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30,000-year-old-virus revived
By: Leigh Goessl
Researchers in France have announced an ancient virus has been revived after thousands of years of lying dormant. The virus had been discovered frozen under deep layers of Siberian permafrost. When thawed, experts found it was not only an active virus, but also infectious.Frozen...
What is endocytosis?
By: Alicia M Prater PhD
Endocytosis is the process of bringing something into a cell without its passing through the cell membrane via transport. This is particularly important for polar or very large molecules. There are three generally accepted mechanisms for endocytosis: phagocytosis, pinocytosis, and receptor-mediated endocytosis.All of the...
What is exocytosis?
By: Alicia M Prater PhD
Exocytosis is a process by which cells expel something, generally large particles that cannot pass through the cell membrane. The basic process is an intracellular vesicle merging with the membrane and opening up so its contents face the extracellular milieu (see an animation). It is...
Scientists unravel secrets through examination of Neanderthal woman's DNA
By: Christine Zibas
What can we say about people who lived 50,000 years ago? Much more than just years ago, thanks to the growing body of knowledge from the collection and modern-day testing of DNA (or deoxyribonucleic acid, the encoded genetic instructions found in all known living...
By: Janet Grischy
Evolution favors efficiency. Since living things compete for living space, food, and mates, efficient organisms that are better competitors are more likely to leave successful offspring. The division of labor leads to efficiency in living things as it does in society, and therefore, different cell...
By: Erik Markusson
Bacterial cells synthesize proteins in the same manner as mammalian cells do. Both cells start synthesis by DNA polymerase transcribing double-stranded DNA into single-stranded messenger RNA (mRNA). The resulting transcript is then translated by ribosomes, another form of RNA into amino acids, the subunits of...
By: Tami Port MS
Looking for an explanation of the sometimes confusing terms 'diffusion', 'osmosis' and 'tonicity'? Look no further. Each of these concepts, how they relate to each other, and how they play out in both animal and plant cells are detailed below. * What Is Diffusion? *...
Ribosomes: an explanation
By: Barnabas Stinson
If you've taken a biology course, you've probably heard of these little guys. The name might be familiar, but how exactly do these tiny machines work? What are they for and where do they come from?First let's talk about what a ribosome is. A...
Comparison of sexual and asexual reproduction
By: Tami Port MS
Some living things reproduce by cloning; producing offspring genetically identical to the parent. Organisms that procreate sexually "mix it up" genetically to create truly unique offspring. * Prokaryote Binary Fission * Many single-celled organisms reproduce by binary fission; the splitting of a parent cell after...
By: John Gugie
I believe that genetic altering is right, if done for the right reasons and under the right conditions.I can understand genetic altering being done to prevent specific illnesses or disabilities. While I think that it should be done for these reasons, I do not...

 

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