Question 1

Which is NOT true about fatty acid synthesis?

Accepted Answer

A) takes place in the cytosol of cells 
B) results in molecules with an even number of carbon atoms only 
C) requires more energy than is produced by the catabolism of the same fatty acid 
D)  begins with a molecule of actetyl coenzyme A 
E)  The enzymes that catalyze it are in the same location as those that mediate fatty acid catabolism. 
A) takes place in the cytosol of cells 
B) results in molecules with an even number of carbon atoms only 
C) requires more energy than is produced by the catabolism of the same fatty acid 
D)  begins with a molecule of actetyl coenzyme A 
E)  The enzymes that catalyze it are in the same location as those that mediate fatty acid catabolism.

Question 2

The deletion of a single base in a gene would alter the structure of the gene's protein more than the substitution of one base for another.

Accepted Answer

A) True 
 B)False

Question 3

The special functions of plasma and organelle membranes depend primarily on the specific composition of the phospholipids of those membranes.

Accepted Answer

A) True 
 B)False

Question 4

There are twenty different molecules of tRNA.

Accepted Answer

A) True 
 B)False

Question 5

The probability of a reaction occurring is increased

Accepted Answer

A) by decreasing reactant concentrations. 
B) by increasing the activation energy. 
C) by increasing the concentration of any of the products. 
D) if the reaction uses a great deal of energy. 
E) if the concentration of one of the reactants increases. 
A) by decreasing reactant concentrations. 
B) by increasing the activation energy. 
C) by increasing the concentration of any of the products. 
D) if the reaction uses a great deal of energy. 
E) if the concentration of one of the reactants increases.

Question 6

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

Accepted Answer

A) It is likely to be the slowest reaction in the pathway,and it is always the last step in a metabolic pathway. 
B) It is likely to be the fastest reaction in the pathway,and it is always the last step in a metabolic pathway. 
C) It is always the first step in the pathway,and may be subject to end-product inhibition. 
D) It is likely to be the slowest reaction in the pathway and it may be subject to end-product inhibition. 
E) It is likely to be the fastest reaction in the pathway and it may be subject to end-product inhibition. 
A) It is likely to be the slowest reaction in the pathway,and it is always the last step in a metabolic pathway. 
B) It is likely to be the fastest reaction in the pathway,and it is always the last step in a metabolic pathway. 
C) It is always the first step in the pathway,and may be subject to end-product inhibition. 
D) It is likely to be the slowest reaction in the pathway and it may be subject to end-product inhibition. 
E) It is likely to be the fastest reaction in the pathway and it may be subject to end-product inhibition.

Question 7

The consequences of mutations are invariably harmful.

Accepted Answer

A) True 
 B)False

Question 8

Ribosomes transcribe DNA into RNA.

Accepted Answer

A) True 
 B)False

Question 9

Substrate-level phosphorylation takes place in the ribosomes of cells,whereas oxidative phosphorylation takes place in mitochondria.

Accepted Answer

A) True 
 B)False

Question 10

Enzymes

Accepted Answer

A) are catalysts in chemical reactions. 
B) can be carbohydrate molecules. 
C) are broken down during chemical reactions they catalyze. 
D) have names generally ending in the suffix "-ose." 
E) are polymers of ATP that store large amounts of energy. 
A) are catalysts in chemical reactions. 
B) can be carbohydrate molecules. 
C) are broken down during chemical reactions they catalyze. 
D) have names generally ending in the suffix "-ose." 
E) are polymers of ATP that store large amounts of energy.

Question 11

The nucleotide triplet in tRNA that base-pairs with a complementary triplet in mRNA is called the codon.

Accepted Answer

A) True 
 B)False

Which is NOT true about fatty acid synthesis?

The deletion of a single base in a gene would alter the structure of the gene's protein more than the substitution of one base for another.

The special functions of plasma and organelle membranes depend primarily on the specific composition of the phospholipids of those membranes.

There are twenty different molecules of tRNA.

The probability of a reaction occurring is increased

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

The consequences of mutations are invariably harmful.

Ribosomes transcribe DNA into RNA.

Substrate-level phosphorylation takes place in the ribosomes of cells,whereas oxidative phosphorylation takes place in mitochondria.

Enzymes

The nucleotide triplet in tRNA that base-pairs with a complementary triplet in mRNA is called the codon.

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Movement of Molecules Across Cell Membranes

Control of Cells by Chemical Messengers

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

Filters

Exam 3: Cellular Structure, Proteins, and Metabolism

Which is NOT true about fatty acid synthesis?

The deletion of a single base in a gene would alter the structure of the gene's protein more than the substitution of one base for another.

The special functions of plasma and organelle membranes depend primarily on the specific composition of the phospholipids of those membranes.

There are twenty different molecules of tRNA.

The probability of a reaction occurring is increased

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

The consequences of mutations are invariably harmful.

Ribosomes transcribe DNA into RNA.

Substrate-level phosphorylation takes place in the ribosomes of cells,whereas oxidative phosphorylation takes place in mitochondria.

Enzymes

The nucleotide triplet in tRNA that base-pairs with a complementary triplet in mRNA is called the codon.

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Movement of Molecules Across Cell Membranes

Control of Cells by Chemical Messengers

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

Filters