Which of the following make membrane selectively permeable barrier that select materials according to cell’s need?
a) carbohydrates
b) lipids
c) proteins
d) all of these
Explanation: extrinsic proteins act as receptors, integral proteins function as permease, regulate diffusion, osmosis and active transport
Which of the following is/are the function of carbohydrates of membrane?
a) provide receptor sites
b) recognition of antigens
c) responsible for endocytosis
d) all of these
Substances are allowed to pass through cell membrane to maintain constant…….
a) concentration
b) temperature
c) gradient
d) pH
Which of the following is/are the cell surface marker/s?
a) carbohydrates
b) glycolipid
c) glycoprotein
d) both b and c
Explanation: Cell surface markers are proteins and carbohydrates which are attached to the cellular membrane, allowing cell surface markers to play an integral role in intercellular signaling.
What is the width of plasma membrane?
a) 1nm
b) 1-3µm
c) 7 nm
d) 10-15µm
Which of the following is/are the function/s of plasma membrane?
a) to obtain nutrients and excrete waste substances and useful substance
b) to generate the ionic gradients essential for nervous and muscular activity
c) to maintain suitable pH and ionic concentration within the cell for enzymes
d) all of these
