يوفر الغذاء للعضوية المواد الضرورية لبنائها و نموها كما يوفر لها الطاقة الضرورية لمختلف التفاعلات البيوكيميائية الجزء الاول:
لدراسة التحولات الطاقوية تحضن مزرعتان من فطر الخميرة في شروط تجريبيّة ملائمة لبضعة ايام في وسطين مختلفين يحتويان على نفس الكمية من الماء الغلوكوز و فطر الخميرة تمثل الوثيقة 1 الملاحظة المجهرية للمزرعتين في بداية التجربة و نهايتها
1- حدد المشكلة العلمية المطروحة
2- اقترح فرضية تفسيرية لنمو فطر الخميرة في الوسطين الهوائي و اللاهوائي
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One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

To store strawberries in sugar syrup, lucy placed them in a jar and covered them with sugar but did not add any water. do you think syrup will be formed? justify. a. no. since water is not added, there cannot be any syrup formation. b. no. the higher concentration of sugar on the outside will cause the water from the sugar to diffuse in the strawberry cells causing them to swell without formation of any syrup. c. yes. the higher concentration of sugar on the outside will cause the water from the strawberry to diffuse out resulting in syrup formation. d. yes. the sugar will melt over time and form the syrup.