The cellular & Tissue Levels of Organization

Question 1

All living cells in multicellular organisms have a surrounding ______

Answer 1

Cell Membrane

Question 2

As the outer layer of your skin separates your body from its environment, the cell membrane also known as the _________ Separates the inner contents of a cell from its exterior environment

Answer 2

Plasma Membrane

Question 3

It provides a protective barrier around the cell and regulates which material can pass in or out

Answer 3

Cell membrane

Question 4

_________ are the structural units of all living things

Answer 4

Cells

Question 5

The human body contains _________ of these tiny building blocks.

Answer 5

50 to 100 trillion

Question 6

According to the ,_________ the activities of cells are dictated by their _________ which determines _________ , Continuity of life has a cellular basis. Most cells are composed of four elements (C, H, O, N).

Answer 6

Principle of complementary
Structure (Anatomy)
Function (Physiology)

Question 7

Is a term used in biology that refers to a dynamic state of balance within parameters that are compatible with life

Answer 7

Homeostasis

Question 8

Cell may be shaped liked a flat plate (squamous) and live only for a short time before it is shed and replaced.

Answer 8

Structural skin

Question 9

Provide a protective barrier for the cells and tissues that lie beneath

Answer 9

Squamous skin cells

Question 10

May be shape something like a star, sending our long processes up to a meter in length and may live for the entire lifetime of the organisms. With their long winding appendages, nerve cells can communicate with one another and with other types of body cells and send rapid signals that inform the organism about its
environment and allow it to interact with that environment.

Answer 10

Nerve Cell

Question 11

A primary responsibility of each cell is to contribute to ________

Answer 11

Homeostasis

Question 12

Control center of the Cell

Answer 12

Nucleus

Question 13

Contains genetic material known as _______

Answer 13

Deoxyribonucleic acid or DNA

Question 14

This is needed for building proteins

Answer 14

DNA

Question 15

DNA is necessary for

Answer 15

Cell reproduction

Question 16

_________Consist of a double membrane that bounds the nucleus
Contains _____ that allow for exchange of material with the rest of the cell
Encloses the jellylike fluid called the _______

Answer 16

Nuclear envelope
Nuclear pores
Nucleoplasm

Question 17

_________ Contains one or more dark-staining nucleoli
Sites of ribosomes assembly
Ribosomes migrate into the _________ through _________ to serve as the site of protein synthesis

Answer 17

Nucleolus
Nucleus
Cytoplasm
Nuclear pores

Question 18

Composed of DNA wound around histones (protein)

Scattered throughout the nucleus and present when the cell is not dividing

Condenses to form dense, rodlike bodies _________ when cells divides

Answer 18

Chromatin
Chromosomes