Answer: the correct option is C (birds and mammals)
Explanation: Transitional forms exhibits traits common to both an ancestral group and its derived descendant group. Transitional forms are seen in the fossil record that link all of these groups EXCEPT
birds and mammals.
Answer: treatment, prevention, and testing.
Explanation: Through treatment, the morbidity and mortality related to HIV have been greatly reduced. The most notable advance in terms of treatment is the use of combination antiretroviral therapy, but there are still many people who do not have access to these treatments.
Prevention strategies depend on the historical, cultural and infrastructure elements of each country.
One in five people at high risk of infection do not have access to counseling and voluntary testing.
Answer:
The correct answer to the question is: b) Amphipathic molecules.
Explanation:
- The membrane structures are composed of molecules having both hydrophobic and hydrophilic regions. These are called Amphipathic molecules.
- The hydrophobic region is formed of water insoluble lipid (fatty acid) molecules which tend to avoid contact with water and so remain in the interior of the membrane.
- The hydrophilic region is formed by water soluble phosphate groups which forms hydrogen bonds with the water molecules and so remain on the surface of the membrane.
- Therefore, a membrane is formed from by a phospholipid bilayer, that is, two layers of phospholipid polymer where the lipid part is directed towards the centre away from water and the phosphate part towards the surface in association with water molecules.
- A single phopholipid moiety is composed of a glycerol molecule which forms two ester bonds with a phosphate group and a fatty acid molecule.
A part of the cell that controls the biochemical processes of respiration and energy production occur.
D.) "Pepsin" <span>speeds up the breakdown of proteins in food
Hope this helps!</span>
