NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called
A
facilitated diffusion.
B
endocytosis.
C
ectocytosis.
D
osmosis.
Explanation: 

Detailed explanation-1: -Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with th e cell membr ane. The membrane folds over the substance and it becomes completely enclosed by the membrane.

Detailed explanation-2: -Cells ingest fluid, molecules, and particles by endocytosis, in which localized regions of the plasma membrane invaginate and pinch off to form endocytic vesicles. Many of the endocytosed molecules and particles end up in lysosomes, where they are degraded.

Detailed explanation-3: -In phagocytosis, the cell membrane surrounds the particle and engulfs it. ( credit: Mariana Ruiz Villareal) In preparation for phagocytosis, a portion of the inward-facing surface of the plasma membrane becomes coated with a protein called clathrin, which stabilizes this section of the membrane.

Detailed explanation-4: -Active transport is the transport of molecules that require the use of energy, in the form of an energy-storing chemical called ATP (adenosine triphosphate) to help them cross the cell membrane.

Detailed explanation-5: -Endocytosis is a general term describing a process by which cells absorb external material by engulfing it with the cell membrane. Endocytosis is usually subdivided into pinocytosis and phagocytosis.

There is 1 question to complete.