Question 1

White blood cells that take up bacteria through phagocytosis would be expected to have large numbers of

Accepted Answer

A)  mitochondria.
B)  microtubules.
C)  nucleoli.
D)  lysosomes.
E)  cilia.

Question 2

All of the following are protein components of the cytoskeleton EXCEPT:

Accepted Answer

A)  microtubules
B)  microfilaments
C)  intermediate filaments
D)  centrosomes
E)  All of these are components of the cytoskeleton.

Question 3

This diagram best shows a cell during _________ of mitosis.

Accepted Answer

A)  anaphase
B)  metaphase
C)  prophase
D)  telophase

Question 4

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

Accepted Answer

A)  simple diffusion
B)  exocytosis
C)  facilitated diffusion
D)  active transport
E)  endocytosis

Question 5

_____________ is an example of a molecule that can directly pass through the phospholipids bilayer of the plasma membrane.

Accepted Answer

A)  Carbon dioxide
B)  Potassium
C)  Sodium
D)  Glucose
E)  Calcium

Question 6

During the process of mitosis in humans,

Accepted Answer

A)  centrioles are points of attachment between chromatids.
B)  replication of DNA during interphase produces identical chromatids.
C)  when centromeres separate,there are two identical sets of 23 chromosomes.
D)  four daughter cells are produced from one original cell.
E)  All of these events will occur.

Question 7

____________ binds to one specific amino acid and has a group of three nucleotides called an anticodon.

Accepted Answer

A)  tRNA
B)  mRNA
C)  rRNA
D)  All of these choices are acceptable.

Question 8

Cell shrinkage is also called

Accepted Answer

A)  crenation.
B)  lysis.
C)  cellular dissolution.
D)  hydrostatic pressure.
E)  All of these are correct.

Question 9

Which of the following organelles are incorrectly paired with their location within the cell?

Accepted Answer

A)  nucleolus - within the nucleus
B)  cilia - on the cell surface
C)  golgi apparatus - on the cell surface
D)  microtubules - within the cytoplasm
E)  smooth endoplasmic reticulum - within the cytoplasm of the cell

Question 10

When a cell prepares to divide:

Accepted Answer

A)  the DNA is loosely coiled into chromatin and is visible when viewed with a microscope
B)  the nucleoli appear and become larger
C)  the DNA is tightly coiled into structures called ribosomes
D)  the chromosomes become tightly coiled and are visible when viewed with a microscope
E)  the nuclear envelope appears

Question 11

Sodium,potassium,and calcium ions pass through the cell membrane by

Accepted Answer

A)  diffusion after first dissolving in the phospholipid layer.
B)  active transport by carrier molecules against their concentration gradient
C)  being transported by carrier molecules.
D)  diffusion after first dissolving in enzyme molecules.
E)  diffusion after first dissolving in the phospholipid layer and diffusion through open membrane channels.

Question 12

The nucleolus

Accepted Answer

A)  is located in the cytoplasm.
B)  is the location for production of large and small ribosomal subunits.
C)  has its own distinct membrane.
D)  is important for the formation of Golgi apparatus.
E)  has all of these characteristics.

Question 13

According to the fluid mosaic model of the cell membrane,

Accepted Answer

A)  protein molecules that perform important cellular functions float in a lipid bilayer.
B)  there is a double protein layer in the plasma membrane.
C)  there are fats floating in the protein layer.
D)  carbohydrates function as membrane channels.
E)  nonpolar ends of phospholipids are exposed to water inside and outside the cell.

Question 14

Which of the following statements is TRUE concerning the cell membrane?

Accepted Answer

A)  Cholesterol within the membrane gives it added strength and flexibility.
B)  Receptor molecules are embedded in the membrane for intercellular communication.
C)  Carbohydrates bind to protein molecules thereby modifying the proteins function as a membrane channel.
D)  Receptor molecules embedded in the membrane are involved in cellular recognition.
E)  All of these statements are true of cell membranes.

Question 15

Active transport

Accepted Answer

A)  can move substances against their concentration gradient.
B)  requires metabolic energy (ATPs) .
C)  may exchange one substance for another.
D)  involves carrier molecules.
E)  All of these are characteristics of active transport.

Question 16

Given these events: 1) DNA transcribes mRNA.
2) tRNA pairs with mRNA.
3) mRNA passes from nucleus into cytoplasm.
4) Peptide bonds are formed.
The most correct sequence for the occurrence of these events in protein synthesis is

Accepted Answer

A)  1,2,3,4
B)  1,3,2,4
C)  1,2,4,2
D)  1,4,3,2
E)  4,3,1,2

Question 17

When placed in a ________ solution,a cell will exhibit a net loss of water.The specific process by which the water leaves the cell is called __________.

Accepted Answer

A)  hypertonic; osmosis
B)  hypertonic; facilitated transport
C)  isotonic; exocytosis
D)  hypotonic; osmosis
E)  hypotonic; diffusion

Question 18

Concerning the nucleus:

Accepted Answer

A)  It is surrounded by two membranes with a narrow space between them.
B)  When the cell is not dividing,it contains loosely coiled fibers of a material called chromatin.
C)  More than one nucleus may be found in certain types of cells.
D)  Materials pass into or out of the nucleus through nuclear pores.
E)  The nucleus has all of these properties.

Question 19

Our body cells perform several important functions including:

Accepted Answer

A)  cell metabolism and energy use
B)  reproduction and inheritance
C)  communication
D)  synthesis of molecules
E)  all of the above

Question 20

Which of these structures are NOT correctly matched with their description?

Accepted Answer

A)  microvilli - extensions of the cell membrane that increase surface area for absorption
B)  cilia and flagella - constructed from microtubules
C)  cilia - projections from the cell surface that move materials embedded in mucus
D)  microtubules - hollow tubules composed of protein; support the cytoplasm
E)  flagella - short projections from cell surface; many per cell

Exam 3: Cell Structures and Their Functions

All of the following are protein components of the cytoskeleton EXCEPT:

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Which of the following organelles are incorrectly paired with their location within the cell?

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The nucleolus

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When a cell prepares to divide:

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When placed in a ________ solution,a cell will exhibit a net loss of water.The specific process by which the water leaves the cell is called __________.

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Sodium,potassium,and calcium ions pass through the cell membrane by

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Our body cells perform several important functions including:

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Concerning the nucleus:

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This diagram best shows a cell during _________ of mitosis.

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_____________ is an example of a molecule that can directly pass through the phospholipids bilayer of the plasma membrane.

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During the process of mitosis in humans,

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Which of the following statements is TRUE concerning the cell membrane?

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Active transport

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Which of these structures are NOT correctly matched with their description?

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____________ binds to one specific amino acid and has a group of three nucleotides called an anticodon.

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Cell shrinkage is also called

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Given these events: 1) DNA transcribes mRNA. 2) tRNA pairs with mRNA. 3) mRNA passes from nucleus into cytoplasm. 4) Peptide bonds are formed. The most correct sequence for the occurrence of these events in protein synthesis is

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According to the fluid mosaic model of the cell membrane,

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White blood cells that take up bacteria through phagocytosis would be expected to have large numbers of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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When placed in a solution,a cell will exhibit a net loss of water.The specific process by which the water leaves the cell is called __.

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