Question 1

A cell membrane is not

Accepted Answer

A)   a rigid structure.
B)   a bilayered structure.
C)   composed of phospholipid molecules.
D)   a fluid structure.
E)   a mosaic structure.F) C) and D)
G) A) and B)

Question 2

Liver cells help clean your blood with a wide range of digestive enzymes that hydrolyze toxic molecules.The liver cells would have ____,which are organelles specialized to do this.

Accepted Answer

A)   golgi apparatus
B)   vesicle
C)   peroxisomes
D)   lysosomesE) A) and B)
F) C) and D)

Question 3

What is the role of tubulin during mitosis in eukaryotic cells?

Accepted Answer

A)   It is necessary for the cell to grow.
B)   It pulls a cell's chromosomes apart during cell division.
C)   It is necessary for the DNA to replicate.
D)   It maintains cell shape with an internal scaffold structure.
E)   It is used to bind some adjacent cells together in animal cell junctions.F) All of the above
G) C) and D)

Question 4

You discover a new life-form,and study it under an electron microscope.You find that its cells have no organelles,a peptidoglycan cell wall,and fatty acids in its plasma membrane.You conclude that the new life-form is in which domain?

Accepted Answer

A)   Bacteria
B)   Archaea
C)   Eukarya
D)   Protista
E)   AnimaliaF) A) and D)
G) A) and E)

Question 5

Members of Archaea are often referred to as extremophiles because many live in conditions of extreme

Accepted Answer

A)   acidity.
B)   All of the answer choices are correct.
C)   temperature.
D)   salinity.
E)   heat.F) None of the above
G) B) and E)

Question 6

A cytoskeleton is

Accepted Answer

A)   a system of tracks used for intracellular transport.
B)   composed of microtubules, microfilaments, and intermediate filaments.
C)   a structure that aids in the process of cell division.
D)   All of the answer choices are correct.
E)   found in the cytoplasm of eukaryotic cells.F) B) and D)
G) A) and E)

Question 7

How do vesicles carrying proteins destined for secretion move to the plasma membrane?

Accepted Answer

A)   along actin
B)   They swim with flagella.
C)   along microtubules
D)   by diffusion
E)   They swim with cilia.F) B) and D)
G) C) and E)

Question 8

In most mammals the DNA found in mitochondria is inherited from

Accepted Answer

A)   the mother and father.
B)   the father only.
C)   neither parent.
D)   the mother only.E) C) and D)
F) All of the above

Question 9

Plant growth and flowering are strongly controlled by root and stem signal chemicals.Which of the following cell connection transports these molecules between adjacent cells?

Accepted Answer

A)   gap junction
B)   cell wall
C)   plasmodesmata
D)   anchoring junction
E)   tight junctionF) A) and B)
G) A) and C)

Question 10

The theory of endosymbiosis is based on

Accepted Answer

A)   the observations that chloroplasts and mitochondria resemble bacteria.
B)   the experiments in which bacteria were made to grow in plant cells forming chloroplasts.
C)   similarities between chloroplasts and other organelles in animals.
D)   evidence from the fossil record.
E)   the knowledge that ribosomes are structures found in bacteria, plants, and animals.F) D) and E)
G) B) and E)

Question 11

With electron microscopes,researchers have found a group of bacteria to have folded membranes resembling thylakoids.The membranes contain molecules similar to those in plant chloroplasts,allowing photosynthesis to take place.A likely explanation for the similarity of the membrane in bacterial cells is that

Accepted Answer

A)   these bacteria share similar genetic controls, regulating the formation of the folded membranes, with plants.
B)   these bacteria share structure and molecules, but could not be expected to do photosynthesis without specialized compartments.
C)   these bacteria should be reclassified as eukaryotes, since they share the thylakoid membrane and molecules with plants and protists.
D)   these bacteria fully evolved to have membrane-bound organelles, like the eukaryotes.E) A) and D)
F) A) and B)

Question 12

In a human,the intestines need to form a barrier to prevent bacteria and other microbes from moving into the bloodstream from the gut.Which of the following would prevent bacteria from moving between intestinal cells?

Accepted Answer

A)   plasmodesmata
B)   cell wall
C)   anchoring junction
D)   gap junction
E)   tight junctionF) A) and B)
G) A) and E)

Question 13

A central vacuole of a mature plant cell

Accepted Answer

A)   stores genetic information.
B)   produces energy from nutrients.
C)   produces protein.
D)   produces turgor pressure.
E)   produces mRNA.F) A) and B)
G) None of the above

Question 14

The scientist(s) given credit for adding the third tenet (all cells come from preexisting cells) to the cell theory is (are)

Accepted Answer

A)   Mathias Schleiden and Theodore Schwann.
B)   Rudolf Virchow.
C)   Louis Pasteur.
D)   Robert Hooke.
E)   Antony van Leeuwenhoek.F) A) and B)
G) A) and C)

Question 15

The reason that mitochondrial DNA in most mammals is inherited from the mother only is because a sperm cell contains no mitochondria.

Accepted Answer

A) True 
 B)False

Question 16

The scientist(s) given credit for first using the term "cell" to describe the basic unit of life is (are)

Accepted Answer

A)   Louis Pasteur.
B)   Robert Hooke.
C)   Mathias Schleiden and Theodore Schwann.
D)   Antony van Leeuwenhoek.
E)   Rudolf Virchow.F) B) and C)
G) A) and D)

Question 17

In muscle contraction,____ and myosin filaments slide across each other.

Accepted Answer

A)   flagella
B)   actin
C)   tubulin
D)   cilia
E)   intermediate filamentsF) C) and E)
G) C) and D)

Question 18

Herceptin medication used for treating breast cancers,and Gleevec medication used for leukemia demonstrate that

Accepted Answer

A)   'chemotherapy' of breast cancer and others is directed towards quickly killing all cells in the affected tissue.
B)   the cell membrane is the common cell component that fails in all cancers.
C)   specific molecules contribute to the structure and function of cells.
D)   medical research has now given us strong prevention of these two cancers.E) C) and D)
F) None of the above

Question 19

Determine which of these cells has the largest problems due to surface area limitations.

Accepted Answer

A)   A normal
B)   An amoeba cell in a lake may be 0.50 millimeters, variable in shape with many long, narrow extensions of the cell.
C)   A human egg cell is often 0.13 millimeters, and is spherical in shape.
D)   An epithelial cell lining any mammal arteries may be 0.03 millimeters, and has a very flat shape.
E)   coli fecal cell in the digestive tract of animals may be 0.003 millimeters, in a rounded rod or cylinder shape.F) B) and C)
G) C) and D)

Question 20

Of the three domains of organisms,only the Bacteria are prokaryotes.

Accepted Answer

A) True 
 B)False

Exam 3: Cell Structure and Function

What is the role of tubulin during mitosis in eukaryotic cells?

Correct Answer
verified

The reason that mitochondrial DNA in most mammals is inherited from the mother only is because a sperm cell contains no mitochondria.

Correct Answer
verified

The theory of endosymbiosis is based on

Correct Answer
verified

Members of Archaea are often referred to as extremophiles because many live in conditions of extreme

Correct Answer
verified

In a human,the intestines need to form a barrier to prevent bacteria and other microbes from moving into the bloodstream from the gut.Which of the following would prevent bacteria from moving between intestinal cells?

Correct Answer
verified

The scientist(s) given credit for first using the term "cell" to describe the basic unit of life is (are)

Correct Answer
verified

A cell membrane is not

Correct Answer
verified

In muscle contraction,____ and myosin filaments slide across each other.

Correct Answer
verified

In most mammals the DNA found in mitochondria is inherited from

Correct Answer
verified

Herceptin medication used for treating breast cancers,and Gleevec medication used for leukemia demonstrate that

Correct Answer
verified

How do vesicles carrying proteins destined for secretion move to the plasma membrane?

Correct Answer
verified

Plant growth and flowering are strongly controlled by root and stem signal chemicals.Which of the following cell connection transports these molecules between adjacent cells?

Correct Answer
verified

Determine which of these cells has the largest problems due to surface area limitations.

Correct Answer
verified

A cytoskeleton is

Correct Answer
verified

A central vacuole of a mature plant cell

Correct Answer
verified

Liver cells help clean your blood with a wide range of digestive enzymes that hydrolyze toxic molecules.The liver cells would have ____,which are organelles specialized to do this.

Correct Answer
verified

You discover a new life-form,and study it under an electron microscope.You find that its cells have no organelles,a peptidoglycan cell wall,and fatty acids in its plasma membrane.You conclude that the new life-form is in which domain?

Correct Answer
verified

The scientist(s) given credit for adding the third tenet (all cells come from preexisting cells) to the cell theory is (are)

Correct Answer
verified

Correct Answer
verified

Of the three domains of organisms,only the Bacteria are prokaryotes.

Correct Answer
verified

Exam 3: Cell Structure and Function

What is the role of tubulin during mitosis in eukaryotic cells?

Correct AnswerverifiedShow Answer

The reason that mitochondrial DNA in most mammals is inherited from the mother only is because a sperm cell contains no mitochondria.

Correct AnswerverifiedShow Answer

The theory of endosymbiosis is based on

Correct AnswerverifiedShow Answer

Members of Archaea are often referred to as extremophiles because many live in conditions of extreme

Correct AnswerverifiedShow Answer

In a human,the intestines need to form a barrier to prevent bacteria and other microbes from moving into the bloodstream from the gut.Which of the following would prevent bacteria from moving between intestinal cells?

Correct AnswerverifiedShow Answer

The scientist(s) given credit for first using the term "cell" to describe the basic unit of life is (are)

Correct AnswerverifiedShow Answer

A cell membrane is not

Correct AnswerverifiedShow Answer

In muscle contraction,____ and myosin filaments slide across each other.

Correct AnswerverifiedShow Answer

In most mammals the DNA found in mitochondria is inherited from

Correct AnswerverifiedShow Answer

Herceptin medication used for treating breast cancers,and Gleevec medication used for leukemia demonstrate that

Correct AnswerverifiedShow Answer

How do vesicles carrying proteins destined for secretion move to the plasma membrane?

Correct AnswerverifiedShow Answer

Plant growth and flowering are strongly controlled by root and stem signal chemicals.Which of the following cell connection transports these molecules between adjacent cells?

Correct AnswerverifiedShow Answer

Determine which of these cells has the largest problems due to surface area limitations.

Correct AnswerverifiedShow Answer

A cytoskeleton is

Correct AnswerverifiedShow Answer

A central vacuole of a mature plant cell

Correct AnswerverifiedShow Answer

Liver cells help clean your blood with a wide range of digestive enzymes that hydrolyze toxic molecules.The liver cells would have ____,which are organelles specialized to do this.

Correct AnswerverifiedShow Answer

You discover a new life-form,and study it under an electron microscope.You find that its cells have no organelles,a peptidoglycan cell wall,and fatty acids in its plasma membrane.You conclude that the new life-form is in which domain?

Correct AnswerverifiedShow Answer

The scientist(s) given credit for adding the third tenet (all cells come from preexisting cells) to the cell theory is (are)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Of the three domains of organisms,only the Bacteria are prokaryotes.

Correct AnswerverifiedShow Answer

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