ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What does it mean that a cell membrane is selectively permeable?

1. AIt lets every substance cross freely in both directions
2. BIt lets no substance cross at all
3. CIt lets some substances cross but not others
4. DIt lets only water molecules cross

ماذا يفعل الجسيم الحال (الليسوسوم)؟

1. Aيهضم الفضلات والأجزاء البالية
2. Bيخزّن المعلومات الوراثية للخلية
3. Cيصنع البروتينات من الأحماض الأمينية
4. Dيلتقط طاقة الضوء للخلية

Which organelle breaks down fatty acids and hydrogen peroxide?

1. AChloroplast
2. BRibosome
3. CCentriole
4. DPeroxisome

Which polymer is correctly matched with its monomer?

1. AProtein and nucleotide
2. BDNA and amino acid
3. CGlycogen and fatty acid
4. DStarch and glucose

Researchers randomly assign patients to receive either a new wound dressing or the standard dressing and compare healing times. What type of study is this?

1. AAn observational study
2. BA survey
3. CA controlled experiment
4. DA case report

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy conjugation, transferring plasmids through a pilus
2. BBy mitosis, sharing copies of their chromosomes with neighbours
3. CBy meiosis, forming gametes with new alleles
4. DBy osmosis, moving genes in water

PCR starts with one double-stranded DNA molecule, and the number of copies doubles each cycle. How many copies are there after 10 cycles?

1. A1024
2. B100
3. C512
4. D20

A pesticide that is not broken down is sprayed on crops. Later, hawks at the top of the food chain have much higher levels of it than the insects. Why?

1. AEach predator eats many prey, so the pesticide builds up at each level
2. BHawks eat the crops directly, so they take in the most pesticide of all
3. CHawks make the pesticide in their own bodies
4. DThe pesticide is broken down faster in insects than in plants