ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

ما الغرض من المجموعة الضابطة؟

1. Aالاستغناء عن الحاجة إلى فرضية
2. Bتوفير خط أساس للمقارنة مع المجموعة المعالَجة
3. Cجعل التجربة تنتهي أسرع
4. Dتلقّي أكبر جرعة ممكنة من المعالجة قيد الاختبار

Which molecules, made by immune cells, bind to specific antigens?

1. APhospholipids
2. BEnzymes
3. CAntibodies
4. DHormones

What does the enzyme DNA ligase do?

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

Which stage of aerobic respiration produces the most ATP?

1. AThe electron transport chain
2. BFermentation
3. CThe Krebs cycle in the matrix
4. DGlycolysis in the cytoplasm

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA nonsense mutation
2. BA silent mutation
3. CA missense mutation
4. DA frameshift mutation

Where does the oxygen released by photosynthesis come from?

1. AFrom chlorophyll that is used up
2. BFrom glucose that is broken down
3. CFrom water molecules that are split
4. DFrom carbon dioxide molecules that are split

At dawn, a plant shows no overall uptake or release of oxygen or carbon dioxide. What is the best explanation?

1. AIts stomata are permanently closed at dawn
2. BIts rate of photosynthesis equals its rate of respiration
3. CIt only respires at dawn
4. DIt has stopped both photosynthesis and respiration until it is light

A mutation changes one amino acid in an enzyme. In which location is the change most likely to stop the enzyme from working?

1. AOn the outer surface, far from the active site
2. BIn a section that is removed after the protein is made
3. CIn the active site
4. DIn the gene's stop codon