Chapter 3 Cells

Question 1

What is the basic structural unit of the body?

Answer 1

Cell

Question 2

The selective movement ions through a membrane occurs through areas called _____.

Answer 2

Channels

Question 3

Channels

Answer 3

A Channel is an abstract conception of an opening in a membrane that may selectively allow certain substances to pass; a pore is a relatively fixed opening

Question 4

Insulin usually increases the movement of glucose through a cell membrane by a process called _____.

Answer 4

Facilitation diffusion

Question 5

The process, which divides the cytoplasm in half, is specifically termed ____.

Answer 5

Cytokinesis

Question 6

Oncogenes

Answer 6

Oncogenes are tumor genes that encode information that will initiate abnormal development of cells and possible cancer;this is why some cancers are said to be genetic in origin or tend to run in families

Question 7

Cell membrane

Answer 7

The cell membrane is a complex, constantly changing region comprised of layers of molecules that actively controls permeability

Question 8

T or F: The phospholipid molecules of a membrane are arranged to have their phosphate ends facing the exterior surface.

Answer 8

T ;
The phosphate groups give the layer its water solubility (exterior) while the internal fatty acid ends are hydrophobic or water insoluble

Question 9

T or F: Cholesterol is a lipid that tends to make cell membranes more rigid with it than without it

Answer 9

T;
Cholesterol in a membrane provides a degree of stable rigidity to the structure of the otherwise oily lipids