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1. سهلة
Which list gives the main taxonomic ranks from broadest to most specific?
A Species, genus, family, order, class, phylum, kingdom, domain B Domain, phylum, kingdom, order, class, genus, family, species C Kingdom, domain, class, phylum, family, order, species, genus D Domain, kingdom, phylum, class, order, family, genus, species 2. سهلة
What is the main role of the cytoskeleton?
A It controls which substances enter the cell B It joins amino acids into proteins C It gives the cell its shape and helps it move D It stores the genetic code of the cell 3. سهلة
في التجربة، ما المتغير التابع؟
A العامل الذي يُقاس لمعرفة الأثر B أي عامل يُبقى ثابتًا C الفرضية قيد الاختبار D العامل الذي يغيّره الباحث عمدًا 4. متوسطة
Which statement about Archaea is correct?
A They are a type of virus B They are prokaryotes, and many live in extreme environments C They are multicellular plants D They are eukaryotes that have a nucleus and membrane-bound organelles 5. متوسطة
There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?
A Each codon codes for more than one amino acid at the same time B Only 20 of the codons are ever used C Most amino acids are coded for by more than one codon D Each amino acid has exactly three codons 6. متوسطة
A student switches a light microscope from low power to high power. What happens to the field of view?
A It gets larger but less detailed B It gets smaller and usually darker C It gets larger and brighter D It stays the same size but gets brighter 7. صعبة
لُقّح نبات AaBb مع نبات aabb. الجينان يتوزعان باستقلال. ما نسبة الأنماط الظاهرية المتوقعة في النسل؟
A 1 : 2 : 1 B 1 : 1 : 1 : 1 C 3 : 1 D 9 : 3 : 3 : 1 8. صعبة
The coding part of an mRNA is 900 bases long, including the start codon and the stop codon. How many amino acids are in the protein?
A 299 B 300 C 298 D 900
مفتاح الإجابات 1. D · Domain, kingdom, phylum, class, order, family, genus, species2. C · It gives the cell its shape and helps it move3. A · العامل الذي يُقاس لمعرفة الأثر4. B · They are prokaryotes, and many live in extreme environments5. C · Most amino acids are coded for by more than one codon6. B · It gets smaller and usually darker7. B · 1 : 1 : 1 : 18. A · 299حلول كاملة خطوة بخطوة: تدرّب على هذا الموضوع في examproblems.com.