Answer:
Letter E - exons are cut from the strand and removed
Explanation:
Letter A and B are incorrect because the poly-A tail and guanine cap are added to the 3’ and 5’ end respectively. They aid in translation of the mRNA, while serving as protection. The poly-A tail is repeated adenine nucleotides, while the guanine cap is a modified guanine nucleotide.
Letter C is incorrect because alternative splicing is one mechanism for generating variation, and is thought to be one of the reasons for why humans have smaller genomes than other organisms and still maintain high complexity. Alternative splicing is incredibly important because it produces more than one transcript from a pre-mRNA.
Letter D is incorrect because introns are the non coding portions of the mRNA. They are excised to make a smaller mRNA transcript, and one that contains all the protein genes.
This letter E is the correct answer, because exons are the coding portions of the mRNA, and are not excised during RNA processing.
Hope that helped! If I made a mistake, please let me know.
Answer:
Earth's climate had remained relatively constant.
Explanation:
- Scientists have established that human-based activities have affected and are affecting a rapid change in the earth's climate as they have brought about massive changes in the global carbon cycles and affected the ecological systems.
- Earth is has an ever-changing climate and the variation in the orbit of earth results in natural changes such as seasons, which depend on the duration and intensity of the sunlight.
Protein and Ribonucleic acids.
Answer:
Plants, animals and other organisms that live in deserts have evolved to survive harsh conditions, scarce water and barren landscapes. ... This desertification is exacerbated by human exploitation of ecosystems that border deserts, causing land degradation, soil erosion and sterility, and a loss of biodiversity.Explanation:
<span>I think that inhalants are a delivery method and not necessarily a drug type. The other three listed are actual drug types and are used in physical and mental health prescriptions. Inhalants are typically non-prescription/illegal drugs.</span>