उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

DNA में कौन-से चार क्षारक पाए जाते हैं?

1. Aऐडेनिन, थाइमिन, ग्वानिन और साइटोसिन
2. Bऐडेनिन, थाइमिन, ग्लूकोज़ और साइटोसिन
3. Cऐलानिन, थाइमिन, ग्लाइसिन और सिस्टीन
4. Dऐडेनिन, यूरेसिल, ग्वानिन और साइटोसिन

What is the aim of gene therapy?

1. ATo remove all the genes from a patient's cells
2. BTo give a patient antibiotics through a vein to kill a virus
3. CTo treat a disease by adding a working copy of a faulty gene
4. DTo change the patient's blood type

Which gas do plants take in from the air for photosynthesis?

1. AHydrogen
2. BNitrogen
3. CCarbon dioxide
4. DOxygen

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. A20 times
2. B2 times
3. C100 times
4. D10 times

Why does PCR use a DNA polymerase taken from bacteria that live in hot springs?

1. AIt makes the DNA strands stick together
2. BIt survives the high temperatures used to separate the strands
3. CIt copies RNA as well as DNA
4. DIt works only in the dark, like the bacteria it comes from

Why do plants wilt when the soil around their roots becomes very salty?

1. AThe roots take in too much water
2. BSalt blocks sunlight from reaching the leaves
3. CSalt makes the root cells swell and burst
4. DWater leaves the root cells by osmosis

After a long course of broad-spectrum antibiotics, a patient develops severe diarrhoea caused by Clostridioides difficile. What is the most likely reason?

1. AThe antibiotics changed some of the harmless gut bacteria into C. difficile
2. BThe antibiotics killed normal gut bacteria that kept C. difficile in check
3. CThe antibiotics made the gut lining produce spores
4. DC. difficile was made by the patient's own immune system

Why are organ transplant patients usually given drugs that suppress the immune system?

1. AThe drugs change the donor organ's DNA so that it matches the patient
2. BThe drugs help the new organ to grow larger
3. CThe donor organ contains bacteria that must be killed
4. DTheir immune system would recognise the donor cells as foreign