In the conditions of earths early atmosphere, oxygen was limited and most of the atmosphere would be filled with noxious methane, carbon monoxide, hydrogen sulfide, and ammonia.
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Answer: Saprophytic and parasitic
The fungi in general is a group of saprophytic as well as parasitic organisms that feeds upon the dead and decaying matter as well on the living organisms. These organism cannot prepare their own food by the process of photosynthesis like plants and other autotrophs but are dependent upon others organisms as well as dead matter for their food requirements.
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.
