1) Enumerate functions of plasma membrane.
2) Name the following:
a) Smallest cell organelle
b) Largest cell organelle
c) ER studded with ribosome
d) Functional segment of the DNA molecule.
Answers
Answer:
The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
a)The smallest organelle in a cell is the ribosome
b)The largest organelle in a cell is thenucleus;
c)The surface of the rough endoplasmic reticulum is studded with protein-manufacturing ribosomes giving it a "rough" appearance
d)The functional segment of DNA is called Gene.
The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
2)
a) Ribosomes
b) Nucleus
c) The surface of the rough endoplasmic reticulum (often abbreviated RER or rough ER; also called granular endoplasmic reticulum) is studded with protein-manufacturing ribosomes giving it a "rough" appearance (hence its name).
d) DNA molecules contain the information necessary for constructing and organizing the cells. Functional segments of DNA are called as genes.
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