You have just discovered an organism that lives in extremely cold environments. which of the following would you predict to be true about the phospholipids in its membranes, compared to phospholipids in the membranes of organisms that live in warmer environments?
a) the membrane phospholipids of cold-adapted organisms will have longer hydrocarbon tails.
b) the membrane phospholipids of cold-adapted organisms will have more saturated hydrocarbon tails.
c) the membrane phospholipids of cold-adapted organisms will have more unsaturated hydrocarbon tails

c) The membrane phospholipids of cold-adapted organisms will have more unsaturated hydrocarbon tails

Explanation:

The cell membranes are fluid, the lipids that compose it have some movement. In cold temperatures that movement is reduced and the membrane becomes more rigid. To overcome this, organisms that live in cold environments have certain adaptations that keep the membrane fluid.

One of those adaptations is to contain more unsaturated phospholipids. Unsaturated phospholipids contain double bonds that introduce “kinks”  in the hydrocarbon tails, which interfere with the lipid's packing and reduce rigidity.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.