Question

Which steroid is found in animal cell membranes and is used to form sex hormones?
* 2 points
Oleic acid
Sphingomyelin
Cholesterol
Insulin
How are phospholipids arranged in a cell membrane bilayer?
* 2 points
The hydrophobic tails point toward the inside, and the hydrophilic heads point toward the outside
The hydrophilic heads point toward the inside, and the hydrophobic tails point toward the outside
Both tails and heads point toward the outside

Answer 1

1) Cholesterol — it’s the steroid in animal membranes and is a precursor for sex hormones.

2) The hydrophobic tails point toward the inside, and the hydrophilic heads point toward the outside — tails face each other away from water, heads face the aqueous environments.