Question

Question:
The macromolecules depicted in the image below make up a wall that surrounds the
outside of all cells. What type of macromolecule is pictured below?
a. Triglycerides
b. Nucleic Acids
C. Steroids
d. Phospholipids​

Answer 1

Answer:

A

Explanation:

There was no picture but the cell membrane does surround the cell and it is a phospholipid bilayer made of triglycerides so it is answer choice A

Answer 2

Phospholipids disposed in a lipidic bilayer compose the cell membrane. Their hydrophilic heads are facing the exterior, and hydrophobic tails facing the interior. The answer is d. Phospholipids.

MEMBRANE COMPOSITION

The cell membrane is composed of two lipidic bilayers, cholesterol, proteins, and glucans incrusted in between.

⇒ Lipids

• Phospholipids are amphipathic molecules.

• They have hydrophilic heads facing the exterior and the interior of the cells and hydrophobic tails that arrange against each other in the interlayer space.

• Lipids can easily change places with other lipids by lateral diffusion in the same layer.

• They can diffuse transversally to the other layer but not as easily as lateral diffusion.

• There are also other lipidic movements as rotational diffusion that imply the rotation of the molecule.

⇒ Cholesterol

These molecules are incrusted in the membrane between the hydrophobic tails of lipids.

⇒ Proteins

Among the proteins, we can find integral proteins and peripheric proteins.

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