Cevaplı Hemşirelik giriş sınavları için biyoloji çalışma kâğıdı

What does gel electrophoresis separate?

1. ABlood into plasma and cells
2. BDNA fragments by size
3. CCells by their shape
4. DChromosomes by their colour

In an enzyme reaction, what is the substrate?

1. AThe gene that codes for the enzyme
2. BThe part of the enzyme that changes shape
3. CThe substance that the enzyme acts on
4. DThe product released at the end

What is a heterotroph?

1. AAn organism that makes its own food by photosynthesis
2. BAn organism that gets its food from other organisms
3. CAn organism that lives only in water
4. DAn organism with no cells

In a food chain, producers hold 10 000 units of energy. Roughly how much is passed on to the primary consumers?

1. AAbout 10 000 units
2. BAbout 1000 units
3. CAbout 10 units
4. DAbout 5000 units

Why does PCR use a DNA polymerase taken from bacteria that live in hot springs?

1. AIt copies RNA as well as DNA
2. BIt works only in the dark, like the bacteria it comes from
3. CIt makes the DNA strands stick together
4. DIt survives the high temperatures used to separate the strands

In which part of the chloroplast do the light-dependent reactions happen?

1. AIn the stroma
2. BIn the cell wall
3. CIn the thylakoid membranes
4. DIn the outer membrane

Liver cells take in cholesterol-carrying LDL particles only after the particles bind to specific proteins on the cell surface. Which process is this?

1. AReceptor-mediated endocytosis
2. BPinocytosis of extracellular fluid
3. CExocytosis
4. DSimple diffusion

Bir grafik, bir enzimin aktivitesinin 20 °C'den 37 °C'deki bir tepe noktasına kadar arttığını, sonra keskin biçimde düştüğünü gösteriyor. En iyi yorum hangisidir?

1. ASıcaklığın enzim aktivitesi üzerinde etkisi yoktur
2. BEnzim sıcaklık arttıkça hızlanmaya devam eder
3. CEnzim en iyi 20 °C'de çalışır ve 37 °C'de yok edilir
4. DOptimum yaklaşık 37 °C'dir; daha sıcak koşullar enzimi denatüre eder