Sentences with phrase «whose cell nucleus»

Not exact matches

The consensus on the evolution of primitive life is that simple life forms (prokaryotes, organisms whose cells lack a distinct nucleus) inhabited the Earth about 3 - 4 billion years ago, eukaryotic cells (those with a nucleus which contains the genetic material) emerging 2 - 3 billion years ago.

In this process, the nucleus of a donor adult cell is transferred to an egg whose nucleus, and thus its genetic material, has been removed.

The advent of the nucleus — which differentiates eukaryotes (organisms whose cells contain a true nucleus), including humans, from prokaryotes, such as bacteria — can not be satisfactorily explained solely by the gradual adaptation of prokaryotic cells until they became eukaryotic.

They selected cells that had taken up the DNA and placed them in contact with cow eggs whose nuclei had been removed.

This is the first eukaryote — organisms, like plants and animals, whose cells contain distinct nuclei — found without the machinery of mitochondria.

In an accompanying paper, MacKinnon's team notes that scorpion toxin — a potent potassium channel inhibitor — has the same effect on pores in S. lividans and those of the fruit fly Drosophila, whose nuclei are organized similar to those of human cells.

One group was born from eggs whose nuclei had been replaced with genetic matter from a type of cell called a cumulus cell that surrounds the ovaries.

Experts take the cell nucleus of one human egg cell whose mitochondria have a defect and place it in an egg cell with «healthy» mitochondria.

Most biologists typically recognize three official branches of life: the eukaryotes, which are organisms whose cells have a nucleus; bacteria, the single - celled organisms that may or may not possess a nucleus; and archaea, an ancient line of microbes without nuclei that may make up as much as a third of all life on Earth (See «Will the Methane Bubble Burst?»

Prokaryotes — those organisms whose cells lack nuclei — don't have introns.

Like Dolly's creators in Scotland, Don Wolf of Portland's Oregon Health Sciences University and his colleagues transferred the nuclei from donor cells to eggs whose own DNA had been removed.

Northwestern researchers are analyzing tissue at the nano — as opposed to the micro — scale to root out cells whose nuclei have greatly expanded or otherwise show irregularities that could be signs of impending malignancy.

The researchers then transferred nuclei from nearly 1900 of the cultured cells into egg cells whose nuclei had been removed, eventually producing six calves.

Taking up this challenge, a team at Rudolf Jaenisch's lab at the Massachusetts Institute of Technology transferred the nuclei of olfactory neurons into egg cells whose nuclei had been removed.

Dolly was created using nuclear transfer, a technique in which an intact donor cell is fused with an egg whose nucleus had been removed.

At one end of the neuroepithelium, a region developed that was positive for markers of progenitors of granule and deep cerebellar nuclei projection neurons and negative for Purkinje - cell markers, and whose origins could be traced to the rhombic lip zone of the cerebellar plate.

The image shows a growing oocyte in the middle, which is very large with a bright green rim, surrounded by many small red follicle cells whose nuclei are stained blue.

In the center, FGFR - TACC fusion protein (red) can be seen disrupting tubulin bundles (green), structures that support cell division, or mitosis, at the point connecting the two daughter cells (whose nuclei are colored blue).

Here, FGFR - TACC (shown in red) can be seen interacting with tubulin bundles (green), structures that support mitosis, at the point connecting the two daughter cells (whose nuclei are colored blue).

These were the eukaryotes — mainly plants and animals, whose cells had a nucleus — and the prokaryotes, such as bacteria, whose cells did not.

Researchers studying genome and cell biology provide evidence that heterochromatin organizes large parts of the genome into specific regions of the nucleus using liquid - liquid phase separation, a mechanism well known in physics but whose importance for biology has only recently been revealed.