उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

Which bonds hold the two strands of a DNA double helix together?

1. AHydrogen bonds between the bases
2. BPeptide bonds between the sugars
3. CDisulfide bonds between the bases
4. DIonic bonds between the phosphates

What does the polymerase chain reaction (PCR) do?

1. AIt cuts DNA at specific sequences
2. BIt turns RNA into protein
3. CIt separates proteins by their charge
4. DIt makes many copies of a piece of DNA

What is true of a recessive allele?

1. AIts trait shows whenever one copy is present
2. BIt is always harmful to the organism
3. CIts trait shows only when two copies are present
4. DIt is found only on the X chromosome

लाल रक्त कोशिका को शुद्ध पानी में रखा जाता है। सबसे संभावित क्या होगा?

1. Aवह सिकुड़कर सिलवटदार हो जाती है
2. Bवह फूल जाती है और फट सकती है
3. Cउसका आकार वैसा ही रहता है
4. Dवह दो कोशिकाओं में विभाजित हो जाती है

वैज्ञानिक प्रयोग को दोहराते या अनेक प्रतिदर्शों का उपयोग क्यों करते हैं?

1. Aहर बार स्वतंत्र चर बदलने के लिए
2. Bपरिणामों पर संयोग का प्रभाव घटाने के लिए
3. Cयह सुनिश्चित करने के लिए कि परिकल्पना सत्य सिद्ध हो जाए
4. Dनियंत्रण समूह की ज़रूरत से बचने के लिए

A solution of pH 4 is compared with a solution of pH 6. How many times more hydrogen ions does the pH 4 solution have?

1. A100 times
2. B2 times
3. C20 times
4. D10 times

A scientist wants to show that a particular microbe causes a disease. According to Koch's postulates, which step is needed?

1. AThe disease must be treated successfully with antibiotics
2. BThe microbe grown from a sick host must cause the disease in a healthy host
3. CThe microbe must be seen in the blood under a light microscope
4. DThe microbe must be found in healthy hosts just as often as in sick hosts

Sweating cools the body. Which property of water best explains this?

1. AIt takes a lot of heat energy to evaporate
2. BIt has a very low specific heat
3. CIt is less dense as ice than as a liquid
4. DIt is a nonpolar solvent