C. The size of the tumor before because it doesn't depend on Drug X's effects or the effects/changes from the scientist.
Answer:
The answer is dominant.
Explanation:
The species in a community that is more abundant in number or biomass than any other is the <u>dominant</u> species, although not necessarily the species that has the greatest impact on the community. Dominant species, therefore, also have bigger niches and represent a big part of the competition with others.
Answer:
Antibiotic resistance can evolved in bacterial population in the following ways:
Explanation:
- In response to constant exposure to antibiotics some members of a bacterial population develop some beneficial mutations in some essential genes that gives them survival advantage in terms of food and space over the sensitive bacterial strains and hence they are capable of out-competing the sensitive bacteria.
- This happens due to the process of Natural Selection.
- These genes are called antibiotic resistance genes and bacteria usually carry them on plasmids in form of cassettes where genes resistant to multiple drugs are incorporated. These plasmids are called the MDR or Multi-Drug Resistance Plasmids.
- These resistant plasmids can be easily transferred among bacterial populations by conjugation, transformation or transduction or direct plasmid transfer.
- The resistant genes encode for proteins that render the drug ineffective by promoting their efflux from the cells, preventing their entry into the cell, chemically modifying them such that they become non-functional or altering the target site of the drug.
The answer is Nitrogen fixation
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RNA polymerase can't bind on the promoter region, so no transcription takes place, consequently, no protein translation.
