BIO 107 - EXAM #1 – CSUN QUESTIONS AND ANSWERS 100% SOLVED
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Course
BIO 107
Institution
BIO 107
BIO 107 - EXAM #1 – CSUN
QUESTIONS AND ANSWERS 100%
SOLVED
All Matter including living organisms, are composed of: atoms and combinations of
atoms
Protons are: Positively charged particles located in the nucleus
Neutrons are: uncharged particles located in the nucleus
Electrons are: nega...
BIO 107 - EXAM #1 – CSUN QUESTIONS A ND ANSWERS 100% SOLVED All Matter including living organisms, are composed of: ✔✔atoms and combinations of atoms Protons are: ✔✔Positively charged particles located in the nucleus Neutrons are: ✔✔uncharged particles located in the nucleus Electrons are: ✔✔negatively charged particles found in orbitals surrounding the nucleus An Element is: ✔✔a pure substance that cant be broken down into simpler components by ordinary chemical or physical techniques. Atoms combine chemically in fixed numbers and rations to form the: ✔✔molecules Each atom consists of an atomic __________ surrounded by negatively -charged electrons ✔✔Nucleus The number of protons in a nuclei are called the: ✔✔atomic number The nuclei of all atoms also contain uncharged: ✔✔neutrons mass number = ✔✔(# of protons) + (# of neutrons) Isotopes are: ✔✔distinct forms of atoms of an element with the same number of protons but different numbers of neutrons. Nuclei of some isotopes are unstable and break down giving off particles of matter and energy, this is: ✔✔radioactivity The most important applications of radioisotopes are as labels or: ✔✔tracers The region of space where an electron is found most frequently is its: ✔✔orbital Orbitals make up: ✔✔energy levels or electron shells electrons in an atoms outermost energy level are its: ✔✔valence electrons Atoms of reactive elements tend to combine into molecules by forming: ✔✔Chemical bonds The five most important chemical interactions in biological molecules are: ✔✔Covalent bonds, Ionic bonds, Hydrogen bonds, Hydrophobic interactions, and Van Der Walls Forces Covalent bonds form when atoms share pairs of: ✔✔valence electrons for covalent bonds, stronger bonds are: ✔✔shorter than longer bonds In a nonpolar covalent bond: ✔✔electrons are shared equally In a polar covalent bond: ✔✔electrons are shared unequally In a polar covalent bond the atom that attracts the electrons: ✔✔more strongly carries a partial negative charge. A cation carries a: ✔✔positive charge an anion carries a: ✔✔negative charge ionic bonds have three key features: ✔✔-exert an attractive force -force extends in all directions -vary in strength An atom with a high _________ will hold the electrons more tightly and have partial negativity ✔✔electronegativity In nonpolar covalent bonds atoms have: ✔✔no charge in Polar covalent bonds atoms have: ✔✔partial charge in Ionic bonds atoms have: ✔✔full charge Hydrogen Bonds ✔✔are attractions between partially positive H atoms and partially negative atoms Hydrophobic Interactions ✔✔involve the exclusion of non -polar molecules from the hydrogen -bonding lattice of water molecules Van der Waals Forces ✔✔are weak forces that develop over very short distances between nonpolar molecules
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