Question 1

Which of the following link photosynthesis and carbon dioxide fixation?

Accepted Answer

A)  ATP:ADP and NADP+:NADPH 
B)  ATP:ADP and NAD+:NADH 
C)  NTP:NDP 
D)  none of these 
A)  ATP:ADP and NADP+:NADPH 
B)  ATP:ADP and NAD+:NADH 
C)  NTP:NDP 
D)  none of these

Question 2

Fine tuning of the hormone process is done by such mechanisms as using other hormones to cause the release of the final active hormone.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is not a strategy for the regulation of metabolic pathways?

Accepted Answer

A)  competing pathways are located in the same organelle 
B)  allosteric enzymes 
C)  feedback inhibition 
D)  covalent modification of enzymes 
A)  competing pathways are located in the same organelle 
B)  allosteric enzymes 
C)  feedback inhibition 
D)  covalent modification of enzymes

Question 4

Dietary supplements are sometimes indicated for which of the following minerals?

Accepted Answer

A)  calcium 
B)  chloride 
C)  potassium 
D)  sodium 
A)  calcium 
B)  chloride 
C)  potassium 
D)  sodium

Question 5

Most hormones accomplish their activity by direct inclusion in the cell,where they carry out their catalytic function.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is a water-soluble vitamin?

Accepted Answer

A)  A 
B)  B6 
C)  D 
D)  E 
A)  A 
B)  B6 
C)  D 
D)  E

Question 7

When cyclic AMP is a second messenger

Accepted Answer

A)  cyclic AMP inhibits a protein kinase 
B)  the binding of hormone produces the desired effect in the cell by stimulating the production of cyclic AMP 
C)  the G protein plays no role 
D)  a target enzyme is phosphorylated with cyclic AMP as the source of the phosphate group 
A)  cyclic AMP inhibits a protein kinase 
B)  the binding of hormone produces the desired effect in the cell by stimulating the production of cyclic AMP 
C)  the G protein plays no role 
D)  a target enzyme is phosphorylated with cyclic AMP as the source of the phosphate group

Question 8

Which of the following statements concerning iron deficiency in humans is false?

Accepted Answer

A)  Iron requires a carrier molecule for absorption and transport. 
B)  Iron can only be absorbed in the iron (III) state. 
C)  Iron often forms insoluble complexes with other food substances. 
D)  Other ions may compete with iron for uptake into the body. 
A)  Iron requires a carrier molecule for absorption and transport. 
B)  Iron can only be absorbed in the iron (III) state. 
C)  Iron often forms insoluble complexes with other food substances. 
D)  Other ions may compete with iron for uptake into the body.

Question 9

Which of these hormones regulates the level of glucose in human blood?

Accepted Answer

A)  insulin 
B)  glucagon 
C)  glucagon and epinephrine 
D)  insulin and glucagon 
E)  insulin, glucagon and epinephrine 
A)  insulin 
B)  glucagon 
C)  glucagon and epinephrine 
D)  insulin and glucagon 
E)  insulin, glucagon and epinephrine

Question 10

Which of the following statements is not a characteristic of aerobic catabolism?

Accepted Answer

A)  molecular oxygen is the final electron acceptor 
B)  the oxidation of acetyl groups in the citric acid cycle and oxidative phosphorylation pathways ultimately yields CO2 and H2O 
C)  pyruvate and acetyl-CoA are major metabolic intermediates 
D)  roughly equal quantities of energy are produced in each of the three stages of aerobic catabolism, namely glycolysis, the citric acid cycle, and oxidative phosphorylation 
A)  molecular oxygen is the final electron acceptor 
B)  the oxidation of acetyl groups in the citric acid cycle and oxidative phosphorylation pathways ultimately yields CO2 and H2O 
C)  pyruvate and acetyl-CoA are major metabolic intermediates 
D)  roughly equal quantities of energy are produced in each of the three stages of aerobic catabolism, namely glycolysis, the citric acid cycle, and oxidative phosphorylation

Question 11

Which pathway is central to virtually all living organisms?

Accepted Answer

A)  glycolysis. 
B)  citric acid cycle 
C)  electron transport chain 
D)  photosynthesis 
E)  fatty acid metabolism 
A)  glycolysis. 
B)  citric acid cycle 
C)  electron transport chain 
D)  photosynthesis 
E)  fatty acid metabolism

Question 12

Steroid hormones affect which of the following?

Accepted Answer

A)  carbohydrate metabolism. 
B)  inflammatory and stress reactions. 
C)  sexual development. 
D)  All of these 
A)  carbohydrate metabolism. 
B)  inflammatory and stress reactions. 
C)  sexual development. 
D)  All of these

Question 13

Proteins eaten in excess can be stored to satisfy future protein requirements.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not true concerning leptin?

Accepted Answer

A)  It is a hormone related to obesity 
B)  It stimulates acetyl-CoA carboxylase 
C)  It stimulates fatty acid oxidation 
D)  It is produced by the ob gene 
E)  all of these are true 
A)  It is a hormone related to obesity 
B)  It stimulates acetyl-CoA carboxylase 
C)  It stimulates fatty acid oxidation 
D)  It is produced by the ob gene 
E)  all of these are true

Question 15

Which of the following compounds does not overlap between several pathways?

Accepted Answer

A)  Acetyl-CoA 
B)  Oxaloacetate 
C)  Cholesterol 
D)  Pyruvate 
A)  Acetyl-CoA 
B)  Oxaloacetate 
C)  Cholesterol 
D)  Pyruvate

Question 16

Sweets and fats are at the top of the food pyramid,because they are so important in our diet.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is not a characteristic of catabolic pathways?

Accepted Answer

A)  ATP is generated by catabolism 
B)  reducing equivalents are most often released in the form of hydrogen atoms 
C)  NAD+ is one of the major electron carriers in catabolic reactions 
D)  NADH produced in catabolic reactions is reoxidized to NAD+ in the mitochondria 
A)  ATP is generated by catabolism 
B)  reducing equivalents are most often released in the form of hydrogen atoms 
C)  NAD+ is one of the major electron carriers in catabolic reactions 
D)  NADH produced in catabolic reactions is reoxidized to NAD+ in the mitochondria

Question 18

The G protein

Accepted Answer

A)  is a tetramer 
B)  is inactivated by cholera toxin 
C)  mediates the production of second messenger 
D)  is a hexameric complex in the cytosol 
A)  is a tetramer 
B)  is inactivated by cholera toxin 
C)  mediates the production of second messenger 
D)  is a hexameric complex in the cytosol

Question 19

Which of the following is a second messenger?

Accepted Answer

A) Cyclic AMP 
B) GTP-binding proteins. 
C) Proteins kinases. 
D) Phospholipase C. 
E) All of these can act as second messengers. 
A) Cyclic AMP 
B) GTP-binding proteins. 
C) Proteins kinases. 
D) Phospholipase C. 
E) All of these can act as second messengers.

Question 20

Trophic hormones act on

Accepted Answer

A)  specific endocrine glands. 
B)  liver cells. 
C)  muscles cells. 
D)  all of the above. 
A)  specific endocrine glands. 
B)  liver cells. 
C)  muscles cells. 
D)  all of the above.

Exam 24: Integration of Metabolism: Cellular Signaling

Which of the following link photosynthesis and carbon dioxide fixation?

Fine tuning of the hormone process is done by such mechanisms as using other hormones to cause the release of the final active hormone.

Which of the following is not a strategy for the regulation of metabolic pathways?

Dietary supplements are sometimes indicated for which of the following minerals?

Most hormones accomplish their activity by direct inclusion in the cell,where they carry out their catalytic function.

Which of the following is a water-soluble vitamin?

When cyclic AMP is a second messenger

Which of the following statements concerning iron deficiency in humans is false?

Which of these hormones regulates the level of glucose in human blood?

Which of the following statements is not a characteristic of aerobic catabolism?

Which pathway is central to virtually all living organisms?

Steroid hormones affect which of the following?

Proteins eaten in excess can be stored to satisfy future protein requirements.

Which of the following is not true concerning leptin?

Which of the following compounds does not overlap between several pathways?

Sweets and fats are at the top of the food pyramid,because they are so important in our diet.

Which of the following is not a characteristic of catabolic pathways?

The G protein

Which of the following is a second messenger?

Trophic hormones act on

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

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