Pinocytosis

Question 1

Bulk-phase endocytosis.

Answer 1

Pinocytosis

Question 2

Carried out by most cells of the body.

Answer 2

Pinocytosis

Question 3

Small amounts of extracellular fluid along with any dissolved solutes are taken up into the cell.

Answer 3

Pinocytosis

Question 4

Since pinocytosis transports all solutes within the extracellular fluid, it is a ___.

Answer 4

Non-specific process.

Question 5

Fill in the blanks.

First step: Droplets of extracellular fluid containing dissolved solutes collect in a __at the surface of the cell.

Answer 5

Droplets of extracellular fluid containing dissolved solutes collect in a pit at the surface of the cell.

Question 6

Fill in the blanks.

Second step: The plasma membrane ___ around these fluid droplets, forming a ___ that is drawn into the cytoplasm of the cell.

Answer 6

The plasma membrane extends around these fluid droplets, forming a vesicle that is
drawn into the cytoplasm of the cell.

Question 7

Fill in the blanks.

Third step: This fluid-filled vesicle then fuses with a ___.

Answer 7

This fluid-filled vesicle then fuses with a lysosome, which contains digestive enzymes.

Question 8

Fill in the blanks.

Fourth step: The ___ break down the extracellular fluid, and the digested
solutes are released into the ___.

Answer 8

The digestive enzymes break down the extracellular fluid, and the digested
solutes are released into the cytoplasm.

Question 9

In simple terms, enumerate the steps of pinocytosis.

Answer 9

1. Droplets collect in a pit.
2. The plasma membrane extends forming a vesicle, entering the cell.
3. After entering, the vesicle fuses with a lysosome.
4. The lysosome break down the extracellular fluid.