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mariarad [96]
3 years ago
8

What happens to RNA polymerase II after it has completed transcription of a gene? a. It begins transcribing the next gene on the

chromosome. b. It is free to bind to another promoter and begin transcription. c. It is degraded. d. It joins with another RNA polymerase to carry out transcription.
Biology
1 answer:
Over [174]3 years ago
7 0

The correct answer is: b. It is free to bind to another promoter and begin transcription

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  

• 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.

RNA polymerase is also released and can transcribe some other gene by binding to its promotor. RNA polymerase will transcribe just the genes whose products are needed at a particular moment.

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According to most scientists, green algae are the ancestors of plants. Which statement best supports that belief? A) both have c
Tresset [83]

The statement that best supports that belief is “both have cell wall made of cellulose, store food material as starch, and have chlorophyll a and chlorophyll b”.

 

The green algae are a large, informal grouping of algae consisting of the Chlorophyte and Charophyte algae, which are now placed in separate Divisions. The land plants or Embryophytes are thought to have emerged from the Charophytes.

 

The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

8 0
3 years ago
How might the management of nonrenewable resources be different fron the management of renewable resources?
Elden [556K]

Nonrenewable resources and found it fixed amount hence not managing properly will lead to full use of it and cannot be replaced

Explanation:

  • Nonrenewable resources are found in the ground and they are the natural resources created by nature
  • It includes fossil fuels, like natural gases, oil, coal, etc and also the minerals used for making metals
  • These natural resources have taken more than human's life span to form, up to million years. Hence, replacing of these natural resources are not possible
  • Renewable natural resources are trees, water, air. These resources can be recycled and they are also circulating in the atmosphere in the form of a cycle.
  • Hence, nonrenewable resources should be managed properly for it last for the coming generations.

3 0
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Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier? D) Inducing TNF

Explanation:

The blood brain barrier is a barrier formed by brain microvascular endothelial cells, astrocytes and pericytes. Pathogens can cross this barrier by using different mechanisms. The Tumor Necrosis Factor (TNF) is the way gram-negative bacteria cross this mentioned blood-brain barrier.

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