Question 1

Absence of a cytoskeleton might affect

Accepted Answer

A)   cell shape.
B)   the number of channel proteins in the plasma membrane.
C)   the ability of the cell to generate energy.
D)   vesicle formation.
E)   membrane transport.F) None of the above
G) A) and E)

Question 2

The "control center" of the cell is the ________.

Accepted Answer

A)   nucleus
B)   ribosome
C)   mitochondrion
D)   plasma membrane
E)   endoplasmic reticulumF) C) and E)
G) A) and B)

Question 3

The function of the Golgi apparatus is

Accepted Answer

A)   packaging and distribution of proteins and lipids.
B)   production of microtubules.
C)   excretion of excess salt.
D)   DNA replication.
E)   energy production.F) A) and E)
G) D) and E)

Question 4

The presence of a cellular clock, presence of "death genes," and damage to DNA or mitochondria are all hypotheses of ________.

Accepted Answer

A)   aging
B)   death
C)   differentiation
D)   cleavageE) C) and D)
F) B) and D)

Question 5

Which of the following is NOT true of a transmission electron microscope (TEM) ?

Accepted Answer

A)   The limit of resolution is about 0.1μm.
B)   Electrons are passed through the specimen.
C)   It gives the clearest three-dimensional images.
D)   The specimen must be fixed in plastic.
E)   The electron beam is focused with electromagnets.F) A) and E)
G) C) and D)

Question 6

Messenger RNA

Accepted Answer

A)   is synthesized when a portion of a DNA molecule is transcribed.
B)   directs the synthesis of DNA.
C)   determines the sequence of nucleotides in the anticodons of tRNA.
D)   directs the synthesis of centrioles in the cytoplasm.
E)   is not involved in the synthesis of proteins.F) C) and D)
G) B) and D)

Question 7

The vesicles containing hydrolytic enzymes are called ________.

Accepted Answer

A)   nucleus
B)   ribosomes
C)   lysosomes
D)   mitochondria
E)   centriolesF) All of the above
G) B) and E)

Question 8

Which of the following is CORRECTLY matched with its description?

Accepted Answer

A)   Channel proteins - catalyze chemical reactions inside the cell
B)   Cell identity molecules - are primarily steroids
C)   Receptor proteins - move specific ions or molecules using ATP
D)   Peripheral proteins - penetrate the lipid bilayer from one surface to the other
E)   Carrier proteins - move bound ions or molecules from one side of the membrane to the otherF) A) and E)
G) B) and E)

Question 9

Cilia and flagella are distinguished from each other on the basis of

Accepted Answer

A)   width and numbers.
B)   length and numbers.
C)   depth and numbers.
D)   length and width.
E)   None of the choices are correct.F) A) and E)
G) C) and D)

Question 10

In which structure are subunits of ribosomes manufactured?

Accepted Answer

A)   Endoplasmic reticulum
B)   Golgi apparatus
C)   Nucleolus
D)   Peroxisomes
E)   FlagellumF) None of the above
G) All of the above

Question 11

-Answer these questions about chromosome structure. What does "A" represent?

Accepted Answer

A)   Chromatid
B)   Proteins
C)   Chromosome
D)   Centromere
E)   ChromatinF) C) and D)
G) D) and E)

Question 12

Which of the following is CORRECTLY matched with its function?

Accepted Answer

A)   Channel proteins - are part of an intercellular communication system
B)   Marker molecules - are primarily steroids
C)   Receptor proteins - attach to ligand molecules
D)   Peripheral proteins - penetrate the lipid bilayer from one surface to the other
E)   Nongated ion channels - are always closedF) C) and E)
G) A) and D)

Question 13

Which type of membrane proteins form a passageway through the plasma membrane?

Accepted Answer

A)   Marker molecules
B)   Channel protein
C)   Receptor proteins
D)   Enzymes
E)   Carrier proteinsF) D) and E)
G) A) and C)

Question 14

Posttranscriptional processing is the modification of

Accepted Answer

A)   proteins to form pro-proteins.
B)   mRNA to form tRNA.
C)   pre-mRNA to form functional mRNA.
D)   exons to form introns.
E)   DNA.F) A) and D)
G) C) and E)

Question 15

All of the chemical reactions within a cell are known as cell ________.

Accepted Answer

A)   reproduction
B)   metabolism
C)   communication
D)   inheritance
E)   movementF) A) and E)
G) None of the above

Question 16

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 the choices are true.F) All of the above
G) A) and E)

Question 17

-Red blood cells (RBCs)  have been placed in three different solutions: hypotonic, hypertonic, isotonic. What is solution "B" relative to the RBC?

Accepted Answer

A)   Hypotonic solution
B)   Hypertonic solution
C)   Isotonic solutionD) A) and B)
E) A) and C)

Question 18

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

Accepted Answer

A)   cytogel
B)   cytosol
C)   vacuole
D)   centrosome
E)   proteasomeF) A) and B)
G) A) and C)

Question 19

-Answer these questions about chromosome structure. What does "D" represent?

Accepted Answer

A)   Chromatid
B)   Proteins
C)   Chromosome
D)   Centromere
E)   ChromatinF) C) and D)
G) B) and D)

Question 20

Microtubules

Accepted Answer

A)   are the smallest components of the cytoskeleton.
B)   contain the protein myosin.
C)   provide structure and support to the cytoplasm.
D)   are solid, supporting rods of protein.
E)   are a component of mitochondria.F) A) and E)
G) A) and C)

Exam 3: Cell Biology

-Red blood cells (RBCs) have been placed in three different solutions: hypotonic, hypertonic, isotonic. What is solution "B" relative to the RBC?

Correct AnswerverifiedShow Answer

Which of the following is CORRECTLY matched with its description?

Correct AnswerverifiedShow Answer

Messenger RNA

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In which structure are subunits of ribosomes manufactured?

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

Correct AnswerverifiedShow Answer

Absence of a cytoskeleton might affect

Correct AnswerverifiedShow Answer

Which type of membrane proteins form a passageway through the plasma membrane?

Correct AnswerverifiedShow Answer

Microtubules

Correct AnswerverifiedShow Answer

Which of the following is NOT true of a transmission electron microscope (TEM) ?

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The "control center" of the cell is the ________.

Correct AnswerverifiedShow Answer

The function of the Golgi apparatus is

Correct AnswerverifiedShow Answer

The presence of a cellular clock, presence of "death genes," and damage to DNA or mitochondria are all hypotheses of ________.

Correct AnswerverifiedShow Answer

-Answer these questions about chromosome structure. What does "D" represent?

Correct AnswerverifiedShow Answer

Cilia and flagella are distinguished from each other on the basis of

Correct AnswerverifiedShow Answer

-Answer these questions about chromosome structure. What does "A" represent?

Correct AnswerverifiedShow Answer

Posttranscriptional processing is the modification of

Correct AnswerverifiedShow Answer

All of the chemical reactions within a cell are known as cell ________.

Correct AnswerverifiedShow Answer

Which of the following is NOT true of a gene?

Correct AnswerverifiedShow Answer

The vesicles containing hydrolytic enzymes are called ________.

Correct AnswerverifiedShow Answer

Which of the following is CORRECTLY matched with its function?

Correct AnswerverifiedShow Answer

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