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October, 2006
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Plastids: Self-replicating cytoplasmic organelles of plant and algal cells that contain pigments and may synthesize and accumulate various substances. Plastid genomes are used in phylogenetic studies.

Cell Structure- Concept

JoVE 10587


Cells represent the most basic biological units of all organisms, whether it be simple, single-celled organisms like bacteria, or large, multicellular organisms like elephants and giant redwood trees. In the mid 19th century, the Cell Theory was proposed to define a cell, which states:

Every living organism is made up of one or more cells.
The cells…

 Lab Bio

Non-nuclear Inheritance

JoVE 11007

Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.

Mitochondria aresent in both plants and animal cells. They are regarded as the “powerhouses” of eukaryotic cells because they break down glucose to form energy that fuels cellular activity. Mitochondrial DNA consists of about 37 genes, and many of them contribute to this process, called oxidative phosphorylation. Chloroplasts are found in plants and algae and are the sites of photosynthesis. Photosynthesis allows these organisms to produce glucose from sunlight. Chloroplast DNA consists of about 100 genes, many of which are involved in photosynthesis. Unlike chromosomal DNA in the nucleus, chloroplast and mitochondrial DNA do not abide by the Mendelian assumption that half an organism’s genetic material comes from each parent. This is because sperm cells do not generally contribute mitochondrial or chloroplast DNA to zygotes during fertilization. While a sperm cell primarily contributes one haploid set of nuclear chromosomes to the zygote, an egg cell contribu

 Core: Biology

Cell Structure - Prep Student

JoVE 10631

Visualizing Onion and Cheek Cells
Immediately before the experiment, wash and peel onion bulbs for the class.
Remove the entire brown outer skin and cut the onion in half with a knife. Pull apart the layers of the onion. The thin, nearly transparent film layers within the onion will be used by the students.
Place the onion film into a Petri…

 Lab Bio

16S rRNA Sequencing: A PCR-based Technique to Identify Bacterial Species

JoVE 10510

Source: Ewa Bukowska-Faniband1, Tilde Andersson1, Rolf Lood1
1 Department of Clinical Sciences Lund, Division of Infection Medicine, Biomedical Center, Lund University, 221 00 Lund, Sweden

Planet Earth is a habitat for millions of bacterial species, each of which has specific characteristics. Identification of bacterial species is…

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