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. Unique feature of cysteine
packing and energy content
triacylglycerol
only achiral amino acid
has thiol group that allows it the form disulfide bond
2. Fatty acid w/ one or more double bonds in cis form predominately
unsaturated fatty acid
furanose
will have pI of 6
histidine - arginine - lysine
3. (+) and (-) describe what?
only achiral amino acid
optical activity
ketose
epimers
4. PH at which positive and negative charges balance to form a zwitterion
furanose
pI
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
mutarotation
5. Diastereomers that vary in the configuration of 1 chiral center
epimers
galactose - beta -1 -4- glucose
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
pyranose
6. Sugar with a carbonyl group at the 2 carbon position
ketose
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
pI
tertiary structure
7. Macromolecule that performs a variety of bodily functions and is composed of up to 20 different amino acids
histidine - arginine - lysine
lactase
Proteins
1. presence of strong acids 2. proteolytic enzymes
8. Glyceraldehyde
cysteine and methionine
C3H6O3 - with one chiral center
anomeric carbon
unsaturated fatty acid
9. Storage form of fatty acid that is composed of 3 esterified fatty acid to a glycerol molecule
optical activity
pI
triacylglycerol
glucose - alpha -1 -4- glucose
10. Epimers of sugars that vary in the configuration of their anomeric carbons
saturated fatty acid
anomers
CH3COOH
pyranose
11. Glycosidic linkage of lactose
antiparallel beta sheet
galactose - beta -1 -4- glucose
furanose
Proteins
12. 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
3 things about the cyclic form of a sugar as a hemiacetal
D- glyceraldehyde
only achiral amino acid
all acidic - basic - and polar amino acids
13. The amino acid sequence of a protein that is determined by peptide bond
packing and energy content
primary structure
has thiol group that allows it the form disulfide bond
CH3COOH
14. Interconversion btw two anomers
mutarotation
lactase
Cause of Amino acid separation in gel electrophoresis
NH2CONH2
15. Polar amino acids
CH3COOH
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
anomeric carbon
serine - threonine - asparagine - glutamine - cysteine - tyrosine
16. Sulfur containing amino acids
peptide bond
NH2CONH2
cysteine and methionine
C3H6O3 - with one chiral center
17. Molecule can act as a base and as an acid
cysteine and methionine
D- amino acid
have acidic carboxylic acid on side chains - w/ pKa around 4
amphoteric
18. Rule for all amino acids that are nonbasic and nonacidic pertaining to pI value?
triacylglycerol
lipases
will have pI of 6
Characteristics of the peptide bond
19. Characteristic of basic amino acids
triacylglycerol
have amino group in their side chains
saturated fatty acid
antiparallel beta sheet
20. Hydrolysis
pyranose
packing and energy content
NH2CONH2
addition of water across of a bond
21. 1. it requires an enzyme to linearize and mutarotate 2. it is not a reducing sugar and give negative Benedict's test
2 things about the cyclic form of a sugar as an acetal
peptide bonds and disulfide bonds
anomers
D- amino acid
22. 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
isomers
van der Waal forces of hydrophobic tails
peptide bond
Beta pleated sheet
23. Acetic acid formula?
pyranose
CH3COOH
saturated fatty acid
7.4
24. 4 causes of denaturation of proteins
glycerol
disulfide bond
glucose - alpha -1 -2- fructose
1. presence of urea 2. extreme pH 3. extreme temperature 4. changes in salinity
25. Fxn of cholesterol in the membrane?
all acidic - basic - and polar amino acids
modulates fluidity and seeks to maintain optimal fluidity
parallel beta sheet
epimers
26. Adjacent polypeptide strands running in the same direction in Beta pleated sheet structure
Cause of Amino acid separation in gel electrophoresis
pyranose
antiparallel beta sheet
parallel beta sheet
27. Enzyme that hydrolyzes maltose into 2 glucose molecules?
maltase
the basic precursor of the molecule (L or D glyceraldehyde)
peptide bonds and disulfide bonds
Beta pleated sheet
28. Generated btw either thiols on different proteins or thiols on the same protein
disulfide bond
glycogen
quaternary structure
epimers
29. Unique feature of glycine
only achiral amino acid
glutamic acid and aspartic acid
van der Waal forces of hydrophobic tails
glucose - alpha -1 -2- fructose
30. Basic amino acids
alpha helix
histidine - arginine - lysine
1. presence of strong acids 2. proteolytic enzymes
isomers
31. D and L describe what?
the basic precursor of the molecule (L or D glyceraldehyde)
basic amino acid has pKa at 6.5 - so it can either be protonated or deprotonated at physiological pH
disulfide bond
D- glyceraldehyde
32. Glycosidic linkage of maltose
parallel beta sheet
histidine - arginine - lysine
glucose - alpha -1 -4- glucose
7.4
33. Formula for urea
epimers
glucose - alpha -1 -2- fructose
NH2CONH2
the basic precursor of the molecule (L or D glyceraldehyde)
34. Name for 6 membered ring
amphipathic
pyranose
isomers
D- glyceraldehyde
35. Fatty acid structure
Cause of Amino acid separation in gel electrophoresis
3 things about the cyclic form of a sugar as a hemiacetal
long chain of unsubstituted alkanes that end in a carboxylic acid - making them amphipathic
lactase
36. Molecules with the same atoms and same bonds - but different bond geometries; can either be enantiomers or diastereomers
alpha helix
stereoisomers
tertiary structure
glycogen
37. Sugar with an aldehyde at the first carbon position
aldose
3 things about the cyclic form of a sugar as a hemiacetal
antiparallel beta sheet
Beta pleated sheet
38. 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
alpha helix
L- amino acid
NH2CONH2
furanose
39. Acidic amino acids
peptide bond
glutamic acid and aspartic acid
van der Waal forces of hydrophobic tails
only achiral amino acid
40. 2 covalent bonds formed in proteins
peptide bonds and disulfide bonds
1. form phospholipids of cellular membranes 2. store energy in adipose tissue 3. produce steroid hormones
glutamic acid and aspartic acid
isomers
41. PH at which the amino acid has a net neutral charge
stereoisomers
isoelectric point
maltase
glucose - beta -1 -4- glucose
42. What kind of lipids compromise the lipid bilayer?
phospholipids
lipases
anomers
cysteine and methionine
43. Characteristics of hydrophobic amino acids
have alkyl or aromatic side chains and tend to associate w/ each other - rather than water
peptide bonds and disulfide bonds
primary structure
glycine - alanine - valine - methionine - leucine - isoleucine - proline - phenylalanine - tryptophan
44. Amino group placed on the right of a fischer projection is a?
lipases
stereoisomers
D- amino acid
ketose
45. Physiological pH
phospholipids
7.4
glutamic acid and aspartic acid
isomers
46. Energy storage molecule of carbohydrates for animals
glycogen
unsaturated fatty acid
saturated fatty acid
Characteristics of the peptide bond
47. 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)
aldose
cysteine and methionine
absolute configuration
quaternary structure
48. Structure where H bonds occur btw residues distant from each other - or on a separate chain. backbone is extended rather than coiled
anomers
secondary structure
have acidic carboxylic acid on side chains - w/ pKa around 4
Beta pleated sheet
49. Glycosidic linkage of cellulose
secondary structure
van der Waal forces of hydrophobic tails
maltase
glucose - beta -1 -4- glucose
50. What stabilizes lipid bilayer?
anomeric carbon
pyranose
L- configuration
van der Waal forces of hydrophobic tails