Answer:
naturalistic observation
Explanation:
The best possible way to study how tigers interact with each other in their habitats would be to use a naturalistic observation. This type of observation focuses on observing the main subject of the study in it's natural environment without interfering in any sort of way. This allows the scientists to observe exactly how the tigers interact when there are no humans around.
Answer:
All plasmids we manufactured are free of animal-derived materials and can contain low levels of endotoxin (<100EU/mg, on request). This process is designed to meet our customers’ diverse downstream applications such as transfection, antibody preparation, vaccine, and gene-therapy research, etc.
The question is incomplete as it does not have the options which are:
A. carbohydrate molecules
B. hydrophilic molecules
C. amphipathic molecules
D. hydrophobic molecules
Answer:
C. amphipathic molecules
Explanation:
Amphipathic molecules are the molecule which posses molecular arrangement in a way that they possess both the water-loving species and water-repelling species.
The amphipathic molecule is best for the formation of cell membranes like the lipid molecules which is comprised of both hydrophobic tail and a hydrophilic head.
Since the evidence shows that the first cell was formed in the aqueous bodies especially in the oceans by the aggregation of a molecule, therefore, the molecules for membrane must be arranged in a way that it could interact with the surrounding environment as well as protect from the environment and the result was the amphipathic molecules.
Thus, amphipathic molecules is correct.