Cell Biology

Multiple protein complexes associated with the cellular respiration are known as

Multiple protein complexes associated with the cellular respiration are known as

Multiple protein complexes associated with the cellular respiration are known as
A) Q cycles.
B) chemiosmotic coupling complexes.
C) Fe-S centers.
D) respirasomes.
E) synthesomes.

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virion

The overall efficiency of aerobic respiration in eukaryotes is about

The overall efficiency of aerobic respiration in eukaryotes is about

The overall efficiency of aerobic respiration in eukaryotes is about 
A) 10%.
B) 25%.
C) 55%.
D) 75%.
E) 100%.

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virion

The chemiosmotic model of ATP synthesis is based on several lines of experimental evidence. Which of

The chemiosmotic model of ATP synthesis is based on several lines of experimental evidence. Which of

The chemiosmotic model of ATP synthesis is based on several lines of experimental evidence. Which of the following statements is not correct experimental evidence to support the chemiosmotic model?
A) Artificial proton gradients established by a

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Of the carrier molecules in the electron transport chain, which has heme as part of its prosthetic g

Of the carrier molecules in the electron transport chain, which has heme as part of its prosthetic g

Of the carrier molecules in the electron transport chain, which has heme as part of its prosthetic group?
A) flavoproteins 
B) iron-sulfur proteins 
C) cytochromes 
D) copper-containing cytochromes 
E)

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Of the following sequences, which shows the correct molecules through which electrons flow when deli

Of the following sequences, which shows the correct molecules through which electrons flow when deli

Of the following sequences, which shows the correct molecules through which electrons flow when delivered to the electron transport system by NADH?
A) complex I, cytochrome c, complex III, coenzyme Q, complex IV, oxygen 
B) complex I,

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Which of the numbered respiratory complexes is not correctly paired with its name?

Which of the numbered respiratory complexes is not correctly paired with its name?

Which of the numbered respiratory complexes is not correctly paired with its name?                                               

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virion

Which of the following molecules is not a carrier of electrons in the electron transport system (ETS

Which of the following molecules is not a carrier of electrons in the electron transport system (ETS

Which of the following molecules is not a carrier of electrons in the electron transport system (ETS)? 
A) flavoproteins 
B) copper-nickel compounds 
C) cytochromes 
D) iron-sulfur proteins 
E) c

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virion

In electron transport, which respiratory complex is not involved in the flow of electrons from FADH2

In electron transport, which respiratory complex is not involved in the flow of electrons from FADH2

In electron transport, which respiratory complex is not involved in the flow of electrons from FADH2?
A) complex I
B) complex II
C) complex III
D) complex IV
E) all of the above

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virion

In electron transport, which respiratory complex is not involved in the flow of electrons from NADH?

In electron transport, which respiratory complex is not involved in the flow of electrons from NADH?

In electron transport, which respiratory complex is not involved in the flow of electrons from NADH? 
A) complex I 
B) complex II 
C) complex III 
D) complex IV 
E) all of the above

Astatine   307   3 Replies

virion

The TCA cycle and glyoxylate cycle are similar in many respects. Which of the following statements a

The TCA cycle and glyoxylate cycle are similar in many respects. Which of the following statements a

The TCA cycle and glyoxylate cycle are similar in many respects. Which of the following statements accurately describes these cycles? 
A) Both cycles are catabolic in function.   
B) The glyoxylate cycle has only a single decarbo

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Of the following enzymes associated with the TCA cycle, which of the following enzymes is not under

Of the following enzymes associated with the TCA cycle, which of the following enzymes is not under

Of the following enzymes associated with the TCA cycle, which of the following enzymes is not under allosteric regulation? 
A) isocitrate dehydrogenase
B) α-ketoglutarate dehydrogenase
C) malate dehydrogenase
D) fumarate

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virion

When utilizing fats as an energy source, the glycerol portion enters the ________ when it has been c

When utilizing fats as an energy source, the glycerol portion enters the ________ when it has been c

When utilizing fats as an energy source, the glycerol portion enters the ________ when it has been converted to ________. 
A) TCA cycle; pyruvate
B) glycolysis; fructose-6-phosphate
C) TCA cycle; acetyl CoA
D) electron tr

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Each of the following is a step in the degradation of fatty acids except

Each of the following is a step in the degradation of fatty acids except

Each of the following is a step in the degradation of fatty acids except
A) hydration
B) reoxidation
C) thiolysis
D) acylation
E) oxidation

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The sequential process of fatty acid catabolism to acetyl CoA is called

The sequential process of fatty acid catabolism to acetyl CoA is called

The sequential process of fatty acid catabolism to acetyl CoA is called 
A) hydrogenation.
B) oxidative phosphorylation.
C) β-oxidation.
D) the glyoxylate cycle.
E) the Cori cycle.

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If a eukaryotic organism does not depend on fatty acids as an energy source, one would expect to fin

If a eukaryotic organism does not depend on fatty acids as an energy source, one would expect to fin

If a eukaryotic organism does not depend on fatty acids as an energy source, one would expect to find β-oxidation activity associated with which of the following organelles?
A) cytoplasm
B) mitochondrion
C) peroxisome
D) ribosome

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β-oxidation (Multiple Choice)

β-oxidation (Multiple Choice)

β-oxidation 
A) is the second step in the oxidation of glucose.
B) is a process used to oxidize fatty acids. 
C) occurs in the cytoplasm.
D) is a process used to digest some polysaccharides.
E) both choices B a

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Which molecule is incorrectly matched with the number of carbon atoms it possesses?

Which molecule is incorrectly matched with the number of carbon atoms it possesses?

Which molecule is incorrectly matched with the number of carbon atoms it possesses? 
A) citrate-6
B) α-ketoglutarate-5
C) acetyl CoA-2
D) malate-5
E) isocitrate-6

Astatine   214   3 Replies

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NADH concentrations serve to regulate oxidative decarboxylation and the TCA cycle. Which of the foll

NADH concentrations serve to regulate oxidative decarboxylation and the TCA cycle. Which of the foll

NADH concentrations serve to regulate oxidative decarboxylation and the TCA cycle. Which of the following enzymes is not regulated by NADH? 
A) pyruvate dehydrogenase
B) isocitrate dehydrogenase
C) α-ketoglutarate dehydrogenase

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During which of the following steps of the TCA cycle does substrate-level phosphorylation take place

During which of the following steps of the TCA cycle does substrate-level phosphorylation take place

During which of the following steps of the TCA cycle does substrate-level phosphorylation take place? 
A) TCA-2 
B) TCA-3 
C) TCA-4 
D) TCA-5 
E) TCA-6

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Which of the following processes is associated with the outer mitochondrial membrane?

Which of the following processes is associated with the outer mitochondrial membrane?

Which of the following processes is associated with the outer mitochondrial membrane? 
A) phospholipid synthesis 
B) metabolite transport 
C) β-oxidation of fats 
D) transcription 
E) ATP synthes

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Which of the following structures serves the same purpose as the inner membrane and matrix of the mi

Which of the following structures serves the same purpose as the inner membrane and matrix of the mi

Which of the following structures serves the same purpose as the inner membrane and matrix of the mitochondrion with regard to their roles in aerobic respiration?
A) ribosomes
B) cell membrane
C) cytoplasm
D) nuceloid
E) both

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Which of the following is not one of the major transport systems of the inner mitochondrial membrane

Which of the following is not one of the major transport systems of the inner mitochondrial membrane

Which of the following is not one of the major transport systems of the inner mitochondrial membrane? 
A) sodium-potassium pump 
B) dicarboxylate carriers 
C) tricarboxylate carriers 
D) pyruvate carrier co

Astatine   361   3 Replies

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A key regulator of both glycolysis and gluconeogenesis is

A key regulator of both glycolysis and gluconeogenesis is

A key regulator of both glycolysis and gluconeogenesis is
A) hexokinase.
B) glyceraldehyde-3-phosphate.
C) alanine.
D) coenzyme (CoA).
E) fructose-2, 6-biophosphate.

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Which of the following is closest to a micrometer in size?

Which of the following is closest to a micrometer in size?

Which of the following is closest to a micrometer in size?
A) the width of a strand of DNA
B) the length of a plant cell
C) the length of a chicken egg
D) a typical bacterial cell
E) the size of a ribosome

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Lilligant

In 1665, ________ used a microscope that he had built to examine thin slices of ________. While exam

In 1665, ________ used a microscope that he had built to examine thin slices of ________. While exam

In 1665, ________ used a microscope that he had built to examine thin slices of ________. While examining this material, he observed tiny compartments that he called cellulae.
A) Theodor Schwann; animal tissue
B) Robert Hooke; cork
C)

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Lilligant

Which organelle is round and derives its name from the Latin word for "kernel"?

Which organelle is round and derives its name from the Latin word for "kernel"?

Which organelle is round and derives its name from the Latin word for "kernel"?
A) Golgi complex
B) mitochondrion
C) chloroplast
D) nucleus
E) lysosome

Astatine   312   3 Replies

Lilligant

Which of the following is true of a nanometer?

Which of the following is true of a nanometer?

Which of the following is true of a nanometer?
A) A nanometer is about the size of a common bacterial cell.
B) A nanometer is one millionth of a meter.
C) A nanometer is equivalent to 10 Angstroms (Å).
D) The nanometer is the most

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Lilligant

Which of the following is not a tenet of the cell theory?

Which of the following is not a tenet of the cell theory?

Which of the following is not a tenet of the cell theory?
A) All organisms consist of one or more cells.
B) All cells arise from preexisting cells.
C) The cell is the basic unit of structure for all organisms.
D) All cells have a

Astatine   254   3 Replies

Lilligant

Which of the following is smallest?

Which of the following is smallest?

Which of the following is smallest?
A) ribosome
B) virus
C) protein
D) mitochondrion
E) bacterium

Astatine   242   3 Replies

Lilligant

Pyruvate is converted to acetyl CoA by a unique enzyme known as

Pyruvate is converted to acetyl CoA by a unique enzyme known as

Pyruvate is converted to acetyl CoA by a unique enzyme known as
A) pyruvate decarboxylase.
B) pyruvate dehydrogenase complex.
C) transitionase system.
D) multiplex enzyme system.
E) pyruvate CoA transferase.

Astatine   473   3 Replies

Lilligant

In eukaryotes, pyruvate is converted to acetyl CoA

In eukaryotes, pyruvate is converted to acetyl CoA

In eukaryotes, pyruvate is converted to acetyl CoA   
A) in the cellular cytosol.
B) when passing through the mitochondrial outer membrane.
C) in the intermembrane space.
D) when passing the mitochondrial cristae.
E)

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Lilligant

As pyruvate is prepared for the TCA cycle, it undergoes a process of

As pyruvate is prepared for the TCA cycle, it undergoes a process of

As pyruvate is prepared for the TCA cycle, it undergoes a process of 
A) reductive carboxylation. 
B) oxidative decarboxylation. 
C) oxidative carboxylation. 
D) reductive decarboxylation. 
E) Co

Astatine   181   3 Replies

Lilligant

Which of the following would not be used as a final electron acceptor in anaerobic respiration?

Which of the following would not be used as a final electron acceptor in anaerobic respiration?

Which of the following would not be used as a final electron acceptor in anaerobic respiration? 
A) oxygen 
B) sulfur 
C) protons 
D) iron 
E) nitrogen

Astatine   298   3 Replies

Lilligant

The endosymbiotic theory states that mitochondria originated from

The endosymbiotic theory states that mitochondria originated from

The endosymbiotic theory states that mitochondria originated from 
A) a routine step in evolution. 
B) the fusion of several prokaryotes. 
C) purple bacteria entering and remaining in the cytoplasm of another cell.&nb

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Lilligant

Carbon dioxide generally enters the plant through pores called

Carbon dioxide generally enters the plant through pores called

Carbon dioxide generally enters the plant through pores called   
A) mesophyll. 
B) stomata. 
C) the cuticle. 
D) connexons. 
E) bacteriochlorophylls.

Astatine   936   4 Replies

Lilligant

The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by whi

The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by whi

The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements? 
A) PSI absorbs only short wavelengths of light. 
B) Electrons are excited by PSI or PSII, but n

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Lilligant

In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-

In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-

In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate is 
A) phosphoglycerokinase. 
B) ribulose bisphosphate carboxylase/oxygenase (rubisco). 
C) triose p

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Lilligant

Which of the following is not an essential feature of electron transfer from water to NADP+?

Which of the following is not an essential feature of electron transfer from water to NADP+?

Which of the following is not an essential feature of electron transfer from water to NADP+? 
A) photosystem II complex 
B) photosystem I complex 
C) coenzyme Q 
D) plastocyanin (PC) 
E) cytochro

Astatine   544   3 Replies

Lilligant

Which of the following statements accurately describes the Calvin cycle?

Which of the following statements accurately describes the Calvin cycle?

Which of the following statements accurately describes the Calvin cycle? 
A) It is a carbon assimilation process. 
B) In this process, carbon dioxide is reduced to organic sugars. 
C) It occurs in the chloroplast stro

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Lilligant

Biosynthesis of sucrose occurs in the

Biosynthesis of sucrose occurs in the

Biosynthesis of sucrose occurs in the 
A) cytoplasm. 
B) stroma. 
C) thylakoid lumen. 
D) intermembrane space. 
E) stroma thylakoids.

Astatine   285   3 Replies

Lilligant