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Oksi-84 [34.3K]
2 years ago
13

Prior to its export from the nucleus, what modifications must be made to a mRNA molecule in eukaryotic cells?

Biology
1 answer:
mamaluj [8]2 years ago
8 0

Answer: Option A

Explanation:

Before the mRNA which has been processed from DNA is taken and transported to the ribosomes in the cytoplasm for the translation process, some modifications are made to the mRNA before transport. This includes

1. Capping: addition of 5'-5' phosphate bonds to the 5' terminus of the mRNA. Forms the cap structure that is essentials for binding to ribosomes via special proteins attached to the cap structure

2. Addition of poly(A) tail: a poly(A) addition signal (AAUAAA) is attached to the 3' terminus of the mRNA. They are important in translation initiation and degradation prevention

3. Splicing: this is likely the most remarkable processing in eukaryotes. It involves the removal of intron regions by excision from the present-mRNA and then ligating the exon regions together giving rise to the mRNA.

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Answer:

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Explanation:

In ecology, the interaction of organisms are classified into categories including population, community, ecosystem etc.

A population in ecology consists of all the members of a particular species that inhabits a particular location. Based on the wide range of examples given in the question, a herd of bison and all the hummingbirds living in my state are examples of a population because they consists of organims of same species (bison and hummingbirds) living in a particular habitat.

A community, as opposed to population consists of organims of different species that share the same location as habitat. According to the question, Frogs, insects, and birds living near a pond and Fish, eels, and lobsters living in a coral reef are examples that represents a community because they contain organims of different species found living in a common habitat.

An ecosystem is the interaction between the biotic components (living) of a community with one another and also with the abiotic components (non-living). Based on the question, The plants, animals, water, and soil of a forest and Wetland plants, animals, and marshes represents an example of ecosystem because they contain living and non-living components interacting together. The living components in the first and second examples are plants, animals while abiotic components are water, soil and marsh.

Habitat refers to the physical location where the population or community of organisms lives. In this question, the kelp forest where sea otters live and a dying tree with holes that animals live in describes habitats of organisms.

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Question 5(Multiple Choice Worth 4 points)
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Answer:

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