उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

Which list gives the main taxonomic ranks from broadest to most specific?

1. AKingdom, domain, class, phylum, family, order, species, genus
2. BDomain, kingdom, phylum, class, order, family, genus, species
3. CSpecies, genus, family, order, class, phylum, kingdom, domain
4. DDomain, phylum, kingdom, order, class, genus, family, species

What is a stem cell?

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

What does transfer RNA (tRNA) do?

1. AIt joins two DNA strands together
2. BIt copies DNA in the nucleus
3. CIt brings amino acids to the ribosome
4. DIt carries the code out of the nucleus

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

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

Why are G–C base pairs held together more strongly than A–T pairs?

1. AG–C pairs are joined by strong covalent bonds instead of hydrogen bonds
2. BG–C pairs form three hydrogen bonds, and A–T pairs form two
3. CG and C are both purines, so they fit more tightly
4. DA–T pairs are found only in RNA

एंज़ाइम रासायनिक अभिक्रिया को कैसे तेज़ करता है?

1. Aवह कोशिका का तापमान बढ़ाता है
2. Bवह अभिकारक के रूप में खप जाता है
3. Cवह सक्रियण ऊर्जा को घटाता है
4. Dवह उत्पादों में ऊर्जा जोड़ता है

HIV infects and destroys helper T cells. Why do people with untreated advanced HIV get infections that healthy people rarely get?

1. AHelper T cells make the antibiotics that the body needs to fight infection
2. BThe virus turns harmless microbes into pathogens
3. CTheir immune response is too weak to control normally harmless microbes
4. DHIV kills the normal flora of the skin and gut

A new infectious agent passes through filters that trap bacteria, does not grow on nutrient agar and multiplies only inside living cells. What is it most likely to be?

1. AA bacterium
2. BA virus
3. CA fungus
4. DA protozoan