rate when compared to the rate at which it is being used. A limited resource or nonrenewable resource, however, is a kind of…
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The cells of living organisms are made up of large molecules that are responsible for their overall structure and functioning. These large molecules are referred to as biological molecules or macromolecules, and each macromolecule is made up of its own…
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The electromagnetic spectrum comprises all the ranges of wavelengths of every electromagnetic radiation or electromagnetic wave. The waves are arranged in order of frequencies and wavelengths. The waves are microwaves, radio waves, x-rays, visible light, ultraviolet, infrared, and gamma rays.…
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The centromere refers to the dense region in a DNA sequence in the chromosome, usually found either in the middle or near the middle of a chromosome. It is the region in mitosis, where the microtubule spindles connect through the…
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Answer: D. Interior Narrative. How a person truly feels about an event is usually demonstrated through the person’s interior narrative. Interior narrative refers to the act of personal brainstorming or self-reflection about a particular sequence of events. This is usually…
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Answer: A. U.S. Sailors had been briefly arrested. Explanation: In an incident known as the "Dolphin incident", the U.S. President, Wilson, claimed that the Victoriano Huerta led administration allowed the arrest of some U.S. sailors while they were on an…
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Answer: C. Immigration Act. Explanation: The Great Society program was created to mitigate the problems of racial injustice and poverty. During this time, projects were centered around providing good education, transportation, medical services, etc. The Immigration Act was enacted in…
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Answer: B. Vitamin C. Explanation: vitamins in our diet are classified into two groups: fat soluble vitamins (A, D, E, and K), and water soluble vitamins (B and C). Fat soluble vitamins dissolve in fat and are transferred for storage.…
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Answer: b. Genomic library. Explanation: A genomic library is a combination of cloned fragments of DNA, which serve as representatives for the entirety of the genome of a particular entity. In simpler terms, the genomic library serves as a collection…
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Answer: C. Cornea. Explanation: In the human eye, most refraction occurs when light passes through the cornea, as the cornea is the first medium through which light travels before it travels further into the eye. The cornea is the curved,…
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Answer: 2. CaO (s) + CO2 (g) → CaCO3 (s) and 4. PbCO3 (s) → PbO (s) + CO2 (g) In (2), limestone is decomposed under heating to give rise to quicklime and CO2, while (4), is the thermal decomposition…
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Irrespective of its state, blood is referred to as a connective tissue because it has qualities of connective tissues. For example, blood comprises cells, a non-fluid matrix (plasma), and fibers -three basic properties of connective tissues. Also, like connective tissues,…
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Axons are nerve fibers that are long and slender and are projected from a nerve cell, and function as conductors of impulses outwards from the cell body to a synapse. Dendrites are slender projections of nerve cells that function as…
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Kinetics refers to the science of deciphering the reason behind the types of motion, while kinematics refers to the science of understanding and explaining how objects move, with respect to, acceleration, position, etc. In kinetics, the cause of motion is…
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Muscle cells have a large number of mitochondria cells. The reason for this is that muscle cells demand a very high amount of energy to support the movement, exercise, and other metabolic processes. To meet up this demand, the mitochondria…
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Answer: 5. Aluminum. Explanation: The ionization energy of an atom is the amount of energy required to remove an electron from a mole of atoms while in the gas phase. The second ionization energy is the energy required to remove a second electron, to…
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Even though acids and bases are fundamentally different in nature, there are some similarities between them. For example, both acids and bases cause a chemical reaction when applied to litmus paper -acid changes blue litmus paper to red, while bases…
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Answer: A. Periods. Explanation: The periodic table is divided into rows and columns. The rows run across the table from one end to the other and are called periods. The columns run from the top of the periodic table to…
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Answer: D. Conservation of energy. Explanation: The first law of thermodynamics states that energy (matter) can neither be created nor destroyed, but can be converted from one form to another. This means that regardless of the physical or chemical processes…
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Answer: C. Tertiary structure. Explanation: The overall three-dimensional folded structure of a polypeptide is referred to as the tertiary structure. The structure is due to the relationship between the R-groups of the amino acids that constitute the building blocks of…
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