Question 1

The mitochondria and Golgi apparatus are two organelles which originated from bacteria and were incorporated into eukaryotic cells via symbiosis.

Accepted Answer

A) True 
 B)False  False

Question 2

Eukaryotic cells are distinguished from prokaryotes by their usually larger size,a complex cytoskeleton and membrane-bounded organelles.

Accepted Answer

A) True 
 B)False  True

Question 3

The absolute molecular mass of macromolecules is given in daltons,where 1 dalton = 1 atomic mass unit.

Accepted Answer

A) True 
 B)False  True

Question 4

The filament fibers in the cytoskeleton are composed primarily of carbohydrate molecules.

Accepted Answer

A) True 
 B)False

Question 5

A spontaneous chemical reaction always has a ________ change.

Accepted Answer

A) positive Gibb's free energy 
B) negative Gibb's free energy 
C) positive enthalpy 
D) negative enthalpy 
E) positive entropy 
A) positive Gibb's free energy 
B) negative Gibb's free energy 
C) positive enthalpy 
D) negative enthalpy 
E) positive entropy

Question 6

A peptide bond is formed by the condensation of different functional groups from two amino acids.

Accepted Answer

A) True 
 B)False

Question 7

The Golgi apparatus consists of flattened,fluid-filled,membranous sacs and is responsible for chemical modification and sorting of some biomolecules.

Accepted Answer

A) True 
 B)False

Question 8

ATP contains both phosphoester and phosphoanhydride linkages.

Accepted Answer

A) True 
 B)False

Question 9

The mitotic spindles are formed from microtubule proteins.

Accepted Answer

A) True 
 B)False

Question 10

Most of the energy required for life on Earth is supplied by ________.

Accepted Answer

A) geothermal energy 
B) the sun 
C) cosmic radiation 
D) the conversion of ADP to ATP 
E) mechanical energy 
A) geothermal energy 
B) the sun 
C) cosmic radiation 
D) the conversion of ADP to ATP 
E) mechanical energy

Question 11

One Angstrom is equal to 1 × 10-10 meters.

Accepted Answer

A) True 
 B)False

Question 12

All prokaryotic cells are about 1/10 the size of an average eukaryotic cell or smaller.

Accepted Answer

A) True 
 B)False

Question 13

In an animal cell,DNA can be found only in the nucleus.

Accepted Answer

A) True 
 B)False

Question 14

The chemical name for ATP is alanine triphosphate.

Accepted Answer

A) True 
 B)False

Question 15

Why is it important that the enzymes in lysosomes are more active at acidic pH than at neutral pH?

Accepted Answer

A) Since lysosomes are primarily found in the stomach acid of mammals,their pH dependence allows for maximum efficiency for the digestion of foodstuffs. 
B) It prevents their diffusion out of the lysosomes. 
C) It maximizes the interaction with their substrates which are always bases. 
D) It prevents them from accidentally degrading the macromolecules in the cytosol. 
E) It allows for regulation of their uptake by the mitochondria. 
A) Since lysosomes are primarily found in the stomach acid of mammals,their pH dependence allows for maximum efficiency for the digestion of foodstuffs. 
B) It prevents their diffusion out of the lysosomes. 
C) It maximizes the interaction with their substrates which are always bases. 
D) It prevents them from accidentally degrading the macromolecules in the cytosol. 
E) It allows for regulation of their uptake by the mitochondria.

Question 16

Mitochondria are the main sites of energy transduction in aerobic eukaryotic cells.

Accepted Answer

A) True 
 B)False

Question 17

Thermodynamics and its laws are obeyed by living cells.

Accepted Answer

A) True 
 B)False

Question 18

Biochemical reactions are more likely to proceed if the reaction has an increase in enthalpy (△H)and a decrease in entropy

Accepted Answer

A) True 
 B)False

Question 19

When Keq of a reaction = 1,then

Accepted Answer

A) the forward reaction is faster than the reverse reaction. 
B) the reverse reaction is faster than the forward reaction. 
C) the forward and reverse reaction rate constants are equal. 
D) more products are formed than reactants. 
E) fewer products are formed than reactants. 
A) the forward reaction is faster than the reverse reaction. 
B) the reverse reaction is faster than the forward reaction. 
C) the forward and reverse reaction rate constants are equal. 
D) more products are formed than reactants. 
E) fewer products are formed than reactants.

Question 20

Which linkage(s)occur extensively in nucleotides?

Accepted Answer

A) Amide. 
B) Phosphoanhydride. 
C) Phosphate ester. 
D) Ether. 
E) Both B and C above. 
A) Amide. 
B) Phosphoanhydride. 
C) Phosphate ester. 
D) Ether. 
E) Both B and C above.

Exam 1: Introduction to Biochemistry

The mitochondria and Golgi apparatus are two organelles which originated from bacteria and were incorporated into eukaryotic cells via symbiosis.

Eukaryotic cells are distinguished from prokaryotes by their usually larger size,a complex cytoskeleton and membrane-bounded organelles.

The absolute molecular mass of macromolecules is given in daltons,where 1 dalton = 1 atomic mass unit.

The filament fibers in the cytoskeleton are composed primarily of carbohydrate molecules.

A spontaneous chemical reaction always has a ________ change.

A peptide bond is formed by the condensation of different functional groups from two amino acids.

The Golgi apparatus consists of flattened,fluid-filled,membranous sacs and is responsible for chemical modification and sorting of some biomolecules.

ATP contains both phosphoester and phosphoanhydride linkages.

The mitotic spindles are formed from microtubule proteins.

Most of the energy required for life on Earth is supplied by ________.

One Angstrom is equal to 1 × 10-10 meters.

All prokaryotic cells are about 1/10 the size of an average eukaryotic cell or smaller.

In an animal cell,DNA can be found only in the nucleus.

The chemical name for ATP is alanine triphosphate.

Why is it important that the enzymes in lysosomes are more active at acidic pH than at neutral pH?

Mitochondria are the main sites of energy transduction in aerobic eukaryotic cells.

Thermodynamics and its laws are obeyed by living cells.

Biochemical reactions are more likely to proceed if the reaction has an increase in enthalpy (△H)and a decrease in entropy

When Keq of a reaction = 1,then

Which linkage(s)occur extensively in nucleotides?

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

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