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:
The white bloods cells, it takes control of the DNA.
Explanation:
The ocean life would die off because less salinity in the water and if the currents decrease in strength the nutrients they carry would not make to the life in the oceans and ocean life would die.
Answer:
Explanation:
Let's evaluate each choice. Remember we are looking for an event to <em>decrease</em> the genetic variation and population.
A. Yellowstone expanded its borders
- If the park expanded, it's likely the population would increase. There would be more space and resources for the deer.
B. A population of wolves was introduced
- A wolf is a predator that preys on deer. If they were introduced, they would use the deer as a food source and decrease the population.
B seems like a good answer, but let's check the others.
C. The amount of disease in the deer population decreased.
- This would help the deer population. Less disease means fewer deaths and a greater population.
D. More grass and shrubs were planted in Yellowstone
- Deer are herbivores, so grass and shrubs would provide more food. This would keep the deer nourished and healthy, meaning a greater population.
The best answer choice is B: A population of wolves was introduced into Yellowstone National Park