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. Glycosidic linkage of cellulose
van der Waal forces of hydrophobic tails
glucose - beta -1 -4- glucose
disulfide bond
the basic precursor of the molecule (L or D glyceraldehyde)
2. Nonpolar - hydrophobic amino acids
modulates fluidity and seeks to maintain optimal fluidity
D- glyceraldehyde
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
lipases
3. Epimers of sugars that vary in the configuration of their anomeric carbons
glucose - alpha -1 -4- glucose
glycogen
anomers
only amino acid that his a secondary amine
4. Sulfur containing amino acids
antiparallel beta sheet
histidine - arginine - lysine
NH2CONH2
cysteine and methionine
5. Interconversion btw two anomers
mutarotation
absolute configuration
the basic precursor of the molecule (L or D glyceraldehyde)
quaternary structure
6. Enzyme that hydrolyzes lactose into galactose and glucose into
CH3COOH
primary structure
lactase
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
7. Hydrophilic amino acids
all acidic - basic - and polar amino acids
stereoisomers
amphoteric
amphipathic
8. Energy storage molecule of carbohydrates for plants
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
furanose
starch
epimers
9. Separation is due to charge - with negative charge moving toward positive electrode and positive charge moving toward negative electrode
disulfide bond
peptide bonds and disulfide bonds
isomers
Cause of Amino acid separation in gel electrophoresis
10. 2 covalent bonds formed in proteins
isomers
peptide bonds and disulfide bonds
2 things about the cyclic form of a sugar as an acetal
lactase
11. Initial folding of proteins into shapes stabilized by H bonds btw amino and carboxyl groups of backbone
secondary structure
antiparallel beta sheet
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
absolute configuration
12. Hydrophobic and hydrophilic interactions btw amino acids more distant from each other on the polypeptide chain
Cause of Amino acid separation in gel electrophoresis
aldose
tertiary structure
furanose
13. Histidine
D- amino acid
all acidic - basic - and polar amino acids
amphoteric
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
14. Property of fatty acids where one end is hydrophobic and the other is hydrophilic
amphipathic
glucose - beta -1 -4- glucose
will have pI of 6
glucose - alpha -1 -4- glucose
15. Unique feature of glycine
only achiral amino acid
have amino group in their side chains
Cause of Amino acid separation in gel electrophoresis
aldose
16. Characteristic of basic amino acids
have amino group in their side chains
NH2CONH2
quaternary structure
L- amino acid
17. Acetic acid formula?
maltase
furanose
secondary structure
CH3COOH
18. Energy storage molecule of carbohydrates for animals
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
aldose
1. presence of strong acids 2. proteolytic enzymes
glycogen
19. D and L describe what?
stereoisomers
van der Waal forces of hydrophobic tails
cysteine and methionine
the basic precursor of the molecule (L or D glyceraldehyde)
20. Polar amino acids
Cause of Amino acid separation in gel electrophoresis
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
addition of water across of a bond
serine - threonine - asparagine - glutamine - cysteine - tyrosine
21. (R) and (S) describe what?
amphoteric
saturated fatty acid
Characteristics of the peptide bond
absolute configuration
22. What stabilizes lipid bilayer?
glucose - alpha -1 -4- glucose
van der Waal forces of hydrophobic tails
Proteins
lactase
23. PH at which positive and negative charges balance to form a zwitterion
pI
glutamic acid and aspartic acid
D- glyceraldehyde
addition of water across of a bond
24. What describes the affinity of functional groups for a proton?
modulates fluidity and seeks to maintain optimal fluidity
peptide bonds and disulfide bonds
Ka
have amino group in their side chains
25. Glycosidic linkage of maltose
optical activity
has thiol group that allows it the form disulfide bond
3 things about the cyclic form of a sugar as a hemiacetal
glucose - alpha -1 -4- glucose
26. Macromolecule that performs a variety of bodily functions and is composed of up to 20 different amino acids
Proteins
pI
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
C3H6O3 - with one chiral center
27. Molecules with the same atoms - but different bonds
maltase
isomers
galactose - beta -1 -4- glucose
phospholipids
28. 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
NH2CONH2
phospholipids
7.4
29. Physiological pH
peptide bond
7.4
antiparallel beta sheet
parallel beta sheet
30. 2 things that accelerate the rate of hydrolysis for peptide cleavage?
primary structure
will have pI of 6
parallel beta sheet
1. presence of strong acids 2. proteolytic enzymes
31. Covalent bond formed btw carboxyl group of one atom and the amino group of another amino acid in an addition - elimination mechanism - enzymes are required to carry out rxn
peptide bond
parallel beta sheet
Cause of Amino acid separation in gel electrophoresis
unsaturated fatty acid
32. Amino group placed on the left of a fischer projection is a?
L- amino acid
phospholipids
will have pI of 6
anomeric carbon
33. Molecule can act as a base and as an acid
pyranose
mutarotation
amphoteric
quaternary structure
34. Generated btw either thiols on different proteins or thiols on the same protein
disulfide bond
glycogen
the basic precursor of the molecule (L or D glyceraldehyde)
phospholipids
35. Fatty acid w/ one or more double bonds in cis form predominately
anomers
glucose - beta -1 -4- glucose
unsaturated fatty acid
Cause of Amino acid separation in gel electrophoresis
36. Hydrolysis
all acidic - basic - and polar amino acids
1. form phospholipids of cellular membranes 2. store energy in adipose tissue 3. produce steroid hormones
addition of water across of a bond
anomeric carbon
37. What kind of lipids compromise the lipid bilayer?
anomeric carbon
have an R group that is polar enough to H bond - but does no acts an acid or a base
tertiary structure
phospholipids
38. Adjacent polypeptide strands running in the same direction in Beta pleated sheet structure
anomers
parallel beta sheet
van der Waal forces of hydrophobic tails
glucose - beta -1 -4- glucose
39. Characteristics of acidic amino acids
triacylglycerol
has thiol group that allows it the form disulfide bond
1. presence of strong acids 2. proteolytic enzymes
have acidic carboxylic acid on side chains - w/ pKa around 4
40. Diastereomers that vary in the configuration of 1 chiral center
epimers
phospholipids
have amino group in their side chains
Beta pleated sheet
41. Acidic amino acids
secondary structure
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
glutamic acid and aspartic acid
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
42. Glycosidic linkage of sucrose
glucose - alpha -1 -2- fructose
lipases
Ka
alpha helix
43. Fatty acid structure
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
pyranose
peptide bond
D- glyceraldehyde
44. Structure where H bonds occur btw residues distant from each other - or on a separate chain. backbone is extended rather than coiled
glucose - beta -1 -4- glucose
modulates fluidity and seeks to maintain optimal fluidity
Beta pleated sheet
all acidic - basic - and polar amino acids
45. Unique feature of proline
glucose - beta -1 -4- glucose
have acidic carboxylic acid on side chains - w/ pKa around 4
peptide bond
only amino acid that his a secondary amine
46. Name for 6 membered ring
7.4
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
glucose - alpha -1 -4- glucose
pyranose
47. What configuration do all naturally occuring amino acids have?
L- configuration
the basic precursor of the molecule (L or D glyceraldehyde)
peptide bonds and disulfide bonds
pI
48. Fatty acid w/ no double bonds and maximum number of hydrogens
D- amino acid
phospholipids
saturated fatty acid
epimers
49. Characteristics of hydrophobic amino acids
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
D- amino acid
secondary structure
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
50. The amino acid sequence of a protein that is determined by peptide bond
primary structure
Ka
peptide bonds and disulfide bonds
will have pI of 6