Which of the following statements is true?
(a) phospholipids will spontaneously form liposomes in nonpolar solvents.
(b) in eukaryotes, all membrane-enclosed organelles are surrounded by one lipid
bilayer.
(c) membrane lipids diffuse within the plane of the membrane.
(d) membrane lipids frequently flip-flop between one monolayer and the other.

The correct answer is: C) Membrane lipids diffuse within the plane of the membrane.

Explanation:

Membranes are mostly made from phospholipids that, in aqueous environments, are arranged forming two layers (the hydrophilic heads are in contact to both the intercellular and extracellular spaces, and the hydrophobic tails make contact to one another in amidst the layers). These lipids that make up the bilayer diffuse laterally within the plane of the membrane and thus constitute the fluid mosaic model of cell membranes.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.