ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What is a monomer?

1. AA small unit that joins with others to form a polymer
2. BA molecule that contains no carbon
3. CA very large molecule that is made of many smaller units
4. DAn enzyme that breaks down polymers

What does homozygous mean?

1. AHaving two different alleles for a gene
2. BHaving an extra chromosome
3. CHaving two identical alleles for a gene
4. DHaving only one copy of a gene

What is the single most important way to prevent the spread of infection in hospitals?

1. AOpening the windows
2. BWearing a hair net
3. CGiving every patient antibiotics
4. DHand hygiene

Where does the Krebs (citric acid) cycle take place in a eukaryotic cell?

1. AOn the rough endoplasmic reticulum
2. BIn the nucleus
3. CIn the cytoplasm
4. DIn the mitochondrial matrix

In a food chain, which organisms are the producers?

1. APlants and algae that make food by photosynthesis
2. BPredators at the top of the chain
3. CFungi that break down dead material
4. DAnimals that eat only plants, such as rabbits and deer

A bone marrow transplant can treat some blood cancers. Why does it work?

1. AThe donor marrow contains antibiotics that kill cancer
2. BThe donor red cells divide to make more red cells
3. CThe transplant replaces the patient's bones
4. DThe donor stem cells produce new, healthy blood cells

Why can a scientific hypothesis never be proven true with absolute certainty?

1. AHypotheses are only opinions and cannot be tested
2. BNew evidence could always contradict it in the future
3. CScientists are not allowed to reach any conclusions
4. DEvery experiment contains a mistake

Bacteria in a closed flask grow quickly at first, but the population then stops increasing. What is the main reason?

1. AThe bacteria change into viruses after many divisions
2. BThe flask becomes too cold for growth
3. CNutrients run out and waste products build up
4. DThe bacteria stop dividing once they reach adult size