Roger lovingly describes radiolarians, some of which build skeletons of strontium sulfate while others manage to eat multicelled
But challenging generations of yeast with conditions that make solo life tough led to spiky multicelled yeast forms within about two months, said Will Ratcliff of the University of Minnesota, Twin Cities.
To see if yeast snowflakes evolve the way true multicelled creatures do, the researchers created another version of the settle-fast-or-else challenge that varied in severity.
These mats of single-celled organisms dominated the fossil record for billions of years before true multicelled
The research team may indeed have found multicelled
creatures living in anoxic conditions, but the evidence for those creatures having hydrogenosomes still looks preliminary, cautions Johannes Hackstein of Radboud University Nijmegen in the Netherlands, who studies the organelles.
When Mehta and Baross sequenced a bit of DNA, they found that FS406-22 is an anaerobic archaean, a one-celled organism that looks like a bacterium but has chemical similarities to multicelled
After the cell divides and grows into a multicelled
embryo, researchers doing therapeutic cloning extract stem cells that carry the same genetic signature as that of the donated nucleus.
In the era before multicelled
animals appeared some 550 million years ago, extreme cold may have clutched Earth in a death grip for millions of years.
Wood says that, as in plants, the luciferase gene will be a powerful new reporter gene for multicelled
In addition, the exhibit contains fossil records of life as it began to advance and diversify; on display are remains of single-celled, nucleus-containing creatures that lived 1.3 billion years ago, as well as 570-million-year-old jellyfish and other soft-bodied, multicelled