Question 1

A phosphate ester contains a phosphate functional group.

Accepted Answer

A) True 
 B)False

Question 2

All cells have kept the same general patterns of metabolism,a very similar genetic code and the same monomers or residues.

Accepted Answer

A) True 
 B)False

Question 3

The role of DNA as the genetic material was confirmed by transforming Streptococci in experiments performed several years after the famous Watson and Crick description of DNA structure.

Accepted Answer

A) True 
 B)False

Question 4

Sugars with six carbons are the only ones capable of forming a ring structure as shown in a Haworth projection.

Accepted Answer

A) True 
 B)False

Question 5

Prokaryotes are valuable tools for biochemists because

Accepted Answer

A) E.coli is well-studied and typical of prokaryotes. 
B) they contain as many genes as eukaryotic cells. 
C) many of their chromosomes are sequenced. 
D) they are not very diverse organisms. 
E) All of the above 
A) E.coli is well-studied and typical of prokaryotes. 
B) they contain as many genes as eukaryotic cells. 
C) many of their chromosomes are sequenced. 
D) they are not very diverse organisms. 
E) All of the above

Question 6

Water is often a product when monomers join to form a macromolecule.

Accepted Answer

A) True 
 B)False

Question 7

The nuclear envelope is a membrane that surrounds the nucleus and is continuous with the endoplasmic reticulum.

Accepted Answer

A) True 
 B)False

Question 8

A dipeptide forms when a functional ________ group of one amino acid reacts with the functional ________ group of another amino acid to form a ________ bond.

Accepted Answer

A) carboxylate,amino,double 
B) carboxylate,amino,enzyme 
C) amino,carboxylate,phosphate 
D) amino,carboxylate,peptide 
A) carboxylate,amino,double 
B) carboxylate,amino,enzyme 
C) amino,carboxylate,phosphate 
D) amino,carboxylate,peptide

Question 9

Which cellular component carries out oxidation reactions,some of which produce hydrogen peroxide?

Accepted Answer

A) Peroxisomes. 
B) Mitochondria. 
C) Chloroplasts. 
D) Lysosomes. 
E) Vacuoles. 
A) Peroxisomes. 
B) Mitochondria. 
C) Chloroplasts. 
D) Lysosomes. 
E) Vacuoles.

Question 10

Which functional group is shown?

Accepted Answer

A) Primary amine. 
B) Acyl. 
C) Amide. 
D) Anhydride. 
E) Nitrile. 
A) Primary amine. 
B) Acyl. 
C) Amide. 
D) Anhydride. 
E) Nitrile.

Question 11

Lipids aggregate to form bilayers because some lipid molecules are hydrophobic and other lipid molecules are hydrophilic.

Accepted Answer

A) True 
 B)False

Question 12

Which statement is true about the Gibb's free energy of a reaction?

Accepted Answer

A) It is dependent on the concentrations of both products and reactants. 
B) It is dependent only on the concentrations of the reactants. 
C) It is dependent only on the concentrations of the products. 
D) It is not dependent on the concentrations of either the products or reactants. 
A) It is dependent on the concentrations of both products and reactants. 
B) It is dependent only on the concentrations of the reactants. 
C) It is dependent only on the concentrations of the products. 
D) It is not dependent on the concentrations of either the products or reactants.

Question 13

Sugars such as glucose are monomers of polysaccharides that are linked together when covalent bonds form between one ________ group of one sugar to the same group on another sugar.

Accepted Answer

A) ester 
B) carboxyl 
C) amino 
D) hydroxyl 
A) ester 
B) carboxyl 
C) amino 
D) hydroxyl

Question 14

Chloroplasts are organelles found in plants,algae and some protists and are the site of photosynthesis.

Accepted Answer

A) True 
 B)False

Question 15

Which statement about cellulose is false?

Accepted Answer

A) It is the most abundant polysaccharide in nature. 
B) Its monomers are joined by glycosidic bonds. 
C) It is present in the stems of flowering plants. 
D) The hydroxyl groups of neighboring cellulose molecules interact to form strong,insoluble fibers. 
E) It is a branched polymer of glucose. 
A) It is the most abundant polysaccharide in nature. 
B) Its monomers are joined by glycosidic bonds. 
C) It is present in the stems of flowering plants. 
D) The hydroxyl groups of neighboring cellulose molecules interact to form strong,insoluble fibers. 
E) It is a branched polymer of glucose.

Question 16

Which statement is true about a reaction with an equilibrium constant,Keq,equal to 1000?

Accepted Answer

A) The forward rate constant is 1000 times greater than the reverse rate constant. 
B) The forward rate constant is 3 times greater than reverse rate constant. 
C) The forward rate constant is 1000 times smaller than the reverse rate constant. 
D) The forward rate constant is 3 times smaller than the reverse rate constant. 
E) There is not enough information given to compare the forward and reverse rate constants. 
A) The forward rate constant is 1000 times greater than the reverse rate constant. 
B) The forward rate constant is 3 times greater than reverse rate constant. 
C) The forward rate constant is 1000 times smaller than the reverse rate constant. 
D) The forward rate constant is 3 times smaller than the reverse rate constant. 
E) There is not enough information given to compare the forward and reverse rate constants.

Question 17

Biochemists describing the molecular weight of a protein really mean the atomic weight in grams.

Accepted Answer

A) True 
 B)False

Question 18

The diffusion of large molecules such as enzymes is significantly slowed by the presence of the cytoskeleton.

Accepted Answer

A) True 
 B)False

Question 19

Enzymes are not as efficient as most catalysts used in organic chemistry,since they must function at body temperature.

Accepted Answer

A) True 
 B)False

Question 20

The tendency of a metabolic reaction to proceed is due to the free energy of both the reactants and products as well as the change in randomness of that reaction.

Accepted Answer

A) True 
 B)False

Exam 1: Introduction to Biochemistry

A phosphate ester contains a phosphate functional group.

All cells have kept the same general patterns of metabolism,a very similar genetic code and the same monomers or residues.

The role of DNA as the genetic material was confirmed by transforming Streptococci in experiments performed several years after the famous Watson and Crick description of DNA structure.

Sugars with six carbons are the only ones capable of forming a ring structure as shown in a Haworth projection.

Prokaryotes are valuable tools for biochemists because

Water is often a product when monomers join to form a macromolecule.

The nuclear envelope is a membrane that surrounds the nucleus and is continuous with the endoplasmic reticulum.

A dipeptide forms when a functional ________ group of one amino acid reacts with the functional ________ group of another amino acid to form a ________ bond.

Which cellular component carries out oxidation reactions,some of which produce hydrogen peroxide?

Which functional group is shown?

Lipids aggregate to form bilayers because some lipid molecules are hydrophobic and other lipid molecules are hydrophilic.

Which statement is true about the Gibb's free energy of a reaction?

Sugars such as glucose are monomers of polysaccharides that are linked together when covalent bonds form between one ________ group of one sugar to the same group on another sugar.

Chloroplasts are organelles found in plants,algae and some protists and are the site of photosynthesis.

Which statement about cellulose is false?

Which statement is true about a reaction with an equilibrium constant,Keq,equal to 1000?

Biochemists describing the molecular weight of a protein really mean the atomic weight in grams.

The diffusion of large molecules such as enzymes is significantly slowed by the presence of the cytoskeleton.

Enzymes are not as efficient as most catalysts used in organic chemistry,since they must function at body temperature.

The tendency of a metabolic reaction to proceed is due to the free energy of both the reactants and products as well as the change in randomness of that reaction.

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

A dipeptide forms when a functional group of one amino acid reacts with the functional group of another amino acid to form a bond.