Which type of molecule can easily pass through the cell membrane without assistance?
Large, polar molecules
Ions
Small, nonpolar molecules
Proteins
Related Questions
Which of the following is the primary component of the cell membrane?
Carbohydrates
Proteins
Nucleic acids
Phospholipids
The thickness of unit membrane is
20Å
35Å
55Å
75Å
Which of the following organelles does not contain RNA?
Chromosome
Plasmalemma
Nucleolus
Ribosome
Which type of molecule can easily pass through the cell membrane without assistance?
Large, polar molecules
Ions
Small, nonpolar molecules
Proteins
The fluidity of the cell membrane is influenced by several factors. Which of the following would DECREASE membrane fluidity?
Increased proportion of unsaturated fatty acids
Shorter fatty acid chain length
Increased cholesterol content at high temperatures
Decreased cholesterol content at low temperatures
Which of the following is characteristic of phospholipids of plasma membrane?
One non-polar head and two polar tails
One polar head and two non-polar tails
Two non-polar heads and one polar tail
Two polar heads and one non-polar tail
According to widely accepted ‘fluid mosaic model’ cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statement is incorrect?
Proteins in cell membranes can travel within the lipid bilayer
Proteins can remain confined within certain domains of the membrane
Proteins can also undergo flip-flip movements in the lipid bilayer
Many proteins remain completely embedded within the lipid bilayer
Choose the correct statements
I. Passive cells are larger in size
II. Larger cells have lower surface volume ratio
III. To remain active, larger cells are either cylindrical in shape or possess several extensions of the cell membrane, like microvilli
IV. Microvilli are found in all those cells, which are active in absorption
V. Microvilli (membrane infoldings) occurs in transfer cells found in plants in the region of absorption or secretion of nutrients
Option containing all correct statements is
I and IV
I, II, III and IV
I, III and II
I, II, III, IV and V
In eubacteria, a celluler component that resembles eukaryotic cells is
Ribosomes
Cell wall
Nucleoid
Plasmids
Cell membrane controls
Exocytosis
Endocytosis
Both (a) and (b)
Not controls movement of substance
