उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What is a trait that is controlled by many genes called?

1. AA recessive trait
2. BA sex-linked trait
3. CA codominant trait
4. DA polygenic trait

What are the three domains of life?

1. APlants, animals and fungi
2. BBacteria, Archaea and Eukarya
3. CProkaryotes, plants and animals
4. DBacteria, viruses and protists

What is activation energy?

1. AThe heat released when a reaction finishes
2. BThe energy needed to start a chemical reaction
3. CThe energy plants take in from sunlight
4. DThe energy stored in a molecule of ATP

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

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

What is the role of cholesterol in animal cell membranes?

1. AIt carries glucose molecules across the membrane into the cell
2. BIt stores the cell's genetic information
3. CIt forms a rigid wall around the cell
4. DIt keeps membrane fluidity stable as temperature changes

Which statement about Archaea is correct?

1. AThey are prokaryotes, and many live in extreme environments
2. BThey are multicellular plants
3. CThey are eukaryotes that have a nucleus and membrane-bound organelles
4. DThey are a type of virus

Finches on the Galápagos Islands have different beak shapes on islands with different foods. What is the best explanation?

1. ANatural selection favoured beaks suited to each food source
2. BThe birds were all created with the same beak and it never changed
3. CEach bird changed its beak by using it more
4. DThe beaks changed because the birds chose to eat new food

Why are there usually far fewer top predators than herbivores in an ecosystem?

1. ATop predators reproduce faster than herbivores, so they die sooner
2. BTop predators need less energy than herbivores
3. CHerbivores eat the young of top predators
4. DEnergy is lost at each step, leaving little for the top level