Biology for nursing entrance exams worksheet with answers

What is a model in science?

1. AAn exact copy that has no limitations
2. BA simplified representation of a real system
3. CThe control group of a study
4. DA single measurement from an experiment

What does mitosis produce?

1. ATwo genetically identical daughter cells
2. BFour genetically different daughter cells
3. CTwo cells with half the chromosome number
4. DOne cell with twice the chromosome number

Which elements make up carbohydrates?

1. ACarbon, hydrogen and nitrogen
2. BHydrogen, oxygen and phosphorus
3. CCarbon, nitrogen and sulfur
4. DCarbon, hydrogen and oxygen

What happens in a dehydration synthesis reaction?

1. AWater is removed from the cell by osmosis
2. BA polymer is split by adding a water molecule
3. CTwo monomers join and a water molecule is released
4. DA cell dries out and dies

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

1. ASalt makes the root cells swell and burst
2. BWater leaves the root cells by osmosis
3. CSalt blocks sunlight from reaching the leaves
4. DThe roots take in too much water

HIV is a retrovirus. What does its enzyme reverse transcriptase do?

1. AIt makes RNA from the host's DNA
2. BIt makes DNA from the virus's RNA
3. CIt breaks down the host's ribosomes
4. DIt makes proteins from the virus's DNA

Why are modified viruses often used to deliver genes in gene therapy?

1. AViruses produce antibodies that fix faulty genes
2. BViruses can reproduce without a host cell
3. CViruses are larger than human cells, so they can carry many genes
4. DViruses naturally insert their genetic material into host cells

A breastfed baby receives antibodies from its mother's milk. Why does this protection last only a short time?

1. AThe baby did not make these antibodies and forms no memory cells
2. BThe baby's stomach makes the antibodies more active
3. CThe antibodies turn into memory cells after a few weeks
4. DThe antibodies from breast milk attack the baby's own red blood cells