B. Crops are modified genetically as well
An annular solar eclipse happens when the Moon covers the Sun's center, leaving the Sun's visible outer edges to form a “ring of fire” or annulus around the Moon. The ring of fire marks the maximum stage of an annular solar eclipse<span>.
</span><span>https://www.timeanddate.com/eclipse/annular-solar-eclipse.html
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A cultivated field with organic methods would expect to see greater diversity.
What Is Organic Farming?
Organic farming is an agricultural practice that makes use of biological pesticides and fertilizers derived from plant or animal waste. Actually, the practice of organic farming began as a response to the harm that synthetic fertilizers and chemical pesticides were causing to the environment. Or to put it another way, organic farming is a new type of agriculture or farming that improves, maintains, and repairs the ecological equilibrium.
Economical benefits of organic farming include: For the planting of crops, expensive fertilizers, insecticides, or HYV seeds are not necessary in organic farming. There is therefore no additional cost.
Learn more about Organic Farming here:
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Answer:
*Thymidine
*THF to DHF
*THF
Explanation:
Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synthase survive and grow. The mutant cells grow because the medium contains the_____Thymidine______ they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to__THF to DHF______ . The methotrexate inhibits , so cannot be regenerated. Without a supply of______THF_____ for the synthesis of nucleotides and amino acids, the cells die.
NOTE:
THF means Tetrahydrofolate
DHF means Dihydrofolate
Thymidine which is also reffered to as deoxythymidine, is described as a deoxynucleoside that is composed of the pyrimidine base thymine that is attached to the sugar deoxyribose. Thymidine is a nucleoside made up of pentose sugar, pyrimidine base tymine and deoxyribose, it is one of the the four nucleoside found in exclusively DNA as well as T-loop of tRNA.
Tetrahydrofolate also known as tetrahydrofolic acid can be described as part of folic acid that function as a coenzyme which aid metabolic reactions that includes nucleic acid and amino acids. It is also reffered to as one-carbon metabolism, and it's oone-carbon mechanism is associated to the histidine, serine of amino acid.
23 pairs which equals 46 chromosomes in total.