Which of the following statements correctly defines biotechnology?
-the process of cutting dna into fragments and inserting the fragments with a desired gene into another organism of the same or different species
-a field of biology that uses genetic engineering to produce crops, pharmaceuticals, and enzymes for use in industry and manufacturing processes
-the process of analyzing dna samples to identify individuals
-a field of biology in which microorganisms and their effects on other living organisms are studied

The correct answer is- a field of biology that makes the use of genetic engineering in order to produce crops, pharmaceuticals, and enzymes that are used in industry as well as manufacturing processes.

Biotechnology can be described as the manipulation of life forms or their components so as to produce useful commercial products such as crops that are resistant to pest, pharmaceuticals, useful enzymes. The manipulation is done using genetic engineering.  

As a result of new products, advancement is made in the form of increased yield of crop, medicinal breakthrough or improvement in health.          

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.