ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What does the enzyme DNA ligase do?

1. AIt unwinds the DNA double helix
2. BIt makes RNA from a DNA template
3. CIt cuts DNA at specific sites
4. DIt joins pieces of DNA together

What is an inference?

1. AA conclusion reached from observations and prior knowledge
2. BA list of the materials used in an experiment
3. CA variable that the scientist changes on purpose
4. DA measurement taken with a calibrated instrument in a laboratory

What does the polymerase chain reaction (PCR) do?

1. AIt turns RNA into protein
2. BIt makes many copies of a piece of DNA
3. CIt separates proteins by their charge
4. DIt cuts DNA at specific sequences

أي رابطة تربط الأحماض الأمينية معًا في البروتين؟

1. Aالرابطة الهيدروجينية بين القواعد
2. Bالرابطة الإسترية
3. Cالرابطة الببتيدية
4. Dالرابطة الغليكوسيدية

What does the enzyme lipase break down?

1. ADNA into nucleotides
2. BProteins into amino acids and peptides
3. CStarch into sugars
4. DFats into fatty acids and glycerol

ما الذي يعطي الشبكة الإندوبلازمية الخشنة مظهرها "الخشن"؟

1. Aالبلاستيدات الخضراء داخل أغشيتها
2. Bالريبوسومات المرتبطة بسطحها
3. Cالجسيمات الحالّة المندمجة بجانبها الخارجي
4. Dالقطيرات الدهنية المخزَّنة على سطحها

Cystic fibrosis is caused by a faulty CFTR protein, which forms a chloride channel in the cell membrane. Which process is directly affected?

1. AMovement of chloride ions through a membrane protein
2. BCopying of DNA in the nucleus
3. CProduction of ATP in the mitochondria
4. DDiffusion of oxygen molecules through the lipid bilayer

The field of view of a microscope is 0,5 mm wide. About 10 cells fit across it in a line. What is the approximate width of one cell?

1. A50 µm
2. B0,5 µm
3. C5 µm
4. D500 µm