Answer: Point mutation is easily reversible, thus non-lethal
Explanation:
Point mutation is caused by exchange of a single nucleotide for another. These change is called
1) Transition (when a purine base substitute another purine base, or pyrimidine bases substitute each other)
2) Transversion (when a purine base substitute a pyrimidine base).
However, note that a point mutation can be easily reversed by another point mutation; so, the claim that a nucleotide difference in the Hsr12 gene caused the human disease is inaccurate
Answer: Option C) Determining the link between genes and the traits they influence.
Explanation:
First, the field of molecular biology seeks to understand the relationship between genes and proteins. Now, since genes are specific sequences on the DNA that codes for functional proteins, and these proteins make up the various traits physically expressed in living organisms such as skin color, blood group etc.
Then, the specific research goal of Carlita would be determining how genes control the expression of individual traits at the molecular level
Explanation:
Proteins
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Answer:
(3) could be mistaken for food by some species, working their way up the food chain
Explanation:
Microbeads, such as other microplastics, can affect wildlife in many ways, but mostly by
- Ingestion
- Introduction and transference in the trophic web
- Interaction with other contaminants
- Microinvertebrates, bacteria, and viruses colonize these microplastics and can be transported long distances.
Organisms like mollusks, crustaceans, fishes, birds, turtles, among many others, might confuse these elements with food and eat them. Microbeads might float or accumulate in sediments and be ingested by different benthonic species. The ingestion of microbeads by inferior links in the trophic web means a direct entrance in the trophic web where many superior links are affected too while feeding with already contaminated prey.
The ingestion of microbeads can cause a significant impact on the growth, development, and reproduction of freshwater and seawater species.
Microbeads, like other microplastics, characterize for their durability in time and resistance, which means that the ones that are already in the oceans and rivers will last there for centuries.
