lesson 1 unit 3 A
Any living thing with interrelated parts is considered to be a(n) .
organism
Why do plants need cell walls?
structure and rigidity
The classification of some organisms is still uncertain.
taxonomic
Acellular organisms
An organism not divided into cells.
unicellular organism
An organism that only has one cell for its body.
Current scientific methods can conclusively distinguish between all microorganisms.
False
vacuole
Fluid filled sacs within the cytoplasm of a cell which are bound by a membrane. Some types contain food as it is being digested, others fill up most of the cell as in some plant cells.
matter
That which occupies space and has mass.
Life cannot be completely defined by the physical sciences.
True
The plasma membrane of a human cell:
acts as a selective gatekeeper
The is an example of Organismal Theory because it is not divided into cells but has many .
algae Caulerpa nuclei
A cavity located within plant cells which store food is called the .
vacuole
Two theories relating to the are the Theory and the organismal Theory.
Cell Organismal
Man is more complex but otherwise belongs to the animal kingdom.
False
cell
The basic unit of life according to the cell theory.
organismal theory
The basic unit of life is the organism itself, which may be divided into cells for efficiency.
cell theory
The idea of Schleiden and Schwann that the basic unit of life is the cell, and that all living organisms are composed of cells.
nucleus
The internal spherical structure in a cell which serves as the central control.
cytoplasm
The living substance of a cell, excluding the nucleus.
cell wall
The outer covering found in plant cells outside of the plasma membrane. It is made of a double layer of cellulose, and serves to give strength and rigidity to the plant cell.
epidermis
The outer layer of cells of the stems, roots, and leaves of plants.
plasma membrane
The semipermeable membrane surrounding human and animal cells that is made of phospholipids and proteins.
nucleolus
The small, dark structures within the nucleus of a cell. They are thought to make r-RNA to construct the ribosomes.
life cycle
The stages of a plant or animal's life.
organism
A functional living thing, unicellular or multicellular containing interrelated parts.
slime mold
A type of protist which has a stage in its life cycle when it is not divided into cells.
Animals and man exhibit life through the physical medium of the and central nervous system.
brain
According to the Cell Theory, the is the basic unit of life; according to the Organismal Theory the is the basic unit.
cell organism
Cells of animals do not have:
cell wall
The fibrous outer covering surrounding plant cells is the:
cell wall
According to the Bible, "" was given by God.
life
