Different mRNA molecules can have poly-A tails of different lengths. Considering the purpose of adding the poly-A tail (from the previous question), why are some tails longer than others?

Answers

Answer 1

Answer:

Answer: Then the longer it is, the more it protects against degradation. Proteins that are needed over a long period of time come from a long tailed mRNA.

Explanation:

Messenger RNA (mRNA) is the ribonucleic acid that transfers the genetic code from the DNA of the cell nucleus to a ribosome in the cytoplasm. It determines the order in which the amino acids in a protein will bind and acts as a template or pattern for the synthesis of that protein.

Messenger RNA is synthesized in the cell nucleus in eukaryotes from the process called DNA transcription. In most cases, once this messenger RNA has been synthesized, it must be matured (RNA maturation). This involves the removal of intercalary sequences called non-coding introns from the protein to be synthesized. Then, the addition of a structure called CAP to the 5' end, which is a modified guanine nucleotide needed for the normal process of DNA transplantation and maintaining its stability. This is critical for proper recognition and access of the ribosome. Also, polyadenylation which is the addition of the sequence called Poly-A to the 3' end. The Poly-A sequence is made up of several adenine molecules and is located at about 20-30 bp towards the tail (AAPAA sequence) or polyadenylation signal, which protects the end of the mRNA. The polyadenylation helps to increase the period of the message, so that the transcription lasts longer in the cell and therefore more protein is translated and produced.

This mature messenger RNA is transferred to the cell's cytoplasm, in the case of eukaryotes, through pores in the nuclear membrane. The messenger RNA in the cytoplasm is coupled to the ribosomes, which are the machinery in charge of protein synthesis. However, after a certain amount of time the mRNA is degraded into its component nucleotides, usually with the help of ribonucleases. So, an mRNA with a short tail will have a shorter lifespan.

Then, proteins that are needed over a long period of time come from a long tailed mRNA. And proteins that are briefly nedded come from a short tailed mRNA. This is because, as explained, the Poly-A tail serves to protect the mRNA molecule from degradation. So, then the longer it is, the more it protects against degradation.

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Echinoderms, like sea stars, have a nervous system. A) Ring- like B) ladder- like C) Nerve net

Answers

The correct answer to the question which is stated above is letter c. Nerve net.

Echinoderms, like sea stars, have a Nerve Net nervous system.

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Answers

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Archaea are different from bacteria in that archaea

Answers

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Which statements about the regulation of transcription initiation in these genes are true?1) The fantasin gene will be transcribed at a high level when activators specific for control elements A, B, and C are present in the cell. 2) Both the fantasin gene and the imaginin gene will be transcribed at high levels whenever general transcription factors are present in the cell. 3) The imaginin gene will be transcribed at a high level when repressors specific for the imaginin gene are present in the cell. 4)Control elements C, D, and E are distal control elements for the imaginin gene. 5)The fantasin gene and the imaginin gene have identical enhancers. 6)Control elements A, B, and C are proximal control elements for the fantasin gene 7)Both the fantasin gene and the imaginin gene will be transcribed at high levels when activators specific for control elements A, B, C, D, and E are present in the cell.

Answers

a and c are the elements

Final answer:

Statement 1 is true, Statement 2 is false, Statement 3 is false

Explanation:

1) Statement 1 is true. The fantasin gene will be transcribed at a high level when activators specific for control elements A, B, and C are present in the cell. These activators bind to the control elements and enhance the transcription of the fantasin gene.

2) Statement 2 is false. While general transcription factors are necessary for transcription in general, the specific control elements for each gene determine the level of transcription. So, the presence of general transcription factors alone does not guarantee high levels of transcription for the fantasin and imaginin genes.

3) Statement 3 is false. The imaginin gene will not be transcribed at a high level when repressors specific for the imaginin gene are present in the cell. Repressors bind to control elements and inhibit transcription, leading to reduced levels of transcription for the imaginin gene.

Learn more about regulation of transcription initiation here:

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graphing recorded data from a chart or table would be helpful to for interpreting trends or pattern true or false? Help!!!!

Answers

True. A lot of graph can help summarized data in a fast manner. A linear graph normally shows from left to right a trend in sequential manner or compare the level of each column (trend). A Bar Chart can help interpret trend as well by showing the length of the bar between each data.

Answer:

true

Explanation:

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