उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

Which kind of organism causes malaria?

1. AA bacterium carried in water
2. BA protist carried by mosquitoes
3. CA fungus that grows on skin
4. DA virus spread by coughing

What is cytokinesis?

1. AThe pairing of homologous chromosomes
2. BThe condensing of chromosomes in prophase
3. CThe copying of DNA before division
4. DThe division of the cytoplasm into two cells

What is a pathogen?

1. AA cell of the immune system that fights infection
2. BA medicine that kills bacteria
3. CA harmless microbe living on the skin
4. DA microorganism or agent that causes disease

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy conjugation, transferring plasmids through a pilus
2. BBy meiosis, forming gametes with new alleles
3. CBy mitosis, sharing copies of their chromosomes with neighbours
4. DBy osmosis, moving genes in water

Why does each type of virus infect only certain kinds of cells?

1. AIt must attach to specific receptor proteins on the cell surface
2. BIt must find cells with the same DNA as its own
3. CIt can only enter cells that have no nucleus
4. DIt can only enter cells that are dividing by meiosis at that time

Which is an example of negative feedback?

1. ASweating when body temperature rises
2. BBlood clotting speeding up once it starts
3. CA wound becoming more inflamed over time
4. DContractions growing stronger during labour

A mutation changes one amino acid in an enzyme. In which location is the change most likely to stop the enzyme from working?

1. AIn the active site
2. BIn the gene's stop codon
3. CIn a section that is removed after the protein is made
4. DOn the outer surface, far from the active site

एक प्रकाशीय सूक्ष्मदर्शी में 10× नेत्रिका (आईपीस) और 40× अभिदृश्यक लेंस है। कुल आवर्धन कितना है?

1. A400×
2. B40×
3. C4000×
4. D50×