ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What is the main role of carbohydrates in the human diet?

1. ATo carry the body's genetic information
2. BTo provide a quick source of energy
3. CTo build muscle tissue
4. DTo form antibodies

Which protein carries oxygen in red blood cells?

1. AInsulin
2. BKeratin
3. CHaemoglobin
4. DCollagen

What is phagocytosis?

1. AA cell dividing into two identical daughter cells
2. BA cell releasing hormones by exocytosis
3. CA cell engulfing large particles such as bacteria
4. DA cell taking in small droplets of fluid

What happens to an enzyme after it has catalysed a reaction?

1. AIt is broken down into amino acids
2. BIt changes into the substrate
3. CIt becomes part of the product and leaves with it
4. DIt is released unchanged and can be used again

What happens in the Calvin cycle of photosynthesis?

1. ACO₂ is built into sugar using ATP and NADPH
2. BWater is split to release oxygen
3. CLight is absorbed by chlorophyll
4. DGlucose is broken down to release energy

A deletion removes exactly three bases, forming one whole codon, from the middle of a gene. What is the most likely result?

1. AThe protein becomes three times longer
2. BThe protein lacks one amino acid but the rest is unchanged
3. CEvery amino acid after the deletion is changed to a new one
4. DNo protein can be made at all

Finches on the Galápagos Islands have different beak shapes on islands with different foods. What is the best explanation?

1. AThe beaks changed because the birds chose to eat new food
2. BThe birds were all created with the same beak and it never changed
3. CEach bird changed its beak by using it more
4. DNatural selection favoured beaks suited to each food source

A study finds that coffee drinkers have more lung cancer. Later it is found that coffee drinkers in the study also smoked more. What is smoking in this study?

1. AThe control group
2. BA placebo
3. CA confounding variable
4. DThe dependent variable