HORTICULTURE SCIENCE
PLANT BIOTECHNOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It doesn’t contain amylases to hydrolyze starch
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Starch is not a suitable substrate for the production of ethanol
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It is converted to pentose sugar
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None of the above
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Detailed explanation-1: -Answer. Answer: Because it doesn’t contain amylases to hydrolyze starch.
Detailed explanation-2: -The first step is saccharification, where starch is converted into sugar using an amylolytic microorganism or enzymes such as glucoamylase and -amylase. The second step is fermentation, where sugar is converted into ethanol using Saccharomyces cerevisiae (9, 12).
Detailed explanation-3: -Three types of substrates are used for ethanol production: (a) Starch containing substrate (b) Juice from sugarcane or molasses or sugar beet, (c) Waste products from wood or processed wood.
Detailed explanation-4: -Most ethanol in the United States is produced from starch-based crops by dry-or wet-mill processing. Nearly 90% of ethanol plants are dry mills due to lower capital costs. Dry-milling is a process that grinds corn into flour and ferments it into ethanol with co-products of distillers grains and carbon dioxide.