उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

विषाणु (वायरस) अपने आप प्रजनन क्यों नहीं कर सकता?

1. Aवह केवल अर्धसूत्री विभाजन से विभाजित होता है
2. Bउसमें किसी भी प्रकार का आनुवंशिक पदार्थ, न DNA न RNA, नहीं होता
3. Cप्रतियाँ बनाने के लिए उसे परपोषी कोशिका की मशीनरी चाहिए
4. Dवह केवल धूप में प्रजनन करता है

A solution has a pH of 3. How is it described?

1. ABasic
2. BAcidic
3. CIsotonic
4. DNeutral

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

1. AHelicase
2. BLigase
3. CAmylase
4. DLipase

When plotting the results of an experiment, which variable usually goes on the y-axis?

1. AThe controlled variable
2. BThe independent variable
3. CThe dependent variable
4. DThe time the experiment started

Drugs against fungal infections often cause more side effects than drugs against bacteria. Why?

1. AFungal cells are eukaryotic, like human cells
2. BFungi are much smaller than bacteria
3. CFungi reproduce only by binary fission
4. DFungi have no cell membrane for drugs to act on

दो विषमयुग्मजी जनकों (Aa × Aa) का संकरण कराया जाता है। अपेक्षित जीनोटाइप अनुपात क्या है?

1. A1 AA : 2 Aa : 1 aa
2. B3 AA : 1 aa
3. C2 AA : 1 Aa : 1 aa
4. D1 AA : 1 aa

In the Hershey–Chase experiment, viruses were labelled with radioactive phosphorus in their DNA or radioactive sulfur in their protein. Only the phosphorus entered the infected bacteria. What did this show?

1. AViruses contain no DNA at all
2. BDNA, not protein, is the genetic material of the virus
3. CProtein, not DNA, is the genetic material of the virus
4. DBacteria take up any radioactive substance

A green plant is kept in a sealed jar in complete darkness for a day. What happens to the carbon dioxide level in the jar?

1. AIt falls, because plants take in more CO₂ when they respire in the dark
2. BIt stays the same, because plants do not respire
3. CIt rises, because the plant respires but cannot photosynthesise
4. DIt falls, because the plant keeps photosynthesising