The disorder caused by the deficiency of the enzyme phenylalanine hydroxylase is: MCQ with Answer and Explanation

Explanation:
Hans Fischer determined the structure of chlorophyll in the 1930s and synthesized hemin. Willstätter studied its composition, Calvin elucidated the carbon fixation pathway, Woodward synthesized chlorophyll.

Explanation:
Biological Oxygen Demand (BOD) is a measure of the amount of dissolved oxygen required by aerobic microorganisms (mainly bacteria) to decompose the organic matter present in a given volume of water sample at a specific temperature over a specific time (usually 5 days at 20°C). High BOD indicates high levels of organic pollution, which depletes oxygen for aquatic life.

Explanation:
The ozone layer, which absorbs harmful UV radiation, is located in the stratosphere. Chlorofluorocarbons (CFCs) release chlorine atoms in the stratosphere that catalytically destroy ozone molecules. Global warming is primarily driven by the greenhouse effect due to excess carbon dioxide and other greenhouse gases, not oxygen. Thus, statements 1 and 2 are correct.