Biology for nursing entrance exams worksheet with answers

What is true of a recessive allele?

1. AIts trait shows only when two copies are present
2. BIt is always harmful to the organism
3. CIt is found only on the X chromosome
4. DIts trait shows whenever one copy is present

How many millilitres are in one litre?

1. A10
2. B1000
3. C10 000
4. D100

Which of these is a lipid?

1. ADNA
2. BA triglyceride (fat)
3. CHaemoglobin
4. DGlycogen, the storage form of glucose

A red blood cell is placed in a very salty (hypertonic) solution. What happens?

1. ANothing changes because salt cannot cross
2. BSalt enters the cell and it swells
3. CWater leaves the cell and it shrinks
4. DWater enters the cell and it bursts

What happens to a protein when it is denatured?

1. AIt loses its 3D shape but keeps its amino acid sequence
2. BIt turns into a carbohydrate
3. CIt becomes more active than before
4. DIt loses some of its amino acids but keeps its folded shape

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA frameshift mutation
2. BA nonsense mutation
3. CA missense mutation
4. DA silent mutation

A leaf with green and white areas is kept in light and then tested with iodine. Only the green areas turn blue-black. What does this show?

1. ALight is not needed for photosynthesis
2. BChlorophyll is needed for photosynthesis
3. CIodine destroys chlorophyll in the leaf
4. DWhite areas store more starch than green areas

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