Cells : The cell: An introduction: Unit 3
organism
A functional plant or animal
slime mold
A type of protist which has a stage in its life cycle when it is not divided into cells
acellular organism
An organism not divided into cells.
vacuole
Fluid filled sacs within the cytoplasm of a cell which are bound by a membrane
Who noticed that cork has tiny "pores" or "cells"
Robert Hooke
The first man to study cells
Robert Hooke (1635 - 1703)
cell wall
Serves to give strength and rigidity to the plant cell
nucleus
The internal spherical structure in a cell which serves as the central control
cytoplasm
The living substance of a cell, excluding the nucleus
epidermis
The outer layer of cells of the stems, roots, and leaves of plants
The plasma membrane of a human cell:
acts as a selective gatekeeper
some cells are independent life forms like
amoeba
According to the Cell Theory, the _________ is the basic unit of life
cell
Two theories relating to the cell are the
cell Theory and the organismal Theory.
Cells of animals do not have
cell wall
The fibrous outer covering surrounding plant cells is the:
cell wall
all organisms are made up of
cells
Animals and man exhibit life through the physical medium of the brain and
central nervous system
Current scientific methods can conclusively distinguish between all microorganisms. True False
false
Man is more complex but otherwise belongs to the animal kingdom. True False
false
The algae Caulerpa is an example of Organismal Theory because it is not divided into cells but has many
nuclei
The cytoplasm includes all the cell's material outside the
nucleus
Any living thing with interrelated parts is considered to be a
organism
according to the Organismal Theory the _________ is the basic unit
organism
epi
outer or over
the outer covering which acts as a gatekeeper by allowing some materials into and out of the cell and excludes other materials.
plasma membrane
derma
skin
The cell theory is demonstrated by the life cycle of an organism called the
slime mold
Why do plants need cell walls?
structure and rigidity
The ___________ classification of some organisms is still uncertain.
taxonomic
unicellular organism
An organism that only has one cell for its body
Who constructed the cell theory
Schleiden and Schwann
matter
That which occupies space and has mass
cell
The basic unit of life according to the cell theory.
cell theory
The basic unit of life is the cell
organismal theory
The basic unit of life is the organism itself
plasma membrane
The semipermeable membrane surrounding the cell
life cycle
The stages of a plant or animal's life
nucleolus
They are thought to make r-RNA to construct the ribosomes
Life cannot be completely defined by the physical sciences. True False
true
A cavity located within plant cells which store food is called the
vacuole
cavities used by the cell for food storage are called
vacuoles