Phospholipids Are Made by Integral ER Membrane Enzymes Whose Active

question 85

Multiple Choice

Phospholipids are made by integral ER membrane enzymes whose active sites face the cytosol and they are inserted into the outer (cytoplasmic) leaflet of the ER membrane.How then do lipids destined for the luminal leaflet of the ER membrane get there?

• A)They diffuse freely into the luminal leaflet.
• B)There are enzymes called flippases that flip these lipids later into the opposite leaflet.
• C)They are disassembled on the cytoplasmic side and reassembled on the luminal side.
• D)They move to the cytoplasmic leaflet by osmosis.
• E)There are enzymes called translocases that flip these lipids later into the opposite leaflet.

---

Definitions:

Cash Receipts

The collection of money, typically currency or checks, received by a business for goods or services.

Sales Forecast

An estimate of the expected sales of a product or service over a specific period, based on market research and historical sales data.