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問題一覧
1
What model describes the plasma membrane as a mosaic of components with fluid properties?
Fluid Mosaic Model
2
Which describes hypertonic solution?
the extracellular fluid has higher osmolarity than the fluid inside the cell; Water leaves the cell
3
Which of the following molecules can freely pass through the plasma membrane?
Water, carbon dioxide, ammonia, oxygen
4
Carrier proteins differ from channel proteins in that they:
Bind to specific substances and change shape
5
Which of the following is the component of the plasma membrane?
Proteins, carbohydrates, lipids
6
What is the main function of the plasma membrane?
Define the cell’s borders and keep it functional
7
Selective permeability refers to:
Allowing some substances to pass while blocking others
8
Diffusion occurs when substances move:
From higher to lower concentration
9
Which describes bulk transport?
Large molecules, such as proteins and polysaccharides cross the membranes in bulk through the processes of exocytosis and endocytosis.
10
Which type of endocytosis involves wrapping around the dissolved materials and forms a vesicle that contains the engulfed materials or cellular drinking?
Pinocytosis
11
Which type of endocytosis involves the cell engulfing solid particles or cellular eating?
Phagocytosis
12
What is the primary function of integral proteins?
Facilitate transport and act as receptors
13
Which factor does NOT affect diffusion rates?
Type of nucleic acid present
14
Peripheral proteins are:
Found on the exterior and interior membrane surfaces
15
Which describes hypotonic solution
the extracellular fluid has lower osmolarity than the fluid inside the cell; Water enters the cell
16
The hydrophilic head of a phospholipid interacts with:
Water and other polar molecules
17
What is the glycocalyx?
A sugar coating that attracts water to the cell surface
18
the reverse of exocytosis wherein cells engulf materials; the engulfed substance then enters the cytoplasm while enclosed in a vesicle.
Endocytosis
19
Carbohydrates on the plasma membrane are bound to:
Proteins and lipids
20
What is one key importance of active transport?
Maintains ion concentrations like Na+ and K+
21
the process of removing materials from the cell through the vesicles that fuse with the plasma membrane, releasing their contents outside the cell
Exocytosis
22
Which type of protein facilitates water transport through the membrane?
Channel protein
23
Which describes isotonic?
the extracellular fluid has the same osmolarity as the cell; No net movement of water into or out of the cell
24
Osmosis is:
The transport of water through a selectively permeable membrane
25
What causes the membrane’s fluidity?
Kinks in unsaturated fatty acids
26
Active transport requires energy because:
It moves solutes against the concentration gradient
27
Integral proteins are:
integrated completely into the membrane structure