ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

في DNA، يقترن الأدينين دائمًا بأي قاعدة؟

1. Aاليوراسيل
2. Bالثايمين
3. Cالسيتوزين
4. Dالغوانين

What is endocytosis?

1. AMoving water across the membrane by osmosis
2. BTaking material into the cell by folding the membrane around it
3. CSplitting the cytoplasm after the nucleus divides
4. DReleasing material from the cell by fusing vesicles with the membrane

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. ALigase
2. BLipase
3. CAmylase
4. DHelicase

Which kind of mutation can be passed on to a person's children?

1. AA mutation in a white blood cell during infection
2. BA mutation in a skin cell caused by sunlight
3. CA mutation in a liver cell caused by alcohol
4. DA mutation in a cell that forms eggs or sperm

A thermometer gives readings of 36,1, 36,1 and 36,2 °C for a water bath that is really at 37,0 °C. How are these readings best described?

1. ABoth accurate and precise
2. BPrecise but not accurate
3. CNeither accurate nor precise
4. DAccurate but not precise

What is meant by independent assortment in meiosis?

1. AAll chromosomes from the mother go into the same gamete
2. BHomologous pairs line up randomly, so gametes get different mixes of chromosomes
3. CSister chromatids stay joined until the end of meiosis, so all gametes are identical
4. DDNA is copied separately in each chromosome

Some viruses are surrounded by a lipid envelope taken from the host cell's membrane. Why are these viruses usually inactivated easily by soap and alcohol?

1. AEnveloped viruses have no proteins at all
2. BSoap and alcohol dissolve the viral DNA directly
3. CThe envelope is made of chitin, which soap digests
4. DSoap and alcohol break up the lipid envelope

A patient breathes very slowly, so carbon dioxide builds up in the blood. What happens to the blood pH, and why?

1. AIt rises, because CO₂ is a base
2. BIt rises, because CO₂ removes hydrogen ions
3. CIt falls, because CO₂ forms carbonic acid in the blood
4. DIt stays the same, because CO₂ does not dissolve in blood