Biology for nursing entrance exams worksheet with answers

What is a gene?

1. AA complete set of all the chromosomes of a cell
2. BA protein that copies DNA before cell division
3. CA type of cell that carries hereditary traits
4. DA section of DNA that codes for a product such as a protein

What is a mutagen?

1. AA protein that repairs damaged DNA
2. BSomething that can cause changes in DNA
3. CA cell that divides without control
4. DAn enzyme that copies DNA

What is homeostasis?

1. ABreaking down food for energy
2. BMaking identical copies of a cell
3. CKeeping a stable internal environment
4. DChanging a species over many generations

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

1. ACellulose
2. BStarch
3. CFat
4. DProtein

What do starch, glycogen and cellulose have in common?

1. AThey are polysaccharides made of glucose units
2. BThey are proteins made of amino acids
3. CThey are nucleic acids that store hereditary information
4. DThey are lipids that store energy

How does facilitated diffusion differ from simple diffusion?

1. AIt only moves gases such as oxygen
2. BIt uses channel or carrier proteins but no ATP
3. CIt moves molecules against their gradient using a pump and ATP
4. DIt uses ATP to move molecules uphill

An Rh-negative mother gives birth to an Rh-positive baby. Why could a later Rh-positive pregnancy be at risk?

1. AHer red cells may become Rh positive after the birth
2. BThe first baby's antibodies remain in her blood and attack her
3. CShe may have made anti-D antibodies that cross the placenta
4. DThe second baby will be unable to make any red cells

A student gives fertiliser to 2 tomato plants and none to 2 others. The fertilised plants grow taller. What is the main weakness of the conclusion that fertiliser increases growth?

1. AThere was no independent variable
2. BHeight cannot be measured accurately
3. CThe sample size is too small to rule out chance
4. DFertiliser should have been given to all four plants