Match the following terms and definitions. 1.the smallest unit of an element atom 2.the path surrounding the nucleus of an atom in which electrons are normally located molecule 3.the number of protons in the nucleus of the atom proton 4.a pure substance where atoms of two or more elements are chemically bonded to one another shell 5.the positively charged center of an atom nucleus 6.exists in orbit around the nucleus of an atom and carries a negative charge neutron 7.the smallest unit of a pure substance that consists of two or more atoms held together by a chemical bond electron 8.the mass of an element diatomic 9.a subatomic particle that carries no charge compound 10.containing two atoms atomic number 11.a subatomic particle with a positive charge atomic mass
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Biology, 22.06.2019 06:30
1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.
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Biology, 22.06.2019 13:00
Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?
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Match the following terms and definitions. 1.the smallest unit of an element atom 2.the path surroun...
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