SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
MCAT Organic Chemistry 2
Start Test
Study First
Subjects
:
mcat
,
science
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Nonpolar - hydrophobic amino acids
addition of water across of a bond
phospholipids
only amino acid that his a secondary amine
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
2. Enzymes that hydrolyze fats
D- glyceraldehyde
lipases
glucose - beta -1 -4- glucose
have an R group that is polar enough to H bond - but does no acts an acid or a base
3. Sugar with a carbonyl group at the 2 carbon position
ketose
stereoisomers
addition of water across of a bond
pyranose
4. Fatty acid structure
lipases
Beta pleated sheet
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
C3H6O3 - with one chiral center
5. Characteristic of basic amino acids
tertiary structure
D- amino acid
have amino group in their side chains
L- configuration
6. Storage form of fatty acid that is composed of 3 esterified fatty acid to a glycerol molecule
alpha helix
maltase
anomeric carbon
triacylglycerol
7. (R) and (S) describe what?
triacylglycerol
pI
absolute configuration
ketose
8. 2 reasons why fats have more efficient energy stores than carbs
D- glyceraldehyde
van der Waal forces of hydrophobic tails
Cause of Amino acid separation in gel electrophoresis
packing and energy content
9. Glycosidic linkage of cellulose
starch
the basic precursor of the molecule (L or D glyceraldehyde)
isomers
glucose - beta -1 -4- glucose
10. Property of fatty acids where one end is hydrophobic and the other is hydrophilic
amphipathic
only achiral amino acid
furanose
antiparallel beta sheet
11. Energy storage molecule of carbohydrates for animals
quaternary structure
unsaturated fatty acid
lactase
glycogen
12. Adjacent polypeptide strands running in opposite directions in Beta pleated sheet structure
anomeric carbon
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
primary structure
antiparallel beta sheet
13. Glycosidic linkage of maltose
glucose - alpha -1 -2- fructose
antiparallel beta sheet
glucose - alpha -1 -4- glucose
starch
14. Rule for all amino acids that are nonbasic and nonacidic pertaining to pI value?
1. presence of strong acids 2. proteolytic enzymes
will have pI of 6
2 things about the cyclic form of a sugar as an acetal
Characteristics of the peptide bond
15. Name for 5 membered ring
D- glyceraldehyde
pyranose
furanose
will have pI of 6
16. Interconversion btw two anomers
will have pI of 6
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
have an R group that is polar enough to H bond - but does no acts an acid or a base
mutarotation
17. What describes the affinity of functional groups for a proton?
peptide bonds and disulfide bonds
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
modulates fluidity and seeks to maintain optimal fluidity
Ka
18. (+) and (-) describe what?
Proteins
will have pI of 6
pyranose
optical activity
19. Acidic amino acids
glutamic acid and aspartic acid
lactase
maltase
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
20. Name for 6 membered ring
pyranose
peptide bonds and disulfide bonds
Cause of Amino acid separation in gel electrophoresis
furanose
21. Initial folding of proteins into shapes stabilized by H bonds btw amino and carboxyl groups of backbone
lactase
van der Waal forces of hydrophobic tails
antiparallel beta sheet
secondary structure
22. Hydrophilic amino acids
all acidic - basic - and polar amino acids
parallel beta sheet
CH3COOH
stereoisomers
23. Separation is due to charge - with negative charge moving toward positive electrode and positive charge moving toward negative electrode
will have pI of 6
Cause of Amino acid separation in gel electrophoresis
amphoteric
only achiral amino acid
24. Macromolecule that performs a variety of bodily functions and is composed of up to 20 different amino acids
glucose - alpha -1 -4- glucose
lipases
Proteins
absolute configuration
25. The amino acid sequence of a protein that is determined by peptide bond
primary structure
has thiol group that allows it the form disulfide bond
tertiary structure
quaternary structure
26. Histidine
galactose - beta -1 -4- glucose
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
addition of water across of a bond
L- configuration
27. 2 things that accelerate the rate of hydrolysis for peptide cleavage?
glutamic acid and aspartic acid
will have pI of 6
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
1. presence of strong acids 2. proteolytic enzymes
28. 4 causes of denaturation of proteins
tertiary structure
only achiral amino acid
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
isoelectric point
29. Energy storage molecule of carbohydrates for plants
starch
Cause of Amino acid separation in gel electrophoresis
1. presence of strong acids 2. proteolytic enzymes
NH2CONH2
30. Characteristics of hydrophobic amino acids
has thiol group that allows it the form disulfide bond
histidine - arginine - lysine
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
anomers
31. Interaction btw polypeptide subunits arranged in polypeptide. can be covalent bonds or intermolecular forces - disulfide bond that does not form btw residues on the same protein affect (blank)
peptide bond
1. presence of strong acids 2. proteolytic enzymes
anomeric carbon
quaternary structure
32. Hydrolysis
addition of water across of a bond
only achiral amino acid
starch
cysteine and methionine
33. 1. it exists in solution in equilibrium with linear form 2. mutarotation occurs readily 3. it is a reducing sugar - and reacts positively w/ Benedict's reagent
pI
absolute configuration
3 things about the cyclic form of a sugar as a hemiacetal
disulfide bond
34. Physiological pH
all acidic - basic - and polar amino acids
furanose
7.4
starch
35. Generated btw either thiols on different proteins or thiols on the same protein
Ka
disulfide bond
have acidic carboxylic acid on side chains - w/ pKa around 4
amphipathic
36. Formula for urea
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
have an R group that is polar enough to H bond - but does no acts an acid or a base
disulfide bond
NH2CONH2
37. Sugar with an aldehyde at the first carbon position
NH2CONH2
alpha helix
aldose
peptide bond
38. Acetic acid formula?
ketose
packing and energy content
CH3COOH
disulfide bond
39. 2 covalent bonds formed in proteins
peptide bonds and disulfide bonds
aldose
amphipathic
glycerol
40. D and L describe what?
1. presence of strong acids 2. proteolytic enzymes
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
the basic precursor of the molecule (L or D glyceraldehyde)
mutarotation
41. Carbon that in linear form has a carbonyl - or in cyclic form has a hemiacetal or an acetal
unsaturated fatty acid
ketose
anomeric carbon
mutarotation
42. Amino group placed on the left of a fischer projection is a?
7.4
absolute configuration
L- amino acid
Proteins
43. What stabilizes lipid bilayer?
disulfide bond
parallel beta sheet
stereoisomers
van der Waal forces of hydrophobic tails
44. Molecule can act as a base and as an acid
glucose - alpha -1 -4- glucose
amphoteric
parallel beta sheet
isomers
45. Characteristics of acidic amino acids
have acidic carboxylic acid on side chains - w/ pKa around 4
glutamic acid and aspartic acid
isomers
secondary structure
46. Right handed helix w/ carboxyl of one amino acid bound to the amine of another amino acid three residues away - proline never resides in this structure b/c it would place a kink in the helix
L- configuration
only achiral amino acid
will have pI of 6
alpha helix
47. Molecules with the same atoms and same bonds - but different bond geometries; can either be enantiomers or diastereomers
glycerol
Proteins
all acidic - basic - and polar amino acids
stereoisomers
48. Glycosidic linkage of lactose
packing and energy content
galactose - beta -1 -4- glucose
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
glycogen
49. Hydrophobic and hydrophilic interactions btw amino acids more distant from each other on the polypeptide chain
only amino acid that his a secondary amine
tertiary structure
L- configuration
absolute configuration
50. Glycosidic linkage of sucrose
glucose - alpha -1 -2- fructose
C3H6O3 - with one chiral center
histidine - arginine - lysine
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water