16737292
Descripción
Test por Alison Chase, actualizado hace más de 1 año
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Creado por Alison Chase
hace casi 6 años
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Pregunta 1
Pregunta
What are the four types of atoms that make up 96% of all matter found in organisms?
Respuesta
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hydrogen, carbon, nitrogen, and oxygen
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hydrogen, carbon, oxygen, and sulfur
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hydrogen, oxygen, nitrogen, and phosphorus
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hydrogen, oxygen, phosphorus, and sulfur
Pregunta 2
Pregunta
What types of molecules have hydrophilic interactions?
Respuesta
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polar
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non polar
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ionic
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polar and ionic
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non polar and ionic
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all of the above
Pregunta 3
Pregunta
Why is it that diving bell spiders do not drown when on water?
Respuesta
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surface tension
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water resists forces that increase it surface area
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cohesion
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surface tension and cohesion
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all of the above
Pregunta 4
Pregunta
Which has greater potential energy?
Respuesta
-
short bonds like that found in a hydroxyl group
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strong bonds
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long bonds like that found between carbon and hydrogen
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weak bonds
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short bonds like that found in a hydroxyl group and strong bonds
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long bonds like that found between carbon and hydrogen and weak bonds
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all of the above
Pregunta 5
Pregunta
Organic molecules means...
Respuesta
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molecules that contain carbon
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octane
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molecules that contain water
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molecules that contain carbon and octane
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all of the above
Pregunta 6
Pregunta
How amino acids make up the building blocks of proteins?
Respuesta
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10
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20
-
infinite
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50
Pregunta 7
Pregunta
What makes proteins different from one another
Respuesta
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hydrophilic interactions
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R-groups
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amino group
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carboxyl group
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amino and carboxyl group
Pregunta 8
Pregunta
Monomers polymerize through...
Respuesta
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condensation reactions
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hydrolysis
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dehydration reactions
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condensation and dehydration reactions
Pregunta 9
Pregunta
What are the three main components of a peptide-bonded backbone?
Respuesta
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R-group orientation
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Directionality
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Flexibility
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R-group orientation and flexibility
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all of the above
Pregunta 10
Pregunta
What is the secondary structure of proteins?
Respuesta
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the unique sequence of amino acids
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combinations of polypeptides
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interactions between residues that are brought together as the chain bends and folds in space
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created by the interactions between functional groups
Pregunta 11
Pregunta
Molecular chaperones do the following...
Respuesta
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denatures proteins
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facilitate protein folding
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recognize unfolded proteins by binding to hydrophobic patches that are not normally exposed
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unfolds proteins
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denatures proteins and unfolds proteins
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facilitate protein folding and recognize unfolded proteins by binding to hydrophobic patches that are not normally exposed
Pregunta 12
Pregunta
Which of the following describes enzymes?
Respuesta
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"lock and key"
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catalyze reactions
-
all of the above
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none of the above
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Fischer's model
Pregunta 13
Pregunta
Which of the following describes the sugar present in a nucleotide?
Respuesta
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4' carbon sugar
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6' carbon sugar
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5' carbon sugar
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none of the above
Pregunta 14
Pregunta
Which of the following are pyrimidines?
Respuesta
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cytosine
-
uracil
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adenine
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guanine
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cytosine and uracil
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adenine and cytosine
Pregunta 15
Pregunta
Which term describes the bond that polymerizes nucleic acids?
Respuesta
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glycosidic linkages
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peptide bonds
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phosphodiester bonds
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none of the above
Pregunta 16
Pregunta
Which of the following is not true of DNA?
Respuesta
-
tertiary structure follows the Watson-Crick pairing
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has ribose as its sugar
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has an antiparallel structure
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none of the above
Pregunta 17
Respuesta
-
polypeptide
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DNA
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RNA
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steroid
Pregunta 18
Pregunta
Which of the following means "many-sugars?"
Respuesta
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monomers
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monosaccharides
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polysaccharides
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oligosaccharides
Pregunta 19
Pregunta
Which of the following is a ketose?
Respuesta
-
Image:Ketose (binary/octet-stream)
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none of the above
Pregunta 20
Pregunta
Which of the following describes the chemical structure of starch?
Respuesta
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contains alpha-glucose joined by glycosidic linkages
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amylose and amylopectin
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both alpha 1,4 glycosidic linkages and alpha 1,6 glycosidic linkages
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contains alpha-glucose joined by glycosidic linkages and both alpha 1,4 glycosidic linkages and alpha 1,6 glycosidic linkages
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all of the above
Pregunta 21
Pregunta
Which of the following describes a glycoprotein?
Respuesta
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is a protein that is linked to a carbohydrate
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protein that is linked to a oligosaccharides
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spans the glycolipid
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all of the above
-
none of the above
Pregunta 22
Pregunta
Highly unsaturated lipids are _____ at room temperature
Respuesta
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solid
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partially solid
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partially liquid
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liquid
Pregunta 23
Pregunta
What is the commonality shared between micelles and lipid bilayers?
Respuesta
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They are both circular in formation
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They are both linear in formation
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Both have hydrophobic tails facing one another
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Both have hydrophobic heads facing one another
Pregunta 24
Pregunta
Lipid bilayer with short and unsaturated hydrocarbon tails have...
Respuesta
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lower permeability
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lower fluidity
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higher permeability
Pregunta 25
Pregunta
The following statement describes which: As water leaves, the vesicle shrinks and the membrane shrivels.
Respuesta
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hypotonic
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hypertonic
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isotonic
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none of the above
Pregunta 26
Pregunta
Exergonic reactions have the following qualities...
Respuesta
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delta G is less than zero
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delta G is greater than zero
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delta G is equal to zero
Pregunta 27
Pregunta
Phosphorylation is when...
Respuesta
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addition of a phosphate group to a substrate
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removal of a phosphate group to a substrate
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none of the above
Pregunta 28
Pregunta
The following characteristics represent an "induced fit":
Respuesta
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reorients the substrates and bind them tighter to the active site
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conformational change of the active site
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when substrate and active site collide in precise orientation
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reorients the substrates and bind them tighter to the active site and conformational change of the active site
Pregunta 29
Pregunta
Which of the following describes feedback inhibition?
Respuesta
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when the concentration of a product molecule becomes rare
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when the concentration of the product molecule becomes abundant
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"feeds back" to stop reaction sequence
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"feeds back" to stop product sequence
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when the concentration of the product molecule becomes abundant and "feeds back" to stop reaction sequence
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when the concentration of a product molecule becomes rare and "feeds back" to stop reaction sequence
Pregunta 30
Pregunta
Which of the following does not occur during glycolysis?
Respuesta
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one five-molecule carbon molecule of glucose is broken down
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glucose is broken down into two molecules of three-carbon pyruvate
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NAD+ is reduced to form NADH
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ATP is produced from ADP and Pi
Pregunta 31
Pregunta
Which of the following is not true about the citric acid cycle?
Respuesta
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each acetyl CoA is oxidized to two molecules of CO2
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each acetyl CoA is reduced to two molecules of CO2
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more ATP and NADH is produced
-
FAD is reduced to form FADH2
Pregunta 32
Pregunta
Lactic acid fermentation
Respuesta
-
regenerates NAD+ by forming lactate
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yeast converts pyruvate to the two-carbon compound acetaldehyde
-
both of the above
-
none of the above
Pregunta 33
Pregunta
Protein conformation is generally not obtained until the
Respuesta
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primary level
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secondary level
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tertiary level
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quaternary level
Pregunta 34
Pregunta
Which of the following hydrocarbons has a double bond in its carbon skeleton?
Respuesta
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C3H8
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C2H6
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C2H4
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CH4
Pregunta 35
Pregunta
Acids in solution
Respuesta
-
donate OH ions
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donate H ions
-
can remove OH ions
-
donate OH ions and can remove OH ions
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donate H ions and can remove OH ions
Pregunta 36
Pregunta
The fact that lipids are high in potential energy is due to the
Respuesta
-
multiple carbon to hydrogen bonds
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solubility of each glycerol molecule
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the number of oxygen to hydrogen bonds
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the number of oxygen to carbon bonds
Pregunta 37
Pregunta
The amino group can functionally
Respuesta
-
act as an acid
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cause solutions to gain a sour taste
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act as a base
-
none of the above apply
Pregunta 38
Pregunta
The chemical behavior of amino acids is primarily due to
Respuesta
-
the nature of the N terminis
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the nature of the C terminis
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the R group
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none of the above
Pregunta 39
Pregunta
A triple bond between two atoms would involve the sharing of
Respuesta
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2 electrons
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3 electrons
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8 electrons
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6 electrons
Pregunta 40
Pregunta
The monomers that construct primary proteins are
Respuesta
-
simple sugars
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lipids
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amino acids
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polypeptides
Pregunta 41
Pregunta
The atomic number of an atom is 12. The number of valence electrons is
Respuesta
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4
-
3
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2
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none of the above
Pregunta 42
Pregunta
Tertiary structures are more rigid than secondary protein structures because
Respuesta
-
the number and type of possible chemical bonds increases
-
the bond length in hydrogen bonds increases
-
the bond length in hydrogen bonds decreases
-
the number and type of possible chemical bonds increases and the bond length in hydrogen bonds decreases
-
none of the above would apply
Pregunta 43
Pregunta
Most complex carbohydrates are constructed from
Respuesta
-
amino acids
-
lipids
-
monosaccharides
-
glycogen
Pregunta 44
Pregunta
Enzymes can regulate/influence the amount of energy required for a chemical reaction to proceed
Respuesta
-
by lowering the activation energy
-
decreasing the randomness of molecular formation
-
increasing the randomness of molecular formation
-
by lowering the activation energy and decreasing the randomness of molecular formation
-
by lowering the activation energy and increasing the randomness of molecular formation
Pregunta 45
Pregunta
weak acids typically dissociate
Respuesta
-
partially
-
completely
-
not at all
Pregunta 46
Pregunta
glycogen is a
Respuesta
-
monosaccharides stored in animals
-
monosaccharides stored in plants
-
polysaccharides stored in animals
-
polysaccharides stored in plants
Pregunta 47
Pregunta
the hydrophobic end of a protein would
Respuesta
-
readily not dissolve in water
-
readily dissolve in water
-
make the solution acidic
-
none of the above is true
Pregunta 48
Pregunta
if the concentration of H+ ions and OH- ions in solution is equal, then the pH will be
Respuesta
-
acidic
-
neutral
-
basic
-
strongly acidic
-
strongly basic
Pregunta 49
Pregunta
The 5' --> 3' linear directionality of a DNA polymer is established
Respuesta
-
when the 5' carbon and its phosphate group of a proceeding nucleotide attaches to the 3' carbon of the preceding nucleotide.
-
only in the anti-parallel strand of DNA
-
when the nitrogenous bases form hydrogen bonds
-
none of the above are correct
Pregunta 50
Pregunta
a pyruvate molecule contains
Respuesta
-
1 carbon atom
-
3 carbon atoms
-
6 carbon atoms
-
2 carbon atoms
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