Question 1

-What structure does "A" represent on the diagram of the plasma membrane?

Accepted Answer

A)   phospholipid bilayer
B)   internal membrane surface
C)   integral protein
D)   peripheral protein
E)   membrane channel proteinF) B) and D)
G) All of the above

Question 2

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "D"?

Accepted Answer

A)   major site of ATP synthesis when oxygen is available
B)   contains digestive enzymes
C)   outer boundary of cell, controls entry and exit of substances
D)   directs cellular activities, contains DNA
E)   site of protein synthesisF) A) and D)
G) A) and C)

Question 3

The movement of water through a selectively permeable membrane is called

Accepted Answer

A)   facilitated diffusion.
B)   active transport.
C)   diffusion.
D)   osmosis.
E)   endocytosis.F) C) and D)
G) A) and D)

Question 4

Ion movement across the plasma membrane creates an electrical charge difference known as ______.

Accepted Answer

A)   extracellular glycocalyx
B)   transcription
C)   respiration
D)   membrane potentialE) B) and C)
F) A) and D)

Question 5

Translation

Accepted Answer

A)   takes place in the nucleus.
B)   requires three types of DNA.
C)   requires the pairing of codons on mRNA with anticodons on tRNA.
D)   involves synthesis of RNA from DNA molecules.
E)   requires replication of DNA.F) A) and B)
G) A) and C)

Question 6

Which of the following are consistent with facilitated diffusion? (1)  movement is against a concentration gradient
(2)  movement is with a concentration gradient
(3)  involves a carrier molecule
(4)  involves cotransport
(5)  involves counter transport
(6)  exhibits competition and saturation

Accepted Answer

A)   1, 2, 4, 5, 6
B)   2, 3, 5, 6
C)   2, 3, 4, 6
D)   1, 3, 4, 5, 6
E)   2, 3, 6F) A) and C)
G) A) and B)

Question 7

The plasma membrane is selectively permeable. This means

Accepted Answer

A)   substances need permission to pass through it.
B)   ATP is always needed to move molecules across the plasma membrane.
C)   substances need carrier molecules to pass through it.
D)   only gases and water can pass through it.
E)   only certain substances can pass through it.F) None of the above
G) A) and B)

Question 8

Transcription

Accepted Answer

A)   occurs at the ribosomes.
B)   synthesizes RNA from DNA.
C)   synthesizes DNA from RNA.
D)   copies information from mRNA to tRNA.
E)   requires three types of RNA.F) A) and C)
G) All of the above

Question 9

Ribosomes are organelles responsible for

Accepted Answer

A)   packaging "cell products" for export.
B)   energy production.
C)   cell movement and cell shape.
D)   protein synthesis.
E)   manufacturing lipids.F) A) and E)
G) None of the above

Question 10

The "control center" of the cell is the

Accepted Answer

A)   endoplasmic reticulum.
B)   mitochondrion.
C)   nucleus.
D)   plasma membrane.
E)   ribosome.F) None of the above
G) B) and D)

Question 11

Cells that respond to ligands

Accepted Answer

A)   are using electrical signals in cellular communication.
B)   generally produce the ligands.
C)   possess receptor sites for specific ligands.
D)   are not functional.
E)   have lysosomes that destroy the ligands.F) C) and D)
G) A) and C)

Question 12

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "A"?

Accepted Answer

A)  site of protein synthesis
B)   major site of ATP synthesis when oxygen is available
C)   outer boundary of cell, controls entry and exit of substances
D)   contains digestive enzymes
E)   directs cellular activities, contains DNAF) B) and C)
G) C) and D)

Question 13

Which of the following is NOT true of a gene?

Accepted Answer

A)   It is all the triplets needed to make a functional RNA or protein.
B)   It is a segment of a DNA molecule.
C)   Each chromosome contains one gene.
D)   It is the functional unit of heredity.
E)   All of these are true of a gene.F) None of the above
G) A) and D)

Question 14

The centrioles are found in a zone of cytoplasm close to the nucleus called the

Accepted Answer

A)   vacuole.
B)   cytogel.
C)   centrosome.
D)   cytosol.
E)   proteasome.F) C) and D)
G) A) and B)

Question 15

What molecule(s)  cause(s)  a portion of a DNA molecule to unwind for transcription?

Accepted Answer

A)   poly-A tail
B)   transcription factors
C)   spliceosomes
D)   RNA ploymerase
E)   7-methylguanosine capF) None of the above
G) A) and C)

Question 16

In ______________, carrier molecules move a substance against (up)  the concentration gradient.

Accepted Answer

A)   facilitated diffusion
B)   simple diffusion
C)   endocytosis
D)   active transport
E)   exocytosisF) A) and D)
G) A) and E)

Question 17

What type of attachment proteins attach cells to extracellular molecules?

Accepted Answer

A)   ligands
B)   adherins
C)   cadherins
D)   integrinsE) None of the above
F) A) and C)

Question 18

The main components of the plasma membrane are

Accepted Answer

A)   lipids and ions.
B)   ions, lipids, and proteins.
C)   proteins, lipids, and carbohydrates.
D)   carbohydrates, ions, and lipids.
E)   proteins and carbohydrates.F) All of the above
G) A) and E)

Question 19

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "B"?

Accepted Answer

A)   major site of ATP synthesis when oxygen is available
B)   contains digestive enzymes
C)   site of protein synthesis
D)   directs cellular activities, contains DNA
E)   outer boundary of cell, controls entry and exit of substancesF) A) and B)
G) None of the above

Question 20

Of the organelles listed, which one does NOT contain microtubules?

Accepted Answer

A)   microvilli
B)   flagella
C)   centrioles
D)   cilia
E)   spindle fibersF) A) and B)
G) C) and E)

Exam 3: Cell Biology

Translation

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Transcription

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The plasma membrane is selectively permeable. This means

Correct AnswerverifiedShow Answer

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "B"?

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Which of the following are consistent with facilitated diffusion? (1) movement is against a concentration gradient (2) movement is with a concentration gradient (3) involves a carrier molecule (4) involves cotransport (5) involves counter transport (6) exhibits competition and saturation

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The centrioles are found in a zone of cytoplasm close to the nucleus called the

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Which of the following is NOT true of a gene?

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-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "D"?

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In ______________, carrier molecules move a substance against (up) the concentration gradient.

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The movement of water through a selectively permeable membrane is called

Correct AnswerverifiedShow Answer

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "A"?

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The "control center" of the cell is the

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Cells that respond to ligands

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Ion movement across the plasma membrane creates an electrical charge difference known as ______.

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What molecule(s) cause(s) a portion of a DNA molecule to unwind for transcription?

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-What structure does "A" represent on the diagram of the plasma membrane?

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Of the organelles listed, which one does NOT contain microtubules?

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Ribosomes are organelles responsible for

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The main components of the plasma membrane are

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What type of attachment proteins attach cells to extracellular molecules?

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