The cell membrane consists of three classes of amphipathic lipids: phospholipids, glycolipids, and sterols. The amount of each depends upon the type of cell, but in the majority of cases phospholipids are the most abundant, often contributing for over 50% of all lipids in plasma membranes.
The charactistics that make it difficult for endangered species to rebound include;
- The habitat is significantly changed
- Over exploitation of the species
- Pollution that threatens the existence of the species
<h3>What are endangered species?</h3>
Endangered species are those species that are facing the threat of extinction sometimes owing to severe habitat loss or some other factors.
We must note that these characteristics that make it difficult for endangered species to rebound;
- The habitat is significantly changed
- Over exploitation of the species
- Pollution that threatens the existence of the species
Learn more about endangered species: brainly.com/question/12446045
Answer:
GUA and GUG.
Explanation:
If you look at the attached genetic code, the wild-type glutamic acid (Glu) is coded by the codons GAA and GAG.
Valine (Val) can be coded by the codons GUU, GUC, GUA or GUG.
Sickle-cell hemoglobin arises from a single mutation, which causes the translation of Val instead of Glu. The only codons that code for Valine that differ in just one base with the Glu codons are GUA and GUG.
