उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

यूकैरियोटिक कोशिका में अधिकांश ATP कौन-सा कोशिकांग बनाता है?

1. Aराइबोसोम
2. Bमाइटोकॉन्ड्रिया
3. Cगॉल्जी उपकरण
4. Dलाइसोसोम

What is natural selection?

1. AIndividuals with helpful traits survive and reproduce more
2. BAnimals choosing which mates they like best, so traits change at random
3. COrganisms changing their genes when they need to
4. DHumans breeding plants for useful traits

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. ALipase
2. BLigase
3. CAmylase
4. DHelicase

What is a chromosomal translocation?

1. AA piece of one chromosome attaches to a non-matching chromosome
2. BA piece of a chromosome is flipped around in place
3. COne DNA base is replaced by another base
4. DA piece of a chromosome is copied twice and stays in the same place

What is the role of oxygen in aerobic respiration?

1. AIt is split to release the energy needed for glycolysis
2. BIt accepts electrons at the end of the transport chain
3. CIt breaks pyruvate into lactic acid
4. DIt is built into glucose molecules

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

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

Which evidence supports the theory that mitochondria came from bacteria that lived inside an ancient cell?

1. AThey are found in all prokaryotic cells
2. BThey have a cell wall made of peptidoglycan
3. CThey have their own circular DNA, ribosomes and a double membrane
4. DThey make the proteins used by the whole cell, including the nucleus

Two genes lie very close together on the same chromosome. In a test cross, most offspring look like the parents instead of the expected 1:1:1:1 ratio. Why?

1. AA frameshift mutation happened in both genes
2. BThe genes are on different chromosomes and assort independently
3. CThe genes are linked and are rarely separated by crossing over
4. DBoth genes show incomplete dominance