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. What kind of lipids compromise the lipid bilayer?
phospholipids
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
D- amino acid
amphipathic
2. PH at which positive and negative charges balance to form a zwitterion
Cause of Amino acid separation in gel electrophoresis
pI
have acidic carboxylic acid on side chains - w/ pKa around 4
glycogen
3. Storage form of fatty acid that is composed of 3 esterified fatty acid to a glycerol molecule
glucose - alpha -1 -4- glucose
ketose
C3H6O3 - with one chiral center
triacylglycerol
4. Enzymes that hydrolyze fats
peptide bond
all acidic - basic - and polar amino acids
lipases
alpha helix
5. Adjacent polypeptide strands running in the same direction in Beta pleated sheet structure
mutarotation
disulfide bond
parallel beta sheet
anomers
6. 1.has partial double bond character due to resonance 2. it cannot rotate 3. amide H is someWhat acidic and can H bond
Characteristics of the peptide bond
unsaturated fatty acid
mutarotation
ketose
7. 2 covalent bonds formed in proteins
addition of water across of a bond
serine - threonine - asparagine - glutamine - cysteine - tyrosine
C3H6O3 - with one chiral center
peptide bonds and disulfide bonds
8. Rule for all amino acids that are nonbasic and nonacidic pertaining to pI value?
will have pI of 6
primary structure
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
1. form phospholipids of cellular membranes 2. store energy in adipose tissue 3. produce steroid hormones
9. Molecule can act as a base and as an acid
Ka
primary structure
optical activity
amphoteric
10. What describes the affinity of functional groups for a proton?
isomers
C3H6O3 - with one chiral center
pyranose
Ka
11. Enzyme that hydrolyzes maltose into 2 glucose molecules?
absolute configuration
maltase
L- configuration
phospholipids
12. Acidic amino acids
only achiral amino acid
Beta pleated sheet
glutamic acid and aspartic acid
Proteins
13. Glyceraldehyde
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
C3H6O3 - with one chiral center
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
7.4
14. Sulfur containing amino acids
glucose - alpha -1 -4- glucose
pI
glycogen
cysteine and methionine
15. PH at which the amino acid has a net neutral charge
L- configuration
absolute configuration
parallel beta sheet
isoelectric point
16. Sugar with an aldehyde at the first carbon position
isoelectric point
pI
will have pI of 6
aldose
17. Acetic acid formula?
CH3COOH
only amino acid that his a secondary amine
serine - threonine - asparagine - glutamine - cysteine - tyrosine
Cause of Amino acid separation in gel electrophoresis
18. Glycosidic linkage of sucrose
3 things about the cyclic form of a sugar as a hemiacetal
only achiral amino acid
glucose - alpha -1 -2- fructose
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
19. Characteristics of hydrophobic amino acids
pI
7.4
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
triacylglycerol
20. Physiological pH
will have pI of 6
histidine - arginine - lysine
7.4
have amino group in their side chains
21. (R) and (S) describe what?
alpha helix
absolute configuration
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
Cause of Amino acid separation in gel electrophoresis
22. Structure where H bonds occur btw residues distant from each other - or on a separate chain. backbone is extended rather than coiled
Beta pleated sheet
1. presence of strong acids 2. proteolytic enzymes
secondary structure
glucose - beta -1 -4- glucose
23. Adjacent polypeptide strands running in opposite directions in Beta pleated sheet structure
all acidic - basic - and polar amino acids
CH3COOH
antiparallel beta sheet
will have pI of 6
24. Interconversion btw two anomers
D- amino acid
Beta pleated sheet
mutarotation
Cause of Amino acid separation in gel electrophoresis
25. Formula for urea
Proteins
NH2CONH2
Beta pleated sheet
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
26. 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
glucose - alpha -1 -4- glucose
3 things about the cyclic form of a sugar as a hemiacetal
parallel beta sheet
isoelectric point
27. Amino group placed on the left of a fischer projection is a?
have acidic carboxylic acid on side chains - w/ pKa around 4
L- amino acid
maltase
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
28. Enzyme that hydrolyzes lactose into galactose and glucose into
has thiol group that allows it the form disulfide bond
lactase
1. presence of strong acids 2. proteolytic enzymes
glucose - alpha -1 -2- fructose
29. Polar amino acids
quaternary structure
L- amino acid
antiparallel beta sheet
serine - threonine - asparagine - glutamine - cysteine - tyrosine
30. Fatty acid structure
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
isoelectric point
serine - threonine - asparagine - glutamine - cysteine - tyrosine
31. Unique feature of glycine
quaternary structure
only achiral amino acid
parallel beta sheet
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
32. Unique feature of proline
isoelectric point
primary structure
only amino acid that his a secondary amine
modulates fluidity and seeks to maintain optimal fluidity
33. Characteristics of acidic amino acids
van der Waal forces of hydrophobic tails
glucose - beta -1 -4- glucose
anomers
have acidic carboxylic acid on side chains - w/ pKa around 4
34. Macromolecule that performs a variety of bodily functions and is composed of up to 20 different amino acids
have amino group in their side chains
amphoteric
Proteins
glycogen
35. Characteristics of polar amino acids
alpha helix
will have pI of 6
absolute configuration
have an R group that is polar enough to H bond - but does no acts an acid or a base
36. Glycosidic linkage of maltose
glucose - alpha -1 -4- glucose
saturated fatty acid
the basic precursor of the molecule (L or D glyceraldehyde)
pI
37. Sugar with a carbonyl group at the 2 carbon position
have an R group that is polar enough to H bond - but does no acts an acid or a base
glycogen
only achiral amino acid
ketose
38. Fatty acid w/ one or more double bonds in cis form predominately
unsaturated fatty acid
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
CH3COOH
antiparallel beta sheet
39. The amino acid sequence of a protein that is determined by peptide bond
mutarotation
cysteine and methionine
tertiary structure
primary structure
40. Hydrophobic and hydrophilic interactions btw amino acids more distant from each other on the polypeptide chain
tertiary structure
glucose - alpha -1 -4- glucose
maltase
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
41. Diastereomers that vary in the configuration of 1 chiral center
aldose
epimers
pI
Characteristics of the peptide bond
42. Amino group placed on the right of a fischer projection is a?
glucose - beta -1 -4- glucose
saturated fatty acid
packing and energy content
D- amino acid
43. Unique feature of cysteine
has thiol group that allows it the form disulfide bond
amphipathic
starch
Ka
44. Characteristic of basic amino acids
aldose
addition of water across of a bond
maltase
have amino group in their side chains
45. Naturally occurring carbohydrates are formed from what?
triacylglycerol
D- glyceraldehyde
only amino acid that his a secondary amine
D- amino acid
46. Property of fatty acids where one end is hydrophobic and the other is hydrophilic
amphipathic
L- amino acid
parallel beta sheet
7.4
47. Epimers of sugars that vary in the configuration of their anomeric carbons
will have pI of 6
anomers
7.4
pyranose
48. Initial folding of proteins into shapes stabilized by H bonds btw amino and carboxyl groups of backbone
secondary structure
only amino acid that his a secondary amine
will have pI of 6
CH3COOH
49. 3 physiological roles of lipids
primary structure
2 things about the cyclic form of a sugar as an acetal
1. form phospholipids of cellular membranes 2. store energy in adipose tissue 3. produce steroid hormones
parallel beta sheet
50. Energy storage molecule of carbohydrates for plants
starch
tertiary structure
maltase
Proteins