<h3><u>Answer;</u></h3>
A. global temperatures drop several degrees after several massive volcanic eruptions
<h3><u>Explanation;</u></h3>
- <em><u>A mass extinction refers to a widespread and a rapid decrease in the Earth's biodiversity. </u></em>
- <em><u>Mass extinctions may occur due to a number of reasons which includes, asteroid impacts, climate change, massive volcanic eruptions or a combination of all these causes. </u></em>
- <em><u>An example of mass extinction was during the Mesozoic Era, that led to the extinction of dinosaurs, about 65 million years ago.</u></em>
The correct response is,
the sequences within the promoter region at -10 and -35 are the most important for recognition by the sigma subunit.
Promoter region is the DNA sequence located upstream of the corresponding gene. Promoters for genes are essential as RNA polymerase recognizes the promoter region and binds to it forming the holoenzyme complex which can inititate transcription of the gene located downstream.
Sigma factor is the transcription factor found in bacteria, RNA polymerase has a subunit for the sigma factor, this factor only can recognise the sequences in the promoter region and bind to it thus initiating transcription.
Promoters usually have 2 parts of conserved regions, -10 element and -35 elements. Both these regions have conserved sequences.
The sigma factor is capable of identifying these conserved sequences at these particular locations of the promoter and can bind to these sequences.
once the sigma factor binds to these regions, RNA polymerase too binds and forms a transcription initiation complex and then transcription of the downstream gene is initiated.
Therefore promoters need not have identical sequences for the sigma factor to bind, as long as the -10 and -35 regions have conserved sequences the sigma factor can bind and transcription initiation will be followed.
Answer:
2. compounds: h2o, o2, c6 h12 o6, co2
Explanation:
2. compounds: h2o, o2, c6 h12 o6, co2
While awaiting surgery, a client with a long history of Crohn's disease is receiving total parenteral nutrition (TPN) on an outpatient basis. The nurse teaches the client that TPN helps to prepare for surgery by decreasing the fecal bulk.
Further Explanation:
Crohn's disease is referred to as inflammatory bowel disease. It develops inflammation inside the digestive tract and can lead to pain in abdominal pain, fatigue, severe diarrhea, malnutrition, and weight loss. Mainly inflammation in digestive tract can spread into the deep layers of bowel tissue. It can be debilitating, painful and may lead to life-threatening problems.
Total parenteral nutrition is an alternative way of administering intravenous therapy or feeding patient. TPN acts by decreasing bowel stimulation and fecal bulk. It helps in providing rest to the bowl while waiting for surgery. It doesn’t basically prevent bowel infection. Parenteral nutrition provides the necessary nutrients for the survival of the patient. In general, glucose, lipids, minerals, and amino acids are administered parenterally.
Learn more:
- Learn more about the product of photosynthesis <u>brainly.com/question/873199
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- Learn more about cellular respiration <u>brainly.com/question/8900186
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- Learn more about glucose <u>brainly.com/question/5125550
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Answer Details:
Grade: High School
Subject: Biology
Topic: Total parenteral nutrition
Keywords:
Total parenteral nutrition, glucose, lipid, amino acid, TPN, life-threatening, inflammatory bowel disease, pain, fatigue, diarrhea, weight loss, Crohn's disease.
Answer: population density
Explanation:
