Cevaplı Hemşirelik giriş sınavları için biyoloji çalışma kâğıdı

Bir DNA molekülünün şekli nedir?

1. AÇift sarmal
2. BÜçlü sarmal
3. CTek düz iplik
4. DDüz bir halka

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

1. AHelicase
2. BLigase
3. CLipase
4. DAmylase

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 form antibodies
4. DTo build muscle tissue

Which of these is part of the body's innate (non-specific) defence?

1. AAntibodies made after vaccination
2. BT cells that recognise one virus
3. CMemory B cells from an earlier infection
4. DThe skin and stomach acid

What does RNA polymerase do?

1. AIt builds an RNA strand from a DNA template
2. BIt copies the whole genome before cell division
3. CIt removes introns from pre-mRNA
4. DIt builds a protein from an mRNA template

What is the role of oxygen in aerobic respiration?

1. AIt breaks pyruvate into lactic acid
2. BIt is split to release the energy needed for glycolysis
3. CIt is built into glucose molecules
4. DIt accepts electrons at the end of the transport chain

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 stays the same, because CO₂ does not dissolve in blood
3. CIt falls, because CO₂ forms carbonic acid in the blood
4. DIt rises, because CO₂ removes hydrogen ions

One sample of an enzyme is boiled and then cooled to 37 °C. Another is kept at 4 °C and then warmed to 37 °C. Which sample will work at 37 °C?

1. AOnly the sample that was boiled
2. BOnly the sample that was kept at 4 °C
3. CNeither sample will work
4. DBoth samples will work equally well