Cell Theory and Microscopy Lecture

Vocabulary flashcards based on lecture notes covering the history, tenets, and exceptions of Cell Theory, as well as viral structure and abiogenesis.

Classical Cell Theory

A biological theory stating that: $1$. All living organisms are composed of one or more cells; $2$. The cell is the basic unit of structure and function; $3$. All cells arise from pre-existing cells.

Robert Hooke

The scientist who discovered the cell in the year $1665$.

Schlieden & Schwann

The scientists who stated the first two tenets of Cell Theory.

Rudolf Virchow

The scientist who stated the tenet: "Cells Arise from Pre-existing Cells".

August Weismann

A scientist whose contributions to the discovery of the cell are noted up to the year $1880$.

Modern Cell Theory

An updated perspective on cell biology supported by modern techniques like electron microscopy and molecular biology.

Viruses

Exceptions to cell theory that are acellular, obligate intracellular parasites consisting of genetic material enclosed in a protein coat ($capsid$).

Capsid

The protein coat of a virus that encloses genetic material like $DNA$ or $RNA$, and is sometimes surrounded by an outer lipid envelope.

Abiogenesis

The hypothesis describing how the first cell originated from non-living matter rather than a pre-existing cell.

First Cell Hypothesis

The theory that the first cell may have arisen from Hydrothermal Vents and Self-Replicating Molecules like $RNA$.

RBCs and Sieve tube cells

Specific cell types that lack a nucleus and cannot divide to form new cells, making them exceptions to classical cell theory.

Viroids and Prions

Non-cellular infectious agents listed as exceptions to the classical cell theory alongside viruses.