Biology Key Questions Essay - 675 Words

Biology Key Questions – Lesson #1 1. How many electrons does Mg2+ have? Answer: Mg2+ has 10 electrons. A Magnesium atom has 12 electrons, 2 of which are valence electrons. The atom will lose the 2 outermost electrons in order to stabilize its electron shell. The nucleus maintains its 12 protons and becomes a Mg2+ ion. 2. Given that the half-life of the radioisotope carbon-14 is 5730 years, how useful do you think this isotope would be for dating bones that are over a million years old? Answer: Carbon-14 is incorporated in the tissues of plants and animals through their environment. When they die the incorporation of carbon-14 ends, and what remains in the specimen decays at a constant rate, with a half-life of†¦show more content†¦When the two smaller reactants join together, water is produced and removed during the synthesis of the larger molecule. This is also called Dehydration Synthesis. For example, molecules with projecting Hydrogen atoms bond with molecules with projecting Hydroxyl groups (-OH), forming water. The water molecule then leaves the reactants, allowing them to bond to form a larger, more complex molecule. This type of reaction occurs continuously throughout the body in the joining of amino acids to form protein. Amino acid + Amino acid ïÆ'   Protein + Water Oxidation and Reduction (Redox) A chemical reaction involving the transfer of electrons rather than molecules is classified as a Redox reaction. A reaction involving the loss of electrons is called Oxidation, and a reaction involving the gain of electrons is called Reduction. Oxidation and Reduction always occur together, as one reactant loses electrons, and the other gains them. This exchange often effects the physical states of molecules, as their solubility is changed with their charge. *Zn(s) + Cu2+ ïÆ'   Cu(s) + Zn2+(aq) Cellular respiration is a redox reaction that combines glucose oxygen to produce carbon dioxide, water, and energy. Neutralization: Neutralization reactions are those that involve the reaction of an acid and a base to form water and salt. A solution with a high hydrogen ion concentration is acidic, and a solution with a high concentration of hydroxide ions isShow MoreRelatedUnit 1 Lesson 1 Key Question Biology SBI4U Essay1283 Words   |  6 Pagesï » ¿Unit 1 Lesson 1 Key Question Biology SBI4U-C ILC 1) Mg2+ Has 10 electrons. 2) Carbon -14 would not be effective at dating bones that are millions of years old. Carbon -14 is effective at dating to a maximum of 40 000 to 50 000 years old. The isotope decays over time and would not be present on bones that are millions of years old. 3) Hydrolysis - Water used to breakdown molecules. Hydro means water and lysis means to breakdown. An example of hydrolysis in action within our bodies is how ourRead MoreWhy I Am Interested Of Taking The Chromatin, Epigenetics, And Gene Expression Course995 Words   |  4 PagesChromatin, Epigenetics, and Gene Expression course. I have always had a lifelong thirst for knowledge. As a child I was always asking questions about why or how things worked. I would always tinker with things, taking them apart and reassembling them. I questioned pretty much everything and longed to be able to do experiments and find solutions to unanswered questions on my own. In high school, I volunteered, participated in athletics, held leadership roles in several clubs, and also worked part-timeRead MoreThe Research Methods Of Internet Articles1554 Words   |  7 PagesThere were four research methods that were used in this research question. The use of internet articles, email interview, library books and visits to the museum. Out of all those research methods, the most effective was the internet articles and the visits to the SA museum. In this evaluation the four research methods will be discussed in details along with their pros and cons. Internet articles were one of the main research methods, and it was chosen because using search engines such as googleRead MoreBiology : Evolution, Energy, Information, And Systems1436 Words   |  6 PagesBiology, the study of life and living organisms, is complex and encompasses a multitude of theories and ideas. In AP Biology, the fourth unit covered was genetics. Chapters 11, 12, 13, 14, 15, 16, and 18 in the textbook, Campbell’s Biology in Focus, not only discusses the four main ideas of biology: evolution, energy, information, and systems, but it also gives examples of each in order to help guide the reader’s understanding of the concepts. 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As a research associate, I also make stock solutions and provide support for the staff scientists, post-docs, and graduate students that work in the lab. I work to help them find the answers to the questions they wish to ask about the biological systemRead More Daniel Dennetts Darwins Dangerous Idea: Evolution and the Meanings of Life1022 Words   |à ‚  5 Pagesinferior, it just happened that way because of social circumstances. It has nothing to do with biology. So what! Science here offers no ethical insight; it only prompts indifference. Even if Darwinism is no justification for social injustice, it does nothing to suggest that there is an urgent need for social change. At worst, if one does not take away from this a warning not to mix ideas about society and biology lightly, it might lead one to think that social circumstances are just another random differenceRead MoreThe Role Of The Circulatory Systems And Defense Systems1712 Words   |  7 Pages1. 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