Cevaplı Hemşirelik giriş sınavları için biyoloji çalışma kâğıdı

What is a decomposer?

1. AAn animal that hunts other animals
2. BAn organism that breaks down dead material
3. CAn animal that eats only plants
4. DAn organism that makes food from sunlight

What is a monosaccharide?

1. AA single sugar unit, such as glucose
2. BTwo sugars joined together, such as sucrose
3. CA fat made of glycerol and fatty acids
4. DA chain of many amino acids

What is a bacteriophage?

1. AA bacterium that infects viruses
2. BA fungus that kills bacteria
3. CA virus that infects bacteria
4. DA white cell that eats bacteria

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

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

What is the role of ribosomal RNA (rRNA)?

1. AIt forms part of the ribosome and helps join amino acids
2. BIt brings single amino acids to the ribosome
3. CIt carries the code from DNA to the ribosome
4. DIt stores genetic information in the nucleus

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

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

Why does cooking oil not mix with water?

1. AOil molecules are polar and repel the charged ends of water molecules
2. BOil molecules are nonpolar and cannot form hydrogen bonds with water
3. COil is denser than water and sinks
4. DWater molecules are nonpolar and avoid each other

Why is one new DNA strand made in short pieces (Okazaki fragments) during replication?

1. AOnly half of the DNA needs to be copied
2. BHelicase cuts that strand into pieces before copying
3. CDNA polymerase works only 5' to 3', and the strands are antiparallel
4. DThe lagging strand is made of RNA instead of DNA, so it must be built in pieces