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2021-05-14

What describes the termination of transcription in prokaryotes?

What describes the termination of transcription in prokaryotes?

Termination in Prokaryotes Once a gene is transcribed, the prokaryotic polymerase needs to be instructed to dissociate from the DNA template and liberate the newly-made mRNA. Depending on the gene being transcribed, there are two kinds of termination signals: one is protein-based and the other is RNA-based.

Which of the following best characterizes the termination of transcription?

Transcription terminates when the polymerase reaches the promoter of the adjacent downstream gene. Transcription terminates when the polymerase reaches the start codon of the adjacent downstream gene.

What is the termination phase of transcription?

Transcription termination RNA polymerase will keep transcribing until it gets signals to stop. The process of ending transcription is called termination, and it happens once the polymerase transcribes a sequence of DNA known as a terminator.

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What RNA polymerase is used in prokaryotic transcription?

Prokaryotes utilize one RNA polymerase for all transcription of types of RNA. In contrast, eukaryotes utilize three slightly different RNA polymerases: RNA polymerase I, RNA polymerase II, and RNA polymerase III (8). Each of the three RNA polymerases in eukaryotes is responsible for transcribing a unique type of RNA.

What are the major differences between bacterial and eukaryotic transcription?

Eukaryotic genes are split into exons and introns; in bacteria, genes are almost never split. 7. In eukaryotes, mRNA is synthesized in the nucleus and then processed and exported to the cytoplasm; in bacteria, transcription and translation can take place simultaneously off the same piece of DNA.

Why do prokaryotes only have one RNA polymerase?

Bacteria only have a single polymerase to take care of each duty that RNA polymerases have. Where as Eukaryotes (Figure 1) have three separate polymerases, one according to each different type of RNA transcript that is synthesized. Eukaryotes have three distinct polymerases.

Do prokaryotes only have one RNA polymerase?

Prokaryotes have only one RNA Polymerase, while eukaryotes have three (RNA Polymerases I, which transcribes rRNA; II, which transcribes mRNA; and III, which transcribes tRNA).

Which is true of RNA polymerases in both prokaryotic and eukaryotic organisms?

Question 16 1 pts Which is true of RNA polymerases in both prokaryotic and eukaryotic organisms? They have the same number of cofactors in prokaryotes and eukaryotes. They make copies of RNA from either DNA or RNA templates. There is a single enzyme type per organism.

Is DNA a prokaryote?

Most prokaryotes carry a small amount of genetic material in the form of a single molecule, or chromosome, of circular DNA. The DNA in prokaryotes is contained in a central area of the cell called the nucleoid, which is not surrounded by a nuclear membrane.

Where is the DNA in a prokaryote?

Genetic information in prokaryotic cells is carried on a single circular piece of DNA which is attached to the cell membrane and in direct contact with the cytoplasm. There is no enclosing membrane, so there is no true nucleus, but simply a concentration of DNA known as a nucleoid.

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Does bacterial DNA have histones?

The answer. Histones. DNA is wrapped around these proteins to form a complex called chromatin and allows the DNA to be packaged up and condensed into a smaller and smaller space. In almost all eukaryotes, histone-based chromatin is the standard, yet in bacteria, there are no histones….

Are histones absent in bacteria?

Evolution and species distribution. Core histones are found in the nuclei of eukaryotic cells and in most Archaeal phyla, but not in bacteria.

Does bacterial DNA form nucleosomes?

Note that only eukaryotes (i.e., organisms with a nucleus and nuclear envelope) have nucleosomes. Prokaryotes, such as bacteria, do not.

What is the difference between DNA and Chromatin?

Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell’s genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus.

Why is nucleosome formation required for the packaging of DNA?

Why is nucleosome formation required for the packaging of DNA? Nucleosome formation results in compaction of the DNA to form chromatin. Nucleosome is composed of eight histone proteins attached to DNA, forming a compact tight loop of DNA. Define gene in your own words.

Where is RNA found in a cell?

Deoxyribonucleic Acid (DNA) is found mainly in the nucleus of the cell, while Ribonucleic Acid (RNA) is found mainly in the cytoplasm of the cell although it is usually synthesized in the nucleus.

Why is DNA important to society as a whole?

DNA is vital for all living beings – even plants. It is important for inheritance, coding for proteins and the genetic instruction guide for life and its processes. DNA holds the instructions for an organism’s or each cell’s development and reproduction and ultimately death….

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How has DNA changed the world?

The discovery of DNA has radically changed the way we breed and utilise crops and the means by which we recognise and protect our plant biodiversity. It has accelerated our ability to breed crops with desirable traits such as disease resistance, cold and drought tolerance….

Which best describes the advantage of pest resistance?

Which best describes the advantage of pest resistance? Farmers do not have to use harsh chemicals to save their crops. Why might genetically engineering a crop to be herbicide resistant result in producing weeds that are herbicide resistant? The weeds that are not affected by the herbicide are able to reproduce.

Which is an environmental concern that affects society?

Our Mother Earth is currently facing a lot of environmental concerns. The environmental problems like global warming, acid rain, air pollution, urban sprawl, waste disposal, ozone layer depletion, water pollution, climate change and many more affect every human, animal, and nation on this planet.

Do you agree with using genetically engineered products in the food supply explain your response?

Answer Expert Verified Yes, I agree with using genetically modified products in the food supply. They, alone, do not pose a risk to human health at all. Genetically engineered products can be modified to be more resistance to disease, which, without GMOs, could decimate a plant supply vital to many people….

What occurs at step 4 in the diagram?

What occurs at step 4 in the diagram? The foreign DNA is placed in a mechanical vector for cloning. The foreign DNA is inserted into the host cell genome.