Question 1

In what way does the mitochondrial genetic code differ from the "universal" genetic code?

Accepted Answer

A)  Some codons code for different amino acids. 
B)  There are no stop codons. 
C)  It accommodates less wobble. 
D)  All of the above 
A)  Some codons code for different amino acids. 
B)  There are no stop codons. 
C)  It accommodates less wobble. 
D)  All of the above

Question 2

Which of the following phospholipids contains four fatty acid chains and is associated with a restriction in proton flow?

Accepted Answer

A)  Phosphatidylcholine 
B)  Cholesterol 
C)  Sphingolipid 
D)  Cardiolipin 
A)  Phosphatidylcholine 
B)  Cholesterol 
C)  Sphingolipid 
D)  Cardiolipin

Question 3

A deficiency in cardiolipin would lead to

Accepted Answer

A)  increased proton flow across the inner mitochondrial membrane. 
B)  decreased proton flow across the inner mitochondrial membrane. 
C)  increased proton flow across the outer mitochondrial membrane. 
D)  decreased proton flow across the outer mitochondrial membrane. 
A)  increased proton flow across the inner mitochondrial membrane. 
B)  decreased proton flow across the inner mitochondrial membrane. 
C)  increased proton flow across the outer mitochondrial membrane. 
D)  decreased proton flow across the outer mitochondrial membrane.

Question 4

The amino terminal presequence on proteins imported into the mitochondrial inner membrane is

Accepted Answer

A)  cleaved by mitochondrial matrix processing peptidase (MPP). 
B)  transported back to the intermembrane space by Hsp70 chaperones. 
C)  cleaved and translocated laterally into the inner membrane. 
D)  cleaved during transit from Tom to Tim23. 
A)  cleaved by mitochondrial matrix processing peptidase (MPP). 
B)  transported back to the intermembrane space by Hsp70 chaperones. 
C)  cleaved and translocated laterally into the inner membrane. 
D)  cleaved during transit from Tom to Tim23.

Question 5

What would be the effect of a mutation in the Tim23 complex?

Accepted Answer

Tim23 directs the translocation of polyp

Question 6

Mitochondria lacking mitochondrial DNA are soon unable to make ATP by oxidative phosphorylation.

Accepted Answer

A) True 
 B)False

Question 7

Where in mitochondria does each of the following processes or events occur?
-The citric acid cycle

Accepted Answer

The mitoch

Question 8

The chloroplast genome contains about _______ genes.

Accepted Answer

A)  20 
B)  150 
C)  1,500 
D)  3,000 
A)  20 
B)  150 
C)  1,500 
D)  3,000

Question 9

At low pH, the chemical 2,4-dinitrophenol (DNP) is neutral and can diffuse freely across membranes, including those of mitochondria. At high pH, it gives off a proton, becomes negatively charged, and can no longer diffuse across membranes. What effect would DNP have on the proton gradient between the mitochondrial intermembrane space and matrix?

Accepted Answer

DNP would dissipate the proton gradient

Question 10

Which of the following is a mitochondrial disease?

Accepted Answer

A)  Lou Gehrig's disease 
B)  Retinoblastoma 
C)  Leber's hereditary optic neuropathy 
D)  Crohn's disease 
A)  Lou Gehrig's disease 
B)  Retinoblastoma 
C)  Leber's hereditary optic neuropathy 
D)  Crohn's disease

Question 11

Which of the following contain their own genomes?

Accepted Answer

A)  Mitochondria, but not chloroplasts and peroxisomes 
B)  Chloroplasts, but not mitochondria and peroxisomes 
C)  Mitochondria and chloroplasts, but not peroxisomes 
D)  Mitochondria, chloroplasts, and peroxisomes 
A)  Mitochondria, but not chloroplasts and peroxisomes 
B)  Chloroplasts, but not mitochondria and peroxisomes 
C)  Mitochondria and chloroplasts, but not peroxisomes 
D)  Mitochondria, chloroplasts, and peroxisomes

Question 12

Where in mitochondria does each of the following processes or events occur?
-Synthesis of mitochondrial ribosomal RNAs

Accepted Answer

The mitoch

Question 13

Mitochondrial DNA is inherited by means of

Accepted Answer

A)  maternal transmission. 
B)  paternal transmission. 
C)  random assortment. 
D)  Mendelian genetics. 
A)  maternal transmission. 
B)  paternal transmission. 
C)  random assortment. 
D)  Mendelian genetics.

Question 14

Assuming that human mitochondria contain about 1,500 different proteins, approximately what percentage of the mitochondrial proteome is encoded by mitochondrial DNA?

Accepted Answer

A)  0.05% 
B)  0.1% 
C)  0.5% 
D)  1.0% 
A)  0.05% 
B)  0.1% 
C)  0.5% 
D)  1.0%

Question 15

What are porins?

Accepted Answer

Porins are transmembrane proteins that f

Question 16

Which of the following is not involved in protein transport into mitochondria?

Accepted Answer

A)  A positively charged presequence of 15-55 amino acids located at the N-terminus 
B)  The Tom complex 
C)  The proton gradient across the inner mitochondrial membrane 
D)  Vesicular transport 
A)  A positively charged presequence of 15-55 amino acids located at the N-terminus 
B)  The Tom complex 
C)  The proton gradient across the inner mitochondrial membrane 
D)  Vesicular transport

Question 17

Although chloroplasts encode more of their own proteins than mitochondria, about 3,000 or 95% of chloroplast proteins are still encoded by _______ genes.

Accepted Answer

The answer of Although chloroplasts encode more of their own...

Question 18

Human diseases caused by mutations in mitochondrial genomes

Accepted Answer

A)  are inherited from both parents. 
B)  are inherited from the father. 
C)  are inherited from the mother. 
D)  do not exist, because the mutation is always complemented by the normal gene copy in the nucleus. 
A)  are inherited from both parents. 
B)  are inherited from the father. 
C)  are inherited from the mother. 
D)  do not exist, because the mutation is always complemented by the normal gene copy in the nucleus.

Question 19

Most proteins are imported into mitochondria in their fully folded state.

Accepted Answer

A) True 
 B)False

Question 20

The mitochondrial protein presequence is cleaved off by a protease called

Accepted Answer

A)  signal peptidase. 
B)  presequence protease. 
C)  ubiquitin-targeted protease. 
D)  matrix processing peptidase. 
A)  signal peptidase. 
B)  presequence protease. 
C)  ubiquitin-targeted protease. 
D)  matrix processing peptidase.

In what way does the mitochondrial genetic code differ from the "universal" genetic code?

Which of the following phospholipids contains four fatty acid chains and is associated with a restriction in proton flow?

A deficiency in cardiolipin would lead to

The amino terminal presequence on proteins imported into the mitochondrial inner membrane is

What would be the effect of a mutation in the Tim23 complex?

Mitochondria lacking mitochondrial DNA are soon unable to make ATP by oxidative phosphorylation.

Where in mitochondria does each of the following processes or events occur? -The citric acid cycle

The chloroplast genome contains about _______ genes.

Which of the following is a mitochondrial disease?

Which of the following contain their own genomes?

Where in mitochondria does each of the following processes or events occur? -Synthesis of mitochondrial ribosomal RNAs

Mitochondrial DNA is inherited by means of

Assuming that human mitochondria contain about 1,500 different proteins, approximately what percentage of the mitochondrial proteome is encoded by mitochondrial DNA?

What are porins?

Which of the following is not involved in protein transport into mitochondria?

Although chloroplasts encode more of their own proteins than mitochondria, about 3,000 or 95% of chloroplast proteins are still encoded by _______ genes.

Human diseases caused by mutations in mitochondrial genomes

Most proteins are imported into mitochondria in their fully folded state.

The mitochondrial protein presequence is cleaved off by a protease called

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

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Exam 13: Mitochondria, Chloroplasts, and Peroxisomes

In what way does the mitochondrial genetic code differ from the "universal" genetic code?

Which of the following phospholipids contains four fatty acid chains and is associated with a restriction in proton flow?

A deficiency in cardiolipin would lead to

The amino terminal presequence on proteins imported into the mitochondrial inner membrane is

What would be the effect of a mutation in the Tim23 complex?

Mitochondria lacking mitochondrial DNA are soon unable to make ATP by oxidative phosphorylation.

Where in mitochondria does each of the following processes or events occur? -The citric acid cycle

The chloroplast genome contains about _______ genes.

Which of the following is a mitochondrial disease?

Which of the following contain their own genomes?

Where in mitochondria does each of the following processes or events occur? -Synthesis of mitochondrial ribosomal RNAs

Mitochondrial DNA is inherited by means of

Assuming that human mitochondria contain about 1,500 different proteins, approximately what percentage of the mitochondrial proteome is encoded by mitochondrial DNA?

What are porins?

Which of the following is not involved in protein transport into mitochondria?

Although chloroplasts encode more of their own proteins than mitochondria, about 3,000 or 95% of chloroplast proteins are still encoded by _______ genes.

Human diseases caused by mutations in mitochondrial genomes

Most proteins are imported into mitochondria in their fully folded state.

The mitochondrial protein presequence is cleaved off by a protease called

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters