Biology for nursing entrance exams worksheet with answers

Why is a virus unable to reproduce on its own?

1. AIt has no genetic material of any kind, neither DNA nor RNA
2. BIt needs the machinery of a host cell to make copies
3. CIt reproduces only in sunlight
4. DIt divides only by meiosis

What is a decomposer?

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

What is cell differentiation?

1. AThe process by which cells become specialised
2. BThe process by which cells die on purpose
3. CThe process by which a cell divides into two
4. DThe process by which DNA is copied

Salivary amylase begins the digestion of which nutrient in the mouth?

1. AProtein
2. BCellulose
3. CStarch
4. DFat

Why do root hair cells have long, thin extensions?

1. ATo carry out photosynthesis underground
2. BTo anchor the plant firmly against strong winds and rain
3. CTo store starch for the winter
4. DTo increase the surface area for absorbing water

Why is water good at dissolving salts and sugars?

1. AIt has a very low boiling point
2. BIt contains carbon atoms
3. CIts molecules are nonpolar
4. DIts molecules are polar

A patient breathes very slowly, so carbon dioxide builds up in the blood. What happens to the blood pH, and why?

1. AIt falls, because CO₂ forms carbonic acid in the blood
2. BIt rises, because CO₂ is a base
3. CIt rises, because CO₂ removes hydrogen ions
4. DIt stays the same, because CO₂ does not dissolve in blood

A graph shows that an enzyme's activity rises from 20 °C to a peak at 37 °C and then falls sharply. What is the best interpretation?

1. AThe optimum is about 37 °C; hotter conditions denature it
2. BThe enzyme works best at 20 °C and is destroyed at 37 °C
3. CTemperature has no effect on enzyme activity
4. DThe enzyme keeps speeding up as the temperature rises