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2972
What is the term for the regular coiling or zigzagging of a polypeptide chain through hydrogen bonding?
The secondary structure of a protein refers to the local arrangements of a polypeptide chain through hydrogen bonding, resulting in regular coiling or zigzagging patterns, such as alpha helices and beta sheets.
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2974
Electricity in voltaic cell is produced due to_________________?
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2975
In sp3 hybridization the expected geometry of molecules will be__________________?
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2976
What essential element is required for the healthy growth and development of leaves?
Calcium is a crucial element for normal leaf development, as it plays a vital role in cell wall formation and maintenance. It also helps regulate various physiological processes, ensuring proper leaf growth and function.
Aspirin is prepared by chemical synthesis from salicylic acid, through acetylation with acetic anhydride. The molecular weight of aspirin is 180.16g/mol. It is odourless, colourless to white crystals or crystalline powder.
Reforming is a process that converts low-octane petrol into high-octane petrol, improving its quality. This process involves rearranging molecular structures to produce a higher-quality fuel. While cracking and refining are also refining processes, reforming specifically targets improving petrol quality.
2979
Which temperature represents the lowest possible temperature?
Absolute zero is the theoretical lowest possible temperature, where according to the Kelvin scale, all molecular motion ceases. In the given options, -273.16°C is the temperature that corresponds to absolute zero. Note that the scale is Kelvin (-273.15°C to 273.15°C is the Celsius scale, while absolute zero is defined as 0 K on the Kelvin scale.)
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