You have a cellulose sack that is impermeable (i.e. NOT permeable) to starch molecules and is filled with a solution, comprised of 20% starch. It is placed in a container of 100% distilled water. a) What term describes the solution in the sack compared to the solution surrounding it? i) HYPERTONIC ii) HYPOTONIC iii) ISOTONIC b) In which direction will the water molecules move faster? i) INTO THE CELL ii) OUT OF THE CELL iii) SAME IN BOTH iv) NOT AT ALL c) In which direction will the starch molecules move? i) INTO THE CELL ii) OUT OF THE CELL iii) SAME IN BOTH iv) NOT AT ALL
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
You have a cellulose sack that is impermeable (i.e. NOT permeable) to starch molecules and is filled with a solution, comprised of 20% starch. It is placed in a container of 100% distilled water.
a) What term describes the solution in the sack compared to the solution surrounding it?
i) HYPERTONIC
ii) HYPOTONIC
iii) ISOTONIC
b) In which direction will the water molecules move faster?
i) INTO THE CELL
ii) OUT OF THE CELL
iii) SAME IN BOTH
iv) NOT AT ALL
c) In which direction will the starch molecules move?
i) INTO THE CELL
ii) OUT OF THE CELL
iii) SAME IN BOTH
iv) NOT AT ALL
The ability of a solution to change the water content of cells and modify the cell volume is called tonicity. The cells can be hypertonic, hypotonic, or isotonic. Depending on the concentration, the movement of water can be predicted. This water movement causes cells to either swell or shrink, depending on the osmotic difference between the environment and the intracellular compartments.
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