Chloroplast

Amoeboid

Amphiesma

Aperture

1) Virus which infects and destroys a bacterial host. Some phages, however, will incorporate their DNA into that of their host, and remain dormant for an extended period. For this reason, they have become essential tools of genetic engineers.

2) Having no definite shape to the cell, able to change shape.

3) The protein "shell" of a free virus particle.

4) The outer covering of a dinoflagellate, consisting of several membrane layers.

5) Small opening, for example the opening in the test of a foram.

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Cell

Cell membrane

chloroplast

1) Complete sequence of steps which must be performed by a cell in order to replicate itself, as seen from mitotic event to mitotic event. Most of the cycle consists of a growth period in which the cell takes on mass and replicates its DNA. Arrest of the cell cycle is an important feature in the reproduction of many organisms, including humans.

2) Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.

3) Rigid structure deposited outside the cell membrane. Plants are known for their cell walls of cellulose, as are the green algae and certain protists, while fungi have cell walls of chitin.

4) A chlorophyll-containing plastid found in algal and green plant cells.

5) The outer membrane of a cell, which separates it from the environment. Also called a plasma membrane or plasmalemma

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