ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

In which stage of the cell cycle does a cell spend most of its time?

1. AAnaphase
2. BMetaphase
3. CInterphase
4. DProphase

What does gel electrophoresis separate?

1. ADNA fragments by size
2. BBlood into plasma and cells
3. CCells by their shape
4. DChromosomes by their colour

ما الجين؟

1. Aمقطع من DNA يشفّر لناتج مثل البروتين
2. Bبروتين ينسخ DNA قبل انقسام الخلية
3. Cالمجموعة الكاملة لكل صبغيات الخلية
4. Dنوع من الخلايا يحمل الصفات الوراثية

Many vitamins act as coenzymes. What does this mean?

1. AThey help enzymes carry out their reactions
2. BThey replace enzymes that have been denatured
3. CThey are built into the cell membrane
4. DThey are digested to release large amounts of energy

ما الذي يحدد شكل البروتين ووظيفته؟

1. Aتتابع أحماضه الأمينية
2. Bترتيب الأحماض الدهنية في الغشاء
3. Cعدد مجموعات الفوسفات التي يحملها
4. Dكمية الغلوكوز في الخلية

Why can an electron microscope show more detail than a light microscope?

1. AElectron microscopes use living cells only
2. BElectrons have a much shorter wavelength than light
3. CElectrons are brighter than light
4. DElectron microscopes use stronger glass lenses

A scientist wants to show that a particular microbe causes a disease. According to Koch's postulates, which step is needed?

1. AThe disease must be treated successfully with antibiotics
2. BThe microbe must be found in healthy hosts just as often as in sick hosts
3. CThe microbe must be seen in the blood under a light microscope
4. DThe microbe grown from a sick host must cause the disease in a healthy host

In the Hershey–Chase experiment, viruses were labelled with radioactive phosphorus in their DNA or radioactive sulfur in their protein. Only the phosphorus entered the infected bacteria. What did this show?

1. AViruses contain no DNA at all
2. BDNA, not protein, is the genetic material of the virus
3. CBacteria take up any radioactive substance
4. DProtein, not DNA, is the genetic material of the virus