Sentences with phrase «celled organisms did»

There is substantial evidence that one - celled organisms did in fact give rise to the modern world.

Single - celled organisms don't need sex.

Not exact matches

The world is filled with complex organisms, but why do we still have those silly one celled organisms?

The organism (and especially the cell) was to them a «black box»» a machine that does wonderful things by some mechanism nobody knows.

All an evolutionary storyteller has to do is to start with the apparently simplest version, ignore the neural equipment that has to be present for an organism to make any use of a «photon receptor,» and spin a charming tale about how a tiny primitive light - sensing cell might grow up to be a full - fledged eye.

The single cell organism has an ancestor who probably came to earth frozen ice attached to a meteor that was blown off a distant plant due to some sort of plantary collision between a comet and a planet or two planets, or even a large meter collision... Evolution does not require that you believe to exist, it simply exists.

Recombinant DNA research has been done primarily on bacteria, one - celled organisms smaller than animal or plant cells and simpler in structure, yet capable of very complex chemical activity.

When you say miracle of life, do you mean conception of a child in todays world or are you talking about single - celled organisms at the advent of life on earth?

Unlike most other philosophers of science, he does not immediately cast scorn on the likes of William Dembski and Michael Behe, who have focused on the apparent design of cells and organisms.

But the discovery of genetic identities between human cells and those of most other organisms does not negate the distinctiveness of human beings.

Once single - cells combined to form multi-celled organisms, how did those organisms get more complex to form organisms that had a brain and more complex parts?

The second question has in fact two facets: (a) how does it arise in the development of the individual organism during the process of growth from the moment of fertilization of the egg; and (b) how does the egg itself come to get that way — that is to say, how can we conceive of evolution as having «designed» the cell?

Birch and Cobb maintain that the ecological model is more adequate than the mechanical model for explaining DNA, the cell, other biological subject matter (as well as subatomic physics), because it holds that living things behave as they do only in interaction with other things which constitute their environment (LL 83) and because «the constituent elements of the structure at each level (of an organism) operate in patterns of interconnectedness which are not mechanical» (LL 83).

Called absentminded, they are in fact present - minded, because they do this in order to be present with some particular point of the world — to love it and know it — the artist and lover with a particular face, for instance, the scientist with a particular cell or organism.

If that doesn't help: when did certain single cell organisms decide to be plants and others decide to be vegetation eating animals?

If you claim that as a single cell it has value of a person, then the trillions of single cell organisms you kill every day... they have less value simply because they don't have human DNA?

No, they don't pop out of the ether, they evolve from single cell organisms.

No testing of these nanoparticles has been done so far in living cells or organisms.

The cells or organisms could be in a plate or dish, or in the head of a mouse; it doesn't matter.

But something did change about 800 million years ago, and cyanobacteria and other minute organisms in continental margin ecosystems got more phosphorus, the backbone of DNA and RNA, and a main actor in cell metabolism.

But there are also certain things that if an investigator like [s] to do, and I came from cellular neurobiology having learnt from Grundfest and from Wade Marshall and from my period at the NIH how to study nerve cells in the brain; and I was until that point studying complex organisms — a cat; Aplysia fitted me to a tee.

John Glass, a senior microbiologist in the synthetic biology group at the J. Craig Venter Institute in Rockville, Maryland, puts it this way: If you can imagine a set of genes that will program a cell to do something — anything — then you can make them «at a reasonable cost and test your hypothesis... so it will be possible to attempt to design organisms that have extraordinary properties to solve human needs.»

Even so, Wilmut's experiment provides a long - sought confirmation that adult cells do in fact contain workable versions of all the genes necessary to produce an entire organism.

But they don't have the slop of higher cells and higher organisms.

Before now, a lot of this epigenetic research had been done in yeast — single cell organisms that also use enzymes to lay chemical tags on histone proteins.

How do individual biomolecules move in live cells, tissues, or organisms?

To do this without a brain or nervous system, says Ken Showalter, a chemist at West Virginia University, the organism relies on proteins and nutrients that «swish back and forth» through the cell to communicate the location of the food and allow the organism to change shape.

The virus doesn't kill the cell, but it suppresses transcription and translation of genes, so the organism as a whole suffers but the individual cell looks OK.

Telomerase, the enzyme that repairs telomeres, is only active during pregnancy; i.e. healthy cells in an adult organism do not express telomerase.

How does an egg, a tiny squishy blob of a cell, grow into a fully formed organism — a sinuous worm, a delicate fly, a perfect human baby?

How does a single - celled organism, one of the simplest life forms on Earth, manage to satisfy its nutritional needs?

There's a lot of attention right now on how neurons fire and interact with each other, but the truth is, we don't even understand how a brain develops — even in the most simple of organisms like C. elegans, a worm with only 300 brain cells.

Of course, bacteria are single - celled organisms and don't have brains, he said.

«All organisms with complex cells have sex, so why is it that simple, single - celled organisms never evolved to do so?

Tschinkel believes that an ant colony grows just as a single organism does, by rules that guide interactions among its cells and between it and its environment, a process called embryogenesis.

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

Nevertheless, this type of cell has a very short lifespan, limited to the first days of embryonic development, and they do not exist in any part of an adult organism.

In single - celled organisms, reproduction does not require sex, nor does sex always produce offspring.

Scientists typically don't classify viruses as living organisms, but giant viruses like these, with their own protein - making machinery and other functions normally carried out in living cells, blur the lines between what's alive and what isn't.

Antibiotics and other modern medicines do not work on viruses because these radically simple organisms infiltrate cells and hijack their processes to serve their own purposes.

«Traditionally, people didn't think of a single - celled organism needing to communicate with each other.

«How does a multicellular organism make that next great leap to differentiated cell types that work cooperatively in the organism?»

I didn't groan at this idea unlike most other Star Wars fans — many of whom were outraged by the perceived reduction of the Force from a grand, almost magical power to a function of biology — because I'm a biologist who studies bioenergetics: How organisms convert various molecules (food) into chemical energy (adenosine triphosphate or ATP, a compound that enables energy transfer between cells) that can be used to power life.

«In those simple organisms, scientists teased out exactly what the repeat region was doing, and the same principles were at work in human cells.

In the case of sequence data, metadata can encompass what organism or cell was sequenced, where it came from, what it was doing, quality metrics, and a spectrum of other characteristics that add value to the sequence data by providing context for it and enabling greater biological understanding of the significance of the sequence.

So while it's true that organisms living deep in the Earth are not exposed to the high - energy radiation found when you travel between planets or more hypothetically between stars, the systems that cells have evolved to repair damage done by reactive oxygen species will be useful whether they arise from rocks or from cosmic rays.

Biochemical reactions that are responsible for the metabolism of living organisms do not proceed in a test tube: most of them take place in a confined space of a cell, on or even within a biological membrane.

Often, their behavior does not reflect their biological function within an entire organ or organism, which, for example, turns studying human liver cells into a big challenge.

Thus far (2016), there is no organism it doesn't work on (CRISPR has been used successfully on human cells, but not yet in viable human embryos).

«If you're a cell embedded in an organism's tissue, you don't willy - nilly divide — that's considered very antisocial behavior.