Question 1

Dermal stem cells divide,with some cells continuing the stem cell line and others being pushed toward the surface to flatten and die and be sloughed off.In the bone marrow,other stem cells produce cells such as the red blood cells that lose their nucleus and function for a short time before they too die.These cells that reproduce no further

Accepted Answer

A)  leave the cell cycle in a G0 phase,which immediately follows telophase.
B)  leave the cell cycle in a G3 phase,which immediately follows G2.
C)  halt in the midst of the S phase.
D)  continually cycle but simply fail to go through cytokinesis.E) B) and C)
F) A) and D)

Question 2

Phospholipids in a plasma membrane are oriented such that the water-soluble or _________ ends face outside and the fat-soluble or hydrophobic ends face inward.

Accepted Answer

The answer of Phospholipids in a plasma membrane are oriented...

Question 3

Which of the following is a correct statement comparing prokaryotic and eukaryotic cells?

Accepted Answer

A)  Both must provide for transfer of genetic information
B)  Both must have some individuals that reproduce
C)  Both must separate their interior world from the external world
D)  All of the choices are correctE) A) and C)
F) A) and B)

Question 4

Movement is not only a feature of animal cells but of all eukaryotic cells.Which of the following are involved in a cell's ability to move?

Accepted Answer

A)  Microtubules
B)  Microfilaments
C)  Actin and myosin
D)  All of the choices are correctE) A) and B)
F) A) and C)

Question 5

The best definition of diffusion is

Accepted Answer

A)  movement of molecules from higher concentration to lower concentration.
B)  movement of water across a semi-permeable membrane from high water concentration to lower water concentration.
C)  movement of molecules from lower concentration to higher concentration.
D)  movement of a substance against its concentration through the release of energy from ATP.E) A) and C)
F) None of the above

Question 6

Pinocytosis involves invaginated units called ________ that contain concentrations of specific binding receptors on their surface.

Accepted Answer

The answer of Pinocytosis involves invaginated units called ________ that...

Question 7

Which element is NOT correctly associated below?

Accepted Answer

A)  Cilia have 9 pair of microtubules surrounding a central pair
B)  Microtubules are made up of a protein called tubulin
C)  Pseudopodia stream without the involvement of any microfilaments
D)  Centrioles have a microtubule structureE) A) and B)
F) A) and C)

Question 8

Which is the best definition of active transport?

Accepted Answer

A)  Movement of molecules from higher concentration to lower concentration
B)  Movement of water across a semi-permeable membrane from high water concentration to lower water concentration
C)  Movement of molecules from lower concentration to higher concentration
D)  Movement of a substance against its concentration with the energy released from ATPE) B) and C)
F) None of the above

Question 9

If a fish is placed in an isotonic solution,which will occur?

Accepted Answer

A)  Salts will move into the fish from the surrounding solution
B)  Water will move into the fish from the surrounding solution
C)  Salts will move out of the fish into the surrounding solution
D)  Water will move out of the fish into the surrounding solution
E)  None of the choices will occurF) B) and D)
G) A) and E) E

Question 10

Biologists label various carbohydrates,fats and amino acids with radio-isotopes,place them in a cell culture,and allow time for cell metabolism.Then by disrupting cells in a blender and separating out various cell organelles,they find the radioactive molecules can be detected as part of various cellular compounds although visible cell structures appear unchanged.Therefore

Accepted Answer

A)  these "food" molecules are used only for energy.
B)  most cell components are constantly being broken down and rebuilt.
C)  molecules diffuse at random through the cytoplasm and into cell organelles.
D)  radioactivity has an unusual role in metabolism of living cells.E) B) and C)
F) C) and D)

Question 11

Which does NOT occur in telophase?

Accepted Answer

A)  Cytokinesis is underway
B)  Nuclear envelope is reconstructed
C)  Centromeres split apart
D)  Chromosomes decondense into chromatinE) B) and C)
F) None of the above

Question 12

Cyclin-dependent kinases and cyclins are most closely associated with

Accepted Answer

A)  maintaining interphase.
B)  regulating the cell cycle.
C)  cytokinesis.
D)  programmed cell death.E) A) and B)
F) A) and C) B

Question 13

Major functions of the plasma membrane do NOT include

Accepted Answer

A)  regulating molecules and ions that pass into and out of the cell.
B)  recognizing and communicating between different cells and tissues.
C)  maintaining connections between adjacent cells.
D)  producing proteins used in construction of the cell.E) A) and D)
F) None of the above

Question 14

The Dutch microscopist who sent letters to the Royal Society of London describing his many detailed observations of life,including units later known to be cells,was

Accepted Answer

A)  Anton van Leeuwenhoek.
B)  Robert Hooke.
C)  Matthias Schleiden.
D)  J.Purkinje.E) A) and B)
F) A) and C)

Question 15

Technically,osmosis is

Accepted Answer

A)  movement of molecules from higher concentration to lower concentration.
B)  movement of water across a semi-permeable membrane from high water concentration to lower water concentration.
C)  movement of molecules from lower concentration to higher concentration.
D)  movement of water across a semi-permeable membrane from low water concentration to higher water concentration.
E)  movement of a substance against its concentration through the release of energy from ATP.F) A) and B)
G) A) and C)

Question 16

Describe the structure and function of a ribosome,and describe how they differ between prokaryotes and eukaryotes.

Accepted Answer

Ribosomes are cellular structures responsible for protein synthesis. They are composed of two subunits, a large subunit and a small subunit, which come together to form a functional ribosome. The small subunit is responsible for reading the mRNA (messenger RNA) and the large subunit is responsible for catalyzing the formation of peptide bonds between amino acids to create a protein.

In prokaryotic cells, ribosomes are smaller in size (70S) and are composed of a 30S small subunit and a 50S large subunit. In eukaryotic cells, ribosomes are larger (80S) and are composed of a 40S small subunit and a 60S large subunit. This difference in size and composition allows for the development of antibiotics that specifically target bacterial ribosomes without affecting eukaryotic ribosomes.

Overall, the structure and function of ribosomes are essential for protein synthesis in all cells, but there are differences in size and composition between prokaryotic and eukaryotic ribosomes.

Question 17

Which represents the correct sequence of stages in the cell cycle?

Accepted Answer

A)  S,G1,G2
B)  G2,S,G1
C)  G1,S,G2
D)  G1,G2,SE) A) and B)
F) B) and C)

Question 18

In most animal cells,the majority of the cell cycle is spent in

Accepted Answer

A)  metaphase.
B)  anaphase.
C)  interphase.
D)  prophase.E) B) and D)
F) A) and B)

Question 19

Which is true concerning the Golgi complex?

Accepted Answer

A)  It consists of a stack of membranous vesicles
B)  Golgi complexes in animal cells have a forming face and a maturing face
C)  Lysosomes are enzyme-filled vesicles that bud from the Golgi complex
D)  All of the choices are correctE) B) and C)
F) A) and D)

Question 20

A high-powered microscope that produces a surface image from scattered secondary electrons is the

Accepted Answer

A)  brightfield light microscope.
B)  transmission electron microscope (TEM) .
C)  scanning electron microscope (SEM) .
D)  confocal microscope.E) A) and B)
F) A) and C)

Exam 3: Cells As Units of Life

Correct Answer
verified

Phospholipids in a plasma membrane are oriented such that the water-soluble or _________ ends face outside and the fat-soluble or hydrophobic ends face inward.

Correct Answer
verified

Which of the following is a correct statement comparing prokaryotic and eukaryotic cells?

Correct Answer
verified

Movement is not only a feature of animal cells but of all eukaryotic cells.Which of the following are involved in a cell's ability to move?

Correct Answer
verified

The best definition of diffusion is

Correct Answer
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Pinocytosis involves invaginated units called ________ that contain concentrations of specific binding receptors on their surface.

Correct Answer
verified

Which element is NOT correctly associated below?

Correct Answer
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Which is the best definition of active transport?

Correct Answer
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If a fish is placed in an isotonic solution,which will occur?

Correct Answer
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E

Correct Answer
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Which does NOT occur in telophase?

Correct Answer
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Cyclin-dependent kinases and cyclins are most closely associated with

Correct Answer
verified
B

Major functions of the plasma membrane do NOT include

Correct Answer
verified

The Dutch microscopist who sent letters to the Royal Society of London describing his many detailed observations of life,including units later known to be cells,was

Correct Answer
verified

Technically,osmosis is

Correct Answer
verified

Describe the structure and function of a ribosome,and describe how they differ between prokaryotes and eukaryotes.

Which represents the correct sequence of stages in the cell cycle?

Correct Answer
verified

In most animal cells,the majority of the cell cycle is spent in

Correct Answer
verified

Which is true concerning the Golgi complex?

Correct Answer
verified

A high-powered microscope that produces a surface image from scattered secondary electrons is the

Correct Answer
verified

Exam 3: Cells As Units of Life

Correct AnswerverifiedShow Answer

Phospholipids in a plasma membrane are oriented such that the water-soluble or _________ ends face outside and the fat-soluble or hydrophobic ends face inward.

Correct AnswerverifiedShow Answer

Which of the following is a correct statement comparing prokaryotic and eukaryotic cells?

Correct AnswerverifiedShow Answer

Movement is not only a feature of animal cells but of all eukaryotic cells.Which of the following are involved in a cell's ability to move?

Correct AnswerverifiedShow Answer

The best definition of diffusion is

Correct AnswerverifiedShow Answer

Pinocytosis involves invaginated units called ________ that contain concentrations of specific binding receptors on their surface.

Correct AnswerverifiedShow Answer

Which element is NOT correctly associated below?

Correct AnswerverifiedShow Answer

Which is the best definition of active transport?

Correct AnswerverifiedShow Answer

If a fish is placed in an isotonic solution,which will occur?

Correct AnswerverifiedE

Correct AnswerverifiedShow Answer

Which does NOT occur in telophase?

Correct AnswerverifiedShow Answer

Cyclin-dependent kinases and cyclins are most closely associated with

Correct AnswerverifiedB

Major functions of the plasma membrane do NOT include

Correct AnswerverifiedShow Answer

The Dutch microscopist who sent letters to the Royal Society of London describing his many detailed observations of life,including units later known to be cells,was

Correct AnswerverifiedShow Answer

Technically,osmosis is

Correct AnswerverifiedShow Answer

Describe the structure and function of a ribosome,and describe how they differ between prokaryotes and eukaryotes.

Which represents the correct sequence of stages in the cell cycle?

Correct AnswerverifiedShow Answer

In most animal cells,the majority of the cell cycle is spent in

Correct AnswerverifiedShow Answer

Which is true concerning the Golgi complex?

Correct AnswerverifiedShow Answer

A high-powered microscope that produces a surface image from scattered secondary electrons is the

Correct AnswerverifiedShow Answer

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E

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B

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