Transcription factors are necessary for an initiation of transcription at a regulated gene but not sufficient.
Transcription is the first step of gene expression in which DNA molecule is copied (transcribed) into RNA (mRNA) by RNA polymerase. The process of transcription is divided into three phases:
1. Initiation
• RNA polymerase with transcriptional factors bind to gene promoter Transcription factors can enhance the interaction between RNA polymerase and a DNA sequence- promoter, encouraging the expression of the gene. Such transcription factors are called activators. Otherwise, when the gene expression is inhibited, factors are called repressors and they bind to sequence –operator.
• RNA polymerase unwinds DNA double helix (transcription bubble is formed)
2. Elongation
• RNA polymerases adds nucleotides complementary to DNA
3. Termination
• RNA polymerase gets to stop codon (transcribes a sequence of DNA known as a terminator)
• Formed complementary RNA strand is released from DNA-RNA complex
Answer: Competitive
Explanation: They don’t hunt each other nor benefit from each other’s existence. Therefore, it’s most likely they compete for prey and survival.
Answer:
The amount of lipids stored as an energy reserve far exceeds the energy stored as glycogen since the human body is simply not capable of storing as much glycogen compared to lipids. Lipids yield 9 kcal of energy per gram while carbohydrates and proteins yield only 4 kcal of energy per gram.
Answer:
a. hurricane > tropical depression > tropical storm
Explanation:
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Hurricanes can often live for a long period of time -- as much as two to three weeks. They may initiate as a cluster of thunderstorms over the tropical ocean waters. Once a disturbance has become a tropical depression, the amount of time it takes to achieve the next stage, tropical storm, can take as little as half a day to as much as a couple of days.
Where on find eggs of a Bot Fly sticking to the hairs of your horse's ankles. The subfamily that these eggs likely belong to are: Gasterophilinae.
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What is Gasterophilinae?</h3>
The Gasterophilinae are a subfamily of the Oestridae that comprises huge, parasitic flies; this group was previously classified as a family, but all subsequent classifications locate them squarely within the Oestridae. Many members of this subfamily spend part of their larval lives in herbivore digestive systems.
Gasterophilus intestinalis, often known as the horse bot fly, is a species of insect in the Oestridae family that may be found all over the world. The adults, which resemble bumblebees, are most active throughout the summer.
Female botflies deposit eggs on blood-sucking arthropods like mosquitoes and ticks to reproduce. When afflicted arthropods attack a person or another mammal, larvae from the eggs are released. A botfly larva burrows into subcutaneous tissue after entering the host's skin through a bite wound or a hair follicle.
Learn more about Bot Fly:
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