Biology for nursing entrance exams worksheet with answers

What is a decomposer?

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

What is a mutagen?

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

What is the main role of the cytoskeleton?

1. AIt stores the genetic code of the cell
2. BIt gives the cell its shape and helps it move
3. CIt controls which substances enter the cell
4. DIt joins amino acids into proteins

Why do plants wilt when the soil around their roots becomes very salty?

1. AWater leaves the root cells by osmosis
2. BSalt makes the root cells swell and burst
3. CThe roots take in too much water
4. DSalt blocks sunlight from reaching the leaves

What does it mean that a person's blood is Rh negative?

1. ATheir red cells lack the A and B antigens
2. BTheir plasma has no antibodies at all
3. CTheir red cells lack the RhD antigen
4. DTheir red cells carry extra RhD antigen

What do starch, glycogen and cellulose have in common?

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

In an onion root tip, 90 of 100 cells are in interphase and 10 are in mitosis. If the whole cell cycle takes 20 hours, about how long does mitosis last?

1. A2 hours
2. B10 hours
3. C18 hours
4. D0.5 hours

Why does cooking oil not mix with water?

1. AWater molecules are nonpolar and avoid each other
2. BOil is denser than water and sinks
3. COil molecules are polar and repel the charged ends of water molecules
4. DOil molecules are nonpolar and cannot form hydrogen bonds with water