A plasma membrane, also known as plasmalemma, is the structure that delimits all cells, whether of organisms prokaryotes or eukaryotes.
In addition to delimiting, the plasmatic membrane protects the cell of the extracellular environment and controls the entry and exit of substances due to its ability to selective permeability.
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We prepared a list of exerciseson plasma membrane so you can test your knowledge.
You can consult the template at the end of this publication, as well as save the list of exercises in PDF!
1) (PUC – RJ) Regarding cell envelopes, we can state that:
a) All living cells have a cell wall.
b) Only plant cells have a cell membrane.
c) only animal cells have a cell wall.
d) All living cells have a cell membrane.
e) Fungi and bacteria do not have a cell wall.
2) The plasma membrane is a relatively thin covering that surrounds the cell. According to the fluid mosaic model, this structure consists of:
a) a protein double layer in which lipids are embedded.
b) a protein layer where carbohydrates are embedded.
c) a double layer of phospholipids in which proteins are embedded.
d) a layer of phospholipids in which carbohydrates are embedded.
e) a double layer of carbohydrates in which lipids are embedded.
3) (Mackenzie) Mark the correct alternative regarding the lipoprotein membrane.
a) In bacteria, it has a different organization than that found in eukaryotic cells.
b) It exists only as the outer covering of cells.
c) It is formed by a double layer of glycoproteins, with several encrusted lipid molecules.
d) It is rigid, ensuring the stability of the cell.
e) It is involved in processes such as phagocytosis and pinocytosis.
4) Mark the alternative that best completes the following sentence:
“The plasma membrane consists of a ________ bilayer with ________ molecules embedded in it”.
a) proteins and glycocalyx
b) phospholipids and proteins
c) phospholipids and lipids
d) lipids and phospholipids
e) proteins and phospholipids
5) (UDESC) Some solid particles can be actively and passively transported across the plasma membrane. In this regard, mark the correct alternative:
a) It will be passive, when the solute is transported by osmosis, in favor of a concentration gradient.
b) It will be passive, when its transport is carried out by pumps, with energy expenditure.
c) Its transport will always be active by facilitated diffusion, with energy expenditure.
d) It will be active, when the solute is transported against a concentration gradient and with expenditure of energy.
e) It will always be passive, by pinocytosis, without expenditure of energy.
6) (UFRGS) The plasmatic membrane is a structure that acts as the external boundary of the cell, allowing it to carry out its functions. Regarding the plasma membrane, consider the statements below.
i. Its molecular structure has lipids and proteins as basic components.
II. Phospholipids have a hydrophilic region that faces the non-aqueous environment.
III. The steroid cholesterol is a lipid present in the plasma membrane of animal and plant cells.
Which ones are correct?
a) I only.
b) II only.
c) Only I and III.
d) Only II and III.
e) I, II and III.
7) In 1972, a model was proposed by Singer and Nicolson to explain the structure of the plasmatic membrane. This model was known for:
a) Model of the lipid bilayer.
b) Fluid mosaic model.
c) Lipid mosaic model.
d) Singer & Nicolson model.
e) Singer membrane model.
8) (PUC-PR) In the early 1970s, two scientists (Singer and Nicholson) clarified definitively the structure of cell membranes, proposing the so-called fluid mosaic model. In this concept, all membranes present in animal and plant cells are basically constituted by the following components:
a) Nucleic acids and proteins.
b) Nucleic acids and enzymes.
c) Lipids and enzymes.
d) Enzymes and carbohydrates.
e) Lipids and proteins.
9) (UFLA) Molecules labeled with a fluorescent compound are microinjected into an epithelial cell. Ten minutes after injection, the presence of these labeled molecules is detected in adjacent non-injected cells. This observation constitutes evidence that these cells are held together by:
a) desmosomes.
b) adhesion zones.
c) interdigitations.
d) microvilli.
e) “gap” joints.
10) (UERJ) The different types of transplants represent a great advance in medicine. However, compatibility between donor and recipient does not always occur, resulting in rejection of the transplanted organ. The component of the plasma membrane involved in the rejection process is:
a) cholesterol.
b) phospholipid.
c) cytoskeleton.
d) glycoprotein.
1 — d
2 — c
3 — and
4 — b
5 — d
6 — the
7 — b
8 — and
9 and
10 — d
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