lesson 1 unit 3 A

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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


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