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