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BIOL 1P91 Midterm Exam [Brock University] all Questions and Answers 2023
BIOL 1P91 Midterm Exam [Brock University] all Questions and Answers 2023
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BIOL 1P91 Midterm (Brock University)Exam questions and Answers| 100%
Correct Solutions
Three subatomic particles Correct Answer protons, neutrons, electrons
what shape are s orbitals? Correct Answer spherical
How many electrons can each orbital hold? Correct Answer 2 electrons
what is an isotope? Correct Answer Atoms of the same element that have
different numbers of neutrons
What are radioisotopes? Correct Answer unstable isotopes
what are the four most abundant elements? Correct Answer oxygen, carbon,
hydrogen, nitrogen
Three types of bonds? Correct Answer ionic, covalent, hydrogen
What is a covalent bond? Correct Answer A chemical bond formed when two or
atoms share electrons.
what are H bonds? Correct Answer hydrogen atom from one polar molecule is
attracted to an electronegative atom of another and are weak bonds that form and
break easily i.e Holds DNA together
What is a van der Waals force? Correct Answer a slight attraction that develops
between the oppositely charged regions of nearby molecules
What are free radicals? Correct Answer unstable and a single unpaired electron
in the outer shell that are highly reactive and can damage the cells of the body and
possibly contribute to the increased risk of chronic diseases
List some properties of water Correct Answer - high boiling point
- high melting point
- high heat of fusion
- high heat of vapourisation
- high heat capacity
- high dialectic constant
- high surface tension
Most chemical reactions in nature involve molecules that are dissolved in water
Three states of Water? Correct Answer solid (ice), liquid (water), gas (water
vapor)
, What are the colligative properties of water? Correct Answer boiling point, melting
point, vapor pressure, and osmotic pressure (osmolarity)
What are effects of pH? Correct Answer shapes and functions of molecules
rates of chemical reactions
the ability of two molecules to bind to each other
the ability of ions or molecules to dissolve in water
What are buffers? Correct Answer they help maintain a constant pH and can shift
to remove or release H ions to adjust for changes in pH
Functional groups and their properties: Correct Answer
What is an isomer? Correct Answer two molecules with an identical molecular
formula but different structures and characteristics
What are structural isomers? Correct Answer contain the same atoms but in
different bonding relationships
what are stereoisomers? Correct Answer identical bonding relationships, but the
spatial positioning of the atoms differs in the two isomers
What are cis-trans isomers? Correct Answer same covalently bonded atoms but
differ in spatial arrangement . cis= both on top. trans= opposite sides
what are enantiomers and examples? Correct Answer mirror image molecules
Explain the process of a condensation reaction with polymers forming: Correct
Answer A molecule of water is removed each time a new monomer is added
Explain the process of a polymer by a hydrolysis reaction Correct Answer A
molecule of water is added back each time a monomer is released
What are the four major classes of Organic Molecules found in living cells Correct
Answer Carbohydrates, lipids, proteins, nucleic acids
What are carbohydrates? what are they composed of? Correct Answer Form of
sugar, starch, or fiber
Composed of: carbon, hydrogen and oxygen
What are simple sugars? (two types) Correct Answer Pentose(5 carbon) and
Hexose (6 carbon)
What are the stereoisomers of glucose? Correct Answer Alpha and Beta glucose
and D- and L- glucose and galactose
How are disaccharides formed? Correct Answer condensation reaction
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