LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The atoms within a molecule of water are held together by hydrogen bonds.
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Water has a low heat capacity allowing enzymatic reactions to happen at a wide range of temperatures.
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Water molecules are polar, therefore fatty acids do not dissolve.
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Ice has a higher density than liquid water, therefore some organisms can live under the ice.
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Detailed explanation-1: -The given statement is False. Water is a polar molecule, and all living things are made up of atoms and molecules. Their molecular structure determines the solubility of the molecules. The fatty molecules such as fat and wax are not dissolved in water.
Detailed explanation-2: -Answer and Explanation: The only true statement is: c. Water dissolves polar and ionic substances.
Detailed explanation-3: -Fats are insoluble in water because they are hydrophobic and do not have any polar bonds. Water is a polar molecule, meaning that the oxygen atom has a partial negative charge and the hydrogen atoms have partial positive charges. These charges want to interact with other polar or charged molecules.
Detailed explanation-4: -Because of their polarity, water molecules are strongly attracted to one another, which gives water a high surface tension. The molecules at the surface of the water “stick together” to form a type of ‘skin’ on the water, strong enough to support very light objects.