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