Biology for nursing entrance exams worksheet with answers

Which protein gives strength to skin, tendons and bone?

1. AAmylase
2. BMyosin
3. CCollagen
4. DHaemoglobin

According to the cell theory, where do new cells come from?

1. AFrom minerals in food
2. BFrom viruses that enter the body
3. CFrom non-living matter in the body
4. DFrom cells that already exist

What is a stem cell?

1. AA cell that carries oxygen in the blood
2. BAn unspecialised cell that can divide and become other cell types
3. CA plant cell found only in the stem
4. DA fully specialised cell that can no longer divide or change its type

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

1. AThe skin and stomach acid
2. BAntibodies made after vaccination
3. CT cells that recognise one virus
4. DMemory B cells from an earlier infection

In a eukaryotic cell, where does transcription take place?

1. AIn the nucleus
2. BIn the Golgi apparatus
3. CIn the lysosomes
4. DOn ribosomes in the cytoplasm

A deletion removes exactly three bases, forming one whole codon, from the middle of a gene. What is the most likely result?

1. AThe protein becomes three times longer
2. BNo protein can be made at all
3. CEvery amino acid after the deletion is changed to a new one
4. DThe protein lacks one amino acid but the rest is unchanged

In snapdragons, flower colour shows incomplete dominance: RR is red, RW is pink and WW is white. Two pink plants are crossed. What phenotype ratio is expected?

1. A3 red : 1 white
2. B1 red : 1 white
3. CAll pink, like the parents
4. D1 red : 2 pink : 1 white

The rate of an enzyme reaction rises as substrate is added but then levels off, even when more substrate is added. Why?

1. AThe products have turned back into substrate
2. BAll the active sites are occupied
3. CThe enzyme has been denatured
4. DThe substrate has become an inhibitor