BS 161 FINAL EXAM WITH CORRECT 120+
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2024
ALREADY GRADED A+
Explain the functional and evolutionary significance of introns. -
ANSWERS-Functional: introns may control gene activity; alternate
splicing can give >1 protein from the same gene
Evolutionary: exons code for functional domains of proteins; widely
spaced functional components allows recombination -> new protein
why water is able to form hydrogen bonds - ANSWERS-they have polar
covalent bonds and the partially positive hydrogen bonds to other
partially negative oxygens
,Compare and contrast the strength of each interaction in a solid versus
an aqueous solution. - ANSWERS-Solid has higher concentration of
bonds than aqueous solution
why polar and charged species dissolve in water - ANSWERS-molecules
that have partially positive and partially negative areas are polar and
can be dissolved in water
water can attract charged particles because it has partially positive and
negative areas and if the attractions between the ions and water are
stronger than attractions between ions it will dissolve in water
bonds between solute compound are disrupted in order to increase
bond length and allow aqueous solution to flow through
why oil will not dissolve in water - ANSWERS-water is polar and oil is
nonpolar so their molecules do not attract each other
List the common functions of proteins in cells - ANSWERS-energy
storage, structural support, transport, messengers, enzyme catalyst etc.
Describe four levels of protein structure and identify common
representations - ANSWERS-Primary- amino acid chain
,Secondary- alpha helix beta pleated sheets
Tertiary- proteins or polypeptides
Quaternary- multiple polypeptides
Define a lipid. - ANSWERS-Insoluble in water and soluble in organic
substances
Draw the difference between saturated and unsaturated fats -
ANSWERS-Unsaturated has double bonds, and saturated has a carbon
bonded to at least 2 hydrogens
Explain the difference between solid fats and liquid oils on a molecular
level. - ANSWERS-Solid fats have more hydrogens, the more hydrogens
there are the more concentrated it is therefore the more solid it is
Define a biological membrane. - ANSWERS-Selectively permeable
barrier between living things
, Describe the fluid mosaic model of membrane structure. - ANSWERS-
Different transport proteins that allow ions to be diffused through a
bilayer
Describe difference between peripheral and integral membrane
proteins. - ANSWERS-Integral proteins are on the inside and nonpolar
regions of membranes of hydrophobic layer and peripheral proteins are
on the surface and it is on mitochondria and chloroplasts
List six major functions of membrane proteins. - ANSWERS-Transporters
enzymes- carry out chemical reactions
cell surface receptors- detect chemical messages and anchors to
surface
cell surface id receptors
cell to cell adhesion proteins
cytoskeleton proteins
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