Ch. 3 Cellular Level of Organization

Question 1

___ are the basic, living structural and functional units of the body.

Answer 1

Cells

Question 2

The principal parts of a cell are the plasma membrane, the ____, and the nucleus

Answer 2

Cytoplasm

Question 3

Each chromosome in the nucleus is a ___ molecule associated with several proteins

Answer 3

DNA

Question 4

The net movement of a solvent through a selectively permeable membrane is called ___

Answer 4

Osmosis

Question 5

___ is the measure of a solution’s ability to change the volume of cells by altering their water content

Answer 5

Tonicity

Question 6

____ supply a mechanical support for cell strength and shape, and generate movement

Answer 6

Microfilaments

Question 7

____ ____ help give stability to the position of organelles

Answer 7

Intermediate filaments

Question 8

____ help determine cell shape, move organelles, and are components of cilia and flagella

Answer 8

Microtubules

Question 9

___ are structures with specific shapes that perform specific cell functions

Answer 9

Organelles

Question 10

____ are single, long, whiplike structures that move an entire cell

Answer 10

Flagella

Question 11

Ribosomes are the sites of what?

Answer 11

Protein synthesis

Question 12

Human cells have ___ pairs of chromosomes

Answer 12

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