Answer:
The herds have been declining in recent decades due to a complicated mix of factors including hunting, disease, diminished food availability, and climate change, the report explains.
Answer:
Having kidney disease wearing protective clothing and sunscreen when outdoors
Explanation:
In principle, vitamin D deficiency is caused by reduced skin exposure to the sun, because this vitamin is synthesized with an enzyme precursor by the sun action. People who have kidney failure may also have this deficiency because its absorption is difficult for these patients.The skin of people who use excess sunscreen form less vitamin D.
Answer:
<em> e) Ala</em>
Explanation:
Alpha helix is a secondary structure of proteins, it is made of 3.6 aminoacids residues per turn, this structure is possible thanks to local hydrogen bonding between C=O and N-h groups. The result is a cylindrical structure with a hydrogen-bonded backbone and the outside studded with side chains.
Glycin has an -H in its side chain, this makes it a too flexible molecule, therefore it's unusual to find them in alpha-helical structures because their presence could cause the helix to deform. Large R-groups can also affect this stability, phenylalanine has a bulky aromatic side group, this discards it as a stabilizer. Serine has a hydrogen bond donor or acceptor as a side chain, due to the proximity to the main chain it competes with the main chain to form NH and CO bonds. Alanine is the most common amino acid in alpha-helix structures because it has a short and no charged R group (unlike arginine that even when it's short it has a charged R-group), this makes it flexible enough to keep the structure stabilized.
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