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chapter 3 part 2

front 1

Some types of cells move freely through the body, while others are bound into tightly knit communities.

back 1

True

front 2

________ is a molecular "ferry" that brings amino acids to the ribosome to build a protein.

back 2

t-RNA

front 3

There is only one cell type in the human body that has a flagellum.

back 3

True

front 4

DNA transcription is another word for DNA replication.

back 4

False

front 5

In which stage of mitosis do the identical sets of chromosomes uncoil and resume their chromatin form?

back 5

telophase

front 6

Which of the following names the three main parts of a human cell?

back 6

cytoplasm, plasma membrane, and nucleus

front 7

The RNA responsible for bringing the amino acids to the ribosome for protein formation is ________.

back 7

tRNA

front 8

Each daughter cell resulting from mitotic cell division has exactly as many chromosomes as the parent cell.

back 8

True

front 9

Which of the following is NOT a concept of the cell theory?

back 9

Cells are given life through a process known as spontaneous generation.

front 10

The plasma membrane is made primarily of ________.

back 10

phospholipids

front 11

The figure is of which cellular organelle?

back 11

a mitochondrion

front 12

Which of the following would not be a constituent of a plasma membrane?

back 12

messenger RNA

front 13

What is the primary function of the mitochondria?

back 13

They are the main sites of ATP production.

front 14

Which of the following is characteristic of cilia?

back 14

They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.

front 15

Why is the selective permeability of the plasma membrane essential for normal cell function?

back 15

Selective permeability allows cells to exclude some substances and allow others to pass into or out of the cell.

front 16

The functions of centrioles include ________.

back 16

organizing the mitotic spindle in cell division

front 17

What type of protein is indicated by the arrow?

back 17

histone

front 18

Passive membrane transport processes include ________.

back 18

movement of a substance down its concentration gradient

front 19

________ is the diffusion of a solvent, such as water, across a selectively permeable membrane.

back 19

Osmosis

front 20

Which vesicular transport process occurs primarily in some white blood cells and macrophages?

back 20

phagocytosis

front 21

If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?

back 21

The cells will lose water and shrink.

front 22

The main component of the cytosol is ________.

back 22

Water

front 23

Once solid material is phagocytized and taken into a vacuole, which of the following statements best describes what happens?

back 23

A lysosome combines with the vacuole and digests the enclosed solid material.

front 24

The electron microscope has revealed that one of the components within the cell consists of pinwheel array of 9 triplets of microtubules arranged to form a hollow tube. This structure is a ________.

back 24

centriole

front 25

Lipid rafts, found in the cell outer membrane surface, are concentrating platforms for certain receptor molecules or for protein molecules needed for cell signaling..

back 25

True

front 26

Which of the following statements correctly describes the plasma membrane?

back 26

It is a dynamic fluid structure that is in constant flux.

front 27

Lysosomes perform digestive functions within a cell.

back 27

True

front 28

Which of the following is FALSE regarding the membrane potential?

back 28

The resting membrane potential is maintained solely by passive transport processes.

front 29

Some hormones enter cells via ________.

back 29

receptor-mediated endocytosis

front 30

Which set of membrane proteins in the figure depicts the transport of solute molecules?

back 30

A

front 31

What is the function of the indicated protein?

back 31

to allow DNA to form a compact structure

front 32

The structure indicated by B is ______.

back 32

the Golgi apparatus

front 33

Which of the following is a principle of the fluid mosaic model of cell membrane structure?

back 33

Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.

front 34

The orderly sequence of the phases of mitosis is prophase, metaphase, anaphase, and telophase.

back 34

True

front 35

What must happen before a body cell can begin mitotic cell division?

back 35

Its DNA must be replicated exactly so that identical copies of the cell's genes can be passed on to each of its offspring.

front 36

What is the specific role of the enzyme indicated by B during the formation of the new DNA strands?

back 36

joining the nucleotides that form the new DNA strand

front 37

During DNA replication, the covalent bonding of nucleotides into a new strand of DNA is performed by ________.

back 37

DNA polymerase

front 38

Diffusion is a form of active transport.

back 38

False

front 39

What is a function of the enzyme indicated by structure A?

back 39

breaking the bonds between complementary base pairs

front 40

Which of the following describes the plasma membrane?

back 40

the phospholipid bilayer surrounding the cell