Answer:e
retroviruses
Explanation:
Retroviruses appear to cause cancer in their host by mutating the host gene sequences allowing for the activation of some potentially oncogenic genes to be expressed. They do this by inserting their proviral DNA into the host genome at specific regulatory sequences deregulating cellular signaling and transcriptional controls.
Beak of birds change according to their climate and other conditions in their surroundings as the birds adapt to them.
Explanation:
The beak of the bird is the source from which it catches its prey so it is important for the survival of the bird that the beak remains effective for the use.
The competition from other species of birds may often trigger development in beaks for better suitability to the climate to become more effective than other species.
This happens through the process of adaptation as the birds adapt to their environment and then pass their genes down to their next generation through their inheritance in lineage.
Answer:
A HeLa cell is a type of immortal cell (instead of dying, cells multiply) used in scientific research. This is the oldest and most widely used human cell line. Being the first immortal cell line successfully cultivated in the laboratory.
Thus, this cell line was derived for use in cancer research. These cells proliferate abnormally quickly, even in comparison to other cancer cells. Like many other cancer cells, HeLa cells have an active version of telomerase during cell division, which prevents the incremental shortening of telomeres that implies cell aging and death. In this way, cells bypass the Hayflick boundary, which is the limited number of cell divisions, that most normal cells can become later, before submitting to senescent.
Explanation:
The intron acting in this scenario is A carbohydrate. <u>Option A.</u>
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The most important function of introns is to allow alternative splicing, allowing multiple proteins to be made from a single gene. Some introns are spliced and further processed to encode functional RNA molecules. The first stage is the genomic intron, which is the DNA sequence of the introns.
Introns are regions within a gene that do not remain in the final mature mRNA molecule after transcription of the gene and do not code for the amino acids that make up the protein encoded by that gene. Most protein-coding genes in the human genome consist of exons and introns. Introns are nucleotide sequences in DNA and RNA that do not directly code for proteins and are removed during mRNA maturation by RNA splicing during the precursor messenger RNA stage.
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