<span> Negative staining method is used to view viruses, bacteria, bacterial flagella, biological membrane structures, lipid aggregates and proteins or protein aggregates, which all have a low electron-scattering power. This method is used to view cells or certain organelles of cells more clearly under the microscope in the field of microbiology. </span>
D:viruses are not killed by antibiotics.
A food which has been grown without the use of some but not all synthetic pesticides, synthetic fertilizers, or bio engineering could be labeled--- True
What are organic foods ?
-Organic food is produced without using most conventional pesticides, fertilizers made with synthetic ingredients, antibiotics, or growth hormones
When a food is labeled as organic this means that no pesticides have been used in its production?
Produce can be called organic if it's certified to have grown on soil that had no prohibited substances applied for three years prior to harvest. Prohibited substances include most synthetic fertilizers and pesticides.
Are organic food safer?
According to USDA data, organic foods have fewer pesticide residues than conventionally grown produce. But the amounts for both types of produce are within the level for safe consumption.
What is the meaning of organic farming?
organic farming, agricultural system that uses ecologically based pest controls and biological fertilizers derived largely from animal and plant wastes and nitrogen-fixing cover crops.
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<span>A: The proportions of a population that are at different age levels make up the population’s age structure. </span>
