Question

the phospholipids of plasma membranes contain
a hydrophobic head and a hydrophilic tail
two hydrophobic heads and a hydrophilic tail
a hydrophobic head and two hydrophobic tails
a hydrophilic head and two hydrophobic tails
a hydrophilic head and two hydrophilic tails
question 8 (2.5 points)
which organelle is enclosed by a double membrane?
ribosome
nucleus

Explanation:

• Phospholipids: The head of a phospholipid is hydrophilic (water - loving) due to the phosphate group, and the two tails are hydrophobic (water - fearing) as they are made of fatty acids.
• Organelles: Ribosomes are non - membrane - bound organelles. The nucleus is enclosed by a double membrane called the nuclear envelope.

Answer:

For the first question: a hydrophilic head and two hydrophobic tails.
For the second question: nucleus.