Nucleus accumbens

The evolutionary benefit of a membrane-bound nucleus is that it allows for additional level of regulating gene expression. Eukaryotic cells can effectively control the rate of mRNA transport out of the nucleus for translation in the cytoplasm because membranes act as a barrier. Prokaryotes which only has a single membrane can only control the rate which DNA is transcribed by regulating activation of proteins needed for transcription/translation while eukaryotic cells can regulate gene expression

instructions from DNA. Proteins from the cytoplasm enter the the nucleus through the nuclear pores and combine with rRNA to make subunits of ribosomes. The small and large subunits of ribosomes then exit the nucleus also through the nuclear pores and then join in the cytoplasm to make a ribosome. Ribosomes are either bound or free in the cytoplasm. Free ribosomes in the cytoplasm make proteins that function in the cytoplasm. Bound ribosomes are bound to the nuclear envelope or the rough endoplasmic

cell. Do plants and animal cells have mitochondria? Yes, both plan and animal cell shave mitochondria. They are similar because they are both eukaroyotic cells, which means they have several features in common; cell membrane, cell organelles, nucleus, mitochondria, and endoplasmic reticulum. From where are mitochondria inherited? In humans, our mitochondria come from the cytoplasm of the ovum, or egg cell. Unlike nuclear DNA, which comes from both parents, mitochondrial comes only from our

Cell The earthworm is an eukaryote because it contains cells with nuclei. Moreover, the earthworm is a multicellular organism which means that it is an eukaryote as prokaryotes are unicellular. The lumbricus terrestris consists of several segments. These segments are referred to as septa. The middle segments have bristles called setae, which help the worm move around. It also has five hearts which are all used to circulate blood throughout the body of the worm. On the exterior, the earthworm has

essential to eukaryotes, undoubtedly the nucleus is the most important. Yet, many argue that the mitochondrion or endoplasmic reticulum (ER) are equally if not more important to cellular function. Although both organelles have similarities with the nucleus and work with it to complete various functions it is evidential that the nucleus is more crucial. The Nucleus: The nucleus’ presence is used to classify cell as a eukaryote rather than prokaryote. The nucleus is the most prominent organelle within

Seitoshi no tani (The Valley of Life and Death) As the days passed by I made only a little progress in my endeavors trying to contact the others was a nightmare especially because of the constant patrols near the cells and if any loud noise was made near them the guards would come running to see the commotion and search the cells. It seems that these Cultists have experience dealing with breakouts before which made them all the more dangerous, but I had learned the names of the 2 people next to

Prior the conduction of this experiment, Sordaria of different ascus types (WT and T) were exposed to significant levels of radiation. There were three experimental groups for this experiment and crosses accordingly. Crosses were set up in containers by placing different Sordaria groups in alternating fourths of the mating agar. The Sordaria naturally grew outwards to the different adjacent Sordaria groups and inter-mated through meiosis. This provided a variety of different crosses throughout

carry out its function which is reproduction and growth. There are important organelles that the eukaryotic cell needs, one of which is that the nucleus is present. The nucleus acts as the brain of the eukaryotic cell. DNA is found in the nucleus which holds all the genes and also controls the cell. The cells function is to reproduce, which needs the nucleus to do this. To carry out another function which is to reproduce, the chromosomes which are found in the DNA are needed and copied. The cell also

A Survey of Eukaryotic Cells and Microorganisms HISTORY OF EUKARYOTES: 1. Evidence indicates that the first Eukaryotic cells first appeared on the earth approximately 2 billion years ago. Fossilized cells appear in shale sediments from China, Russia and Australia the date from 850-950 million years ago. 2. Biologists have discovered evidence to suggest that the eukaryotic cell evolved from prokaryotic organisms by a process of intracellular symbiosis. 3. Some of the organelles that

Cells were divided into two, which are, prokaryotic and eukaryotic cells. Examples of prokaryotic cells are Bacteria and Archae, while the examples of eukaryotic cells are Protists, Fungi, plants and animals. All cells share certain basic features, but the major difference between prokaryotic and eukaryotic cells is their DNA. Thus, these two cells have different features on DNA transcription and protein synthesis mechanisms. The general processes of transcription may be applied to both prokaryotic