BIOL 3510 - Cell Biology CH. 1 - Intro

Dr. Caroll Weaver - UNT

Cells are the fundamental units of life

True

Cell Biology

The study of cells and their structure, function, and behavior

Cell Theory

1. All organisms consists of one or more cells

2. The cell is the basic structure for all organisms

3. All cells arise from pre-existing cells

What is the lowest level of organization that can perform all activites required for life?

The cell

What is every cell enclosed by?

A membrane, regulating passage of materials between the cell and the environment

Viruses

Acellular and must be in a group of cells to function

Nucleotides

Building blocks for DNA and RNA

Amino Acids

Building blocks for proteins

DNA carries ___

Genetic information

What is common in all cells?

Replication, transcription, & translation

Genetic changes and selection are the basis of ____

evolution

Genes provide ____

instructions for cell form, function, and complex behavior

Within the same organism, cells have the same ____

genome

Differetiated cells express ____

different gene codes

Magnification

Englargement of the physical appearance of something.

Resolution

The ability to distinguish 2 separate points.

Micrometer

Micron, is one millionth of a meter (10^-6)

Organelles are comparable to bacterial cells in ____

size.

Bacterial cells are ___

few micrometers in diameter

Plant & animal cells are ___

10-20 times bigger than bacterial cells

Nanometer (nm)

(10^-9) Used for molecules and subcellular structures too small to be seen in the light microscope.

Angstrom

(0.1 nm) equals the size of a hydrogen atom. Measures dimensions within proteins & DNA molecules.

The invetion of ____ led to the discovery of cells.

light microscopy

Cells were first seen in ____

plants

Light Microscope