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MTTC BIOLOGY (17) TEST PREP QUESTIONS AND ANSWERS LATEST UPDATE
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MTTC BIOLOGY (17) TEST PREP QUESTIONS AND ANSWERS LATEST UPDATE
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MTTC BIOLOGY (17) TEST PREPQUESTIONS AND ANSWERS LATEST
UPDATE
______ is considered to be the central atom of organic compounds Answer: carbon
carbon atoms each have Answer: four valence electrons and require four more electrons to have a
stable outer shell
In Carbon, due to the repulsion between the valence electrons, Answer: bond sites are all
equidistant from each other which allows carbon to form long chains and rings
Carbon can form _________ bonds Answer: single covalent bones and also from double or triple
covalent bonds
Organic molecules Answer: contain carbon and hydrogen, these can be very complex structures
Organic molecules can have carbon backbones that form Answer: long chains, branched chains or
even rings
Organic compounds are less soluble in Answer: water than inorganic compounds
4 Classes of organic compounds Answer: carbohydrates, lipids, proteins and nucleic acids
Examples of organic compounds Answer: sucrose, cholesterol, insulin and DNA
, Inorganic molecules Answer: do not contain carbon and hydrogen
Inorganic molecules include Answer: salts and metals such as sodium chloride, oxygen and carbon
dioxide
Chemical bonds Answer: attractive forces that bind atoms together to form molecules
Chemical bones include Answer: covalent bonds, ionic bonds and metallic bonds
Covalent bonds Answer: are formed from the sharing of electron pairs between two atoms in a
molecule
In organic molecules, carbon atoms from Answer: single, double or triple covalent bonds
Organic compounds including Answer: proteins, carbohydrates, lipids and nucleic acids are
molecular compounds formed by covalent bonds
intermolecular forces Answer: are the attractive forces between molecules
Intermolecular forces include Answer: hydrogen bonds, London or dispersion forces and dipole-
dipole forces
Hydrogen bonds Answer: are the attractive forces between molecules containing hydrogen atoms
covalently bonded to oxygen, fluorine or nitrogen
Hydrogen bonds bind Answer: the two strands of a DNA molecule to each other; two hydrogen
bonds join each adenosine and thymine.
three hydrogen bonds join each cytosine and guanine
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