उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

Which enzyme adds new nucleotides to build a new DNA strand?

1. ARNA polymerase
2. BHelicase
3. CPepsin
4. DDNA polymerase

What is an antigen?

1. AA white blood cell that engulfs and digests bacteria
2. BA drug that kills viruses
3. CA molecule that the immune system sees as foreign
4. DA protein that carries oxygen

What is the SI base unit of mass?

1. AGram
2. BPound
3. CKilogram
4. DLitre

What does Mendel's law of segregation state?

1. AGenes on different chromosomes are always inherited together
2. BEach gamete receives both alleles of every gene
3. CDominant alleles are more common in a population than recessive ones
4. DThe two alleles of a gene separate so each gamete gets only one

A seedling is 4 cm tall at week 1, 8 cm at week 2, 12 cm at week 3 and 16 cm at week 4. If the trend continues, how tall will it be at week 6?

1. A20 cm
2. B18 cm
3. C24 cm
4. D32 cm

When most people in a community are vaccinated, people who cannot be vaccinated are also protected. Why?

1. AThe pathogen mutates into a harmless form
2. BThe vaccine spreads from person to person
3. CVaccinated people make antibodies for others
4. DThe pathogen has too few hosts to spread easily

Bacteria from hot springs have enzymes that work best at about 80 °C, while most human enzymes work best near 37 °C. What is the best explanation?

1. ATheir enzymes do not have an active site, so heat cannot affect them
2. BTheir enzymes have structures that stay stable at high temperatures
3. CTheir enzymes are made of lipids, not proteins
4. DHigh temperature never affects any enzyme

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A8 mm
2. B0.2 mm
3. C2 mm
4. D0.5 mm