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75 Cards in this Set
- Front
- Back
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The configuration at which carbon of a tetrose determines if the tetrose has the D or L configuration?
a. C-1 b. C-2 c. C-3 d. C-4 |
c.
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5. The configuration at which carbon of a pentose determines if the pentose has the D or L configuration?
a. C-1 b. C-3 c. C-4 d. C-5 |
c
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How many chiral carbons are present in the open-chain chain form of an aldohexose?
a. 3 b. 4 c. 5 d. 6 |
b
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. Which of the following occurs when a monosaccharide is converted to an amino sugar?
a. an amino group replaces an aldehyde carbonyl b. an amino group replaces a ketone carbonyl c. an amino group replaces a hydroxyl group d. any of the above, it depends on the identity of the monosaccharide |
c
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How many amino sugars are common in nature?
a. 1 b. 2 c. 3 d. 4 |
c
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The D- form of which of the following amino sugars is not commonly found naturally?
a. galactosamine b. glucosamine c. mannosamine d. ribosamine |
d
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Which of the following is a generally mild disease?
a. galactosemia c. both (a) and (b) b. galactosuria d. neither (a) nor (b) |
b
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Which of following describes a solution in which the and anomers of glucose have reached equilibrium?
a. there is more anomer present than anomer b. the solution shows no optical activity c. both (a) and (b) d. neither (a) nor (b) |
d
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. Which of the following is true of the spatial distribution of the hydroxyl groups of -D-glucopyranose?
a. they are all in axial positions b. they are all in equatorial positions c. the hydroxyl on C-1 is axial, those on C-2, C-3 and C-4 are equatorial d. the hydroxyl on C-1 is equatorial, those on C-2, C-3 and C-4 are axial |
b
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When ribose adopts a furanose structure which carbon is the anomeric carbon?
a. C-1 b. C-2 c. C-5 d. C-6 |
b
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When glucose adopts a pyranose structure which carbon is the anomeric carbon?
a. C-1 b. C-2 c. C-5 d. C-6 |
a
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25. . In which of the following ways do bile salts remove excess cholesterol?
a. bile salts solubilize cholesterol b. cholesterol is converted to bile salts which are then eliminated in the feces c. both (a) and (b) d. neither (a) nor (b) |
c
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In which of the following ways do bile salts remove excess cholesterol?
a. bile salts convert LDL to HDL b. cholesterol is converted to bile salts which are then eliminated in the feces c. both (a) and (b) d. neither (a) nor (b) |
b
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. How many carbon-carbon double bonds are present in arachidonic acid?
a. 1 b. 2 c. 3 d. 4 |
d
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Drugs such as Vioxx and Celebrex do which of the following?
a. cause formation of lipids which increase the risk of heart attacks b. inhibit COX-2 activity c. both (a) and (b) d. neither (a) nor (b) |
c
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Which functional group is involved in linking together the amino acids of proteins?
a. Amine b. anhydride c. carbonyl d. carboxyl |
a
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Which of the following is a structural protein?
a. Cellulose b. collagen c. hemoglobin d. insulin |
b
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Which of the following is a protein associated with the movement of muscles?
a. Actin b. ferritin c. hemoglobin d. insulin |
a
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Which of the following is a protein associated the storage of iron?
a. actin b. ferritin c. hemoglobin d. insulin |
b
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Which of the following proteins is a hormone?
a. casein b. hemoglobin c. insulin d. all of these |
c
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Which of the following is not a fibrous protein?
a. actin c. keratin b. collagen d. none, they are all fibrous proteins |
a
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What is the minimum number of carbon atoms in an -amino acid?
a. 1 b. 2 c. 3 d. 4 |
b
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In which of the following is the amino nitrogen also part of the side chain?
a. cysteine b. glycine c. proline d. tryptophan |
c
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53. Which of the following amino acids has the lowest pI?
a. arginine b. cysteine c. glycine d. glutamic acid |
b
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Which of the following amino acids is not optically active?
a. alanine c. Tryptophan b. glycine d. none of these, they are all optically active |
b
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. Which of the following is true of all -amino acids?
a. all -amino acids are also D-amino acids b. all -amino acids are also L-amino acids c. the amino group is attached to the carbon of the carboxyl group d. the amino group and the carbon of the carboxyl group are attached to the same carbon atom |
c
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In which of the following do both amino acids contain a sulfur atom?
a. cysteine and glycine c. histidine and methionine b. cysteine and methionine d. phenylalanine and tryptophan |
b
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Which of the following amino acids is easily dimerized?
a. alanine b. cysteine c. glycine d. Methionine |
b
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What type of chemical reaction is involved in the formation of disulfide bonds from thiols?
a. addition b. reduction c. oxidation d. Substitution |
c
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What type of chemical reaction is involved in the conversion of disulfide bonds to thiols?
a. addition b. reduction c. oxidation d. Substitution |
c
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What type of chemical reaction is involved in the formation of cystine from cysteine?
a. addition b. reduction c. oxidation d. Substitution |
b
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How many amino acids have acidic side chains?
a. 1 b. 2 c. 3 d. 4 |
b
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Which of the following amino acids will exist as a + 2 ion at very low pH?
a. arginine b. glutamic acid c. isoleucine d. none of these |
a
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Which of the following amino acids will exist as a -2 ion at very high pH?
a. arginine b. glutamic acid c. isoleucine d. none of these |
b
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Serotonin is formed from which amino acid?
a. phenylalanine b. tryptophan c. tyrosine d. Valine |
b
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Neurotransmitters known as catecholamines are formed from which amino acid?
a. cysteine b. threonine c. tyrosine d. Valine |
c
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Which amino acids are precursors of norepinephrine and epinephrine?
a. aspartic acid and glutamic acid c. isoleucine and leucine b. cysteine and methionine d. phenylalanine and tyrosine TOP: |
d
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Which of the following is true?
a. all enzymes are fibrous proteins b. all enzymes are globular proteins c. the majority of enzymes are fibrous proteins d. the majority of enzymes are globular proteins |
d
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Which of the following is true of enzymes?
a. they lower the activation energy for a chemical reaction b. they speed up the rate of a chemical reaction c. both (a) and (b) d. neither (a) nor (b) |
c
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Which of the following is true of trypsin?
a. it does not affect any peptide bonds b. it hydrolyzes all peptide bonds c. it hydrolyzes peptide bonds to leucine and phenylalanine d. it hydrolyzes peptide bonds to arginine and lysine |
d
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Which of following is true of urease?
a. it catalyzes the degradation of uracil c. it catalyzes the hydrolysis of urea b. it catalyzes the synthesis of urea d. it catalyzes the hydrolysis of all amines |
c
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Enzymes are classified into how many different major groups?
a. 4 b. 6 c. 8 d. 10 |
b
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78. Lactate dehydrogenase belongs to which group of enzymes?
a. hydrolases b. lyases c. Oxidoreductases d. transferases |
c
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Acetylcholinesterase belongs to which group of enzymes?
a. hydrolases b. lyases c. Oxidoreductases d. transferases |
a
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80. Aconitase belongs to which group of enzymes?
a. hydrolases b. lyases c. Oxidoreductases d. transferases |
b
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Tyrosine-tRNA synthetase belongs to which group of enzymes?
a. hydrolases b. ligases c. Oxidoreductases d. transferases |
b
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Which of the following activates the receptor sites for acetylcholine?
a. curare b. nicotine c. opiates d. none of these |
b
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Which of the following blocks the receptor sites for acetylcholine?
a. curare b. nicotine c. opiate d. none of these |
a
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89. Which of the following activates the receptor sites for enkephalins?
a. curare b. opiates c. nicotine d. none of these |
b
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Which of the following is true of a hormone?
a. it is produced at the site of its action b. it is produced at one location and then transported to its site of action c. either (a) or (b), depending on the hormone d. neither (a) nor (b) |
c
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The amino acid pool consists of which of the following?
a. the amino acids found in our diets b. the free amino acids found inside the cells c. the free amino acids found outside the cells d. both (b) and (c) |
d
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How many molecules of ATP are involved in the conversion of glucose to glucose 6-phosphate?
a. 0 b. 1 c. 2 d. 3 |
b
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Which of the following is true of glucose 6-phosphate?
a. it is found as the anomer only b. it is found as the anomer only c. it is found as a mixture of the and anomers d. there are no anomers of glucose 6-phosphate |
d
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The conversion of glyceraldehyde 3-phosphate to 1,3-bisphosphoglycerate is an example of which of the following reactions?
a. hydrolysis b. isomerization c. oxidation d. reduction |
c
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The conversion of glyceraldehyde 3-phosphate to 1,3-bisphosphoglycerate requires which of the following?
a. ADP b. ATP c. NADH d. NAD+ |
d
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The conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate produces which of the following?
a. AMP b. ADP c. ATP d. none of these |
c
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In glycerol 3-phosphate transport, found in muscle and nerve cells, how many ATP molecules are produced for each NADH + H+?
a. 1 b. 2 c. 3 d. 4 |
b
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In the transport mechanism which operates in the heart and liver, how many ATP molecules are produced for each NADH + H+?
a. 1 b. 2 c. 3 d. 4 |
c
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121. When one molecule of glucose undergoes glycolysis, two molecules of pyruvate are produced; the pyruvates then undergoes oxidative decarboxylation to yield two acetyl CoA. How many net molecules of ATP are produced by the oxidative decarboxylation of two molecules of pyruvate to yield two acetyl CoA?
a. 2 b. 4 c. 6 d. 12 |
c
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How many ATP molecules are produced as a result of the complete metabolism of one molecule of glucose in skeletal muscles?
a. 4 b. 6 c. 24 d. 36 |
d
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How many ATP molecules are produced as a result of the complete metabolism of one molecule of glucose in the heart or liver?
a. 12 b. 24 c. 36 d. 38 |
d
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How is hydrogen bonding in a tertiary structure different from a secondary structure?
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tert- stabalized by hydrogen btwn polar groups on side chains or btw side chains and peptide backbone--- secondary stabalized by hydrogen bonding btwthe backbone
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2. Hydroxylation of which amino acid produces hydroxylysine and what enzyme is involved?
a. Lysine;Prolyl lysinase b. Lysine; Lysyl hydroxylase c. Proline; Lysly hydroxylase d. Throxine; Lysly hydroxylase |
b
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dihydroxyacetone is isomerized to____
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glyceraldehyde 3-phosphate
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How many ATP molecules are produced by each glycerol molecure?
20 5 15 1 |
20
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The enzyme that catalyzes this process is carnitine____
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acyltransferase
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PPL w parkinsons depleted amounts of?
serotoine dopamine epinepharine none |
dopamine
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protein digestion occur__
mouth liver small intestines bladder |
small intestines
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human diet should contain abou t___% of proteins
12 20 90 5 |
20
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3 denaturing agent
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heat- h bonds- reducing adents- disulfide- heavy metals- disulfide
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simplest acidic polysaccharide present in connective tissues?
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hyaluronic acid
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oils have
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long unstaturated and short saturated
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it has been shown that ___ hormones interact inside the cell w protein receptors
transcription steroid glycagon oxide |
steroid
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Starch that consist of continuous, unbrached chains?
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amylose
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2. The product formed when the CHO group of a monosaccharide is reduced to a CH2OH group.
a. Uronic acid b. alditol c. aldonic acid d. phosphoric acid |
b
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