BIOCHEMISTRY

All of the chemical compounds are organic EXCEPT which? a) Na2 S2 O3 b) CH4 c) (CH2OH)2 d) (NH2)2 CO e) C6 H5 OH

A

All of the following are carbohydrates EXCEPT: a) glycerol b) glycogen c) amylose d) chitin e) polysaccharide

A

Amylase is an enzyme important in the digestion of starches. What kind of organic macromolecule is amylase? a) protein b) carbohydrate c) lipid d) nucleic acid e) phospholipid

A

For questions 28-31, choose the molecule that best fits the descriptions below. (SEE PICTURES) 29. Not an organic molecule

A

choose functional group that best corresponds to the description below a) R - OH b) R - COOH c) R - NH2 d) R - CHO e) R - CO - R 7. Alcohol

A

for questions 38-41, choose the molecule that best corresponds to description below (see pictures) 38. Monosaccharide

A

34. SAME AS 27. Alpha helix and pleated sheets question

B

Alpha helices and beta pleated sheets are examples of: a) primary protein structure b) secondary protein structure c) tertiary protein structure d) quaternary protein structure

B

Fatty acids and glycerol are to simple lipids as: a) Monosaccharides are to polypeptides b) Amino acids are to proteins c) glucose is to glycerol d) adenine is to thymine e) nucleotides are to amino acids

B

For questions 28-31, choose the molecule that best fits the descriptions below. (SEE PICTURES) 30. Pentane

B

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 42. Used for thermal insulation in mammals

B

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 43. Main constituent of cell membranes

B

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 47. Cholesterol, Testosterone, Estrogen

B

In the polypeptide below, which best represents the peptide bond formed by dehydration synthesis? (SEE CHART)

B

The monosaccharide products of a lactose hydrolysis would be a) fructose and maltose b) galactose and glucose c) glucose and fructose d) glucose and glucose e) sucrose and fructose

B

The myoglobin protein, which carries oxygen in muscle cells has only the first three levels of protein structure. In other words, it lacks a quaternary level. From this, you can conclude that myoglobin: a) is made of nucleic acids b) is made of only one polypeptide chain c) lacks hydrogen bonds d) is not helical or pleated e) is a fibrous protein

B

choose functional group that best corresponds to the description below a) R - OH b) R - COOH c) R - NH2 d) R - CHO e) R - CO - R 6. Found in both fatty acids and amino acids

B

for questions 38-41, choose the molecule that best corresponds to description below (see pictures) 39. Amino Acid

B

33. Unlike saturated fatty acids, unsaturated fatty acids: a) are solid at room temperature b) pack more tightly together because they have straight chains c) have one or more double bond in their hydrocarbon chain d) have the maximum number of hydrogen atoms possible for that hydrocarbon chain e) are predominately found in animal fats and oils

C

A benzene ring (also know as a hexene) is a common organic molecular structure. It is composed of: a) seven carbon atoms single bonded together b) six carbon atoms single bonded together c) six carbon atoms double bonded together d) six carbon atoms triple bonded together e) five carbon atoms double bonded together

C

All of the following are true for cellulose, chitin, glycogen, and starch EXCEPT: a) They are all polymers b) They are all carbohydrates c) They are all found in cell walls d) They all contain glycosidic linkages e) They all contain monomers of glucose or modified glucose

C

For questions 28-31, choose the molecule that best fits the descriptions below. (SEE PICTURES) 32. Nucleotide

C

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 44. Contains ribose or deoxyribose, a phosphate, and one of five nitrogenous bases

C

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 46. Stores genetic information

C

Which of the follow best corresponds to the four levels of protein structure, moving from primary to quaternary structure? a) Polypeptide folds, aggregation of polypeptide subunits, side-chain bonding, sequence of amino acids b) Polypeptide folds, side-chain bonding, sequence of amino acids, aggregation of polypeptide subunits c) Sequence of amino acids, side-chain bonding, polypeptide folds, aggregation of polypeptide subunits d) Sequence of amino acids, polypeptide folds, side-chain bonding, aggregation of polypeptide subunits e) Sequence of amino acids, aggregation of polypeptide subunits, polypeptide folds, side-chain bonding

C

Which organic molecule could contain sulfur? a) Carbohydrates b) Lipids c) Proteins d) Nucleic Acids e) Steroids

C

choose functional group that best corresponds to the description below a) R - OH b) R - COOH c) R - NH2 d) R - CHO e) R - CO - R 8. Found in urea and amino acids

C

for questions 38-41, choose the molecule that best corresponds to description below (see pictures) 41. Steroid

C

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 45. Glycosidic linkages

D

In humans, short-term energy supplies are stored as glycogen and long-term energy supplies are store as fats. Which of the following best explain(s) this phenomenon? I. Carbohydrate are more readily soluble in water than lipids II. Lipids are more easily broken down by the cells than carbohydrates III. Glycogen is more readily converted to glucose than is fat. a) only I is correct b) only II is correct c) only III is correct d) I and III are both correct e) All of the statements above are correct

D

Twenty different amino acids are found in the protein of cells. What distinguishes the difference these molecules? a) the location of their carboxyl group b) the location of their amino group c) the presence or absence of an alpha carbon d) the composition of their side chains, or R - groups e) their ability to form peptide bonds

D

Which element is found the least in your body? a) Oxygen b) Hydrogen c) Carbon D) Potassium e) Nitrogen

D

Which functional group is NOT found on this molecule? (see picture) a) carboxyl b) hydroxyl c) amino d) sulfhydryl

D

Which of the following hydrocarbons is an alkene? a) C3 H8 b) CH4 c) C2 H6 d) C2 H4 e) C2 H2

D

Which of the following molecules is amphipathic, having both hydrophilic and hydrophobic regions? a) glucose b) glycogen c) cellulose d) phospholipid e) protein

D

Cellulose, a complex carbohydrate found in plant cell walls, is the most abundant polymer on Earth. Which of the following materials would you expect to contain cellulose? I. Cotton II. Wood III. Cork a) only I is correct b) only II is correct c) only III is correct d) I and III are both correct e) All of the statements above are correct

E

Egg whites contain large amounts of the protein albumin, which looks clear when uncooked eggs are opened. Cooking the whites at high temperatures changes the structural shape of the albumin, turning the "whites" white. Which term correctly identifies this process or proteins losing their confirmation? a) Hydrolysis b) Saturation c) Synthesis d) Posttransitional modification e) Denaturation

E

For questions 28-31, choose the molecule that best fits the descriptions below. (SEE PICTURES) 28. Result of polymerization

E

For questions 42-45, choose the macromolecule that best corresponds to the description below. a) Protein b) Lipid c) Nucleic Acid d) Carbohydrate e) Water 48. Most abundant molecule in living organisms

E

Jamie has dry skin, so she uses body oil every morning. The oil seals in some of the water on her skin, so that it does not get as dry. This is possible because oils: a) are hydrophilic b) are rare in nature c) have a high specific heat d) are more dense than water e) are hydrophobic

E

When you eat foods rich in starch, salivary enzymes break it down into maltose. Eventually, the maltose enters your small intestine, where it is further broken down into glucose, which is absorbed into the blood stream. Starch is considered a ______________, maltose is a _______________, and glucose is a ________________. a) protein, dipeptide, amino acid b) monosaccharide, disaccharide, polysaccharide c) triglyceride, fatty acid, glycerol d) amino acid, dipeptide, protein e) polysaccharide, disaccharide, monosaccharide

E

Which is NOT a characteristic of proteins? a) can functions as enzymes b) contain peptide bonds c) are important in cell signaling d) made up of amino acids e) contains nitrogen bases

E

Which of the following statements is FALSE regarding carbon? a) Carbon has a tendency to form covalent bonds b) Carbon has the ability to bond with up to four different atoms c) Carbon has the capacity to form double and triple bonds d) Carbon atoms can bond together to form extensive and branched molecular chains e) Carbon has the capacity to form polar bonds with hydrogen

E

Which of the functional groups below represents an aldehyde? SEE PICTURE

E

With regard to relative size, arrange (from smallest to largest) the following: 1. electron 2. nucleic acid molecule 3. carbon atom 4. fructose molecule 5. water molecules a) 2-4-3-5-1 b) 1-3-4-5-2 c) 1-3-5-4-2 d) 3-1-4-2-5 e) 1-3-5-2-4

E

choose functional group that best corresponds to the description below a) R - OH b) R - COOH c) R - NH2 d) R - CHO e) R - CO - R 9. Ketone

E

for questions 38-41, choose the molecule that best corresponds to description below (see pictures) 40. Triglyceride

E