NEET Biology: Biology and Human Welfare questions with solutions

Q1. Which of the following is true of RNA, but not DNA?

1. RNA contains ribose
2. RNA contains adenine, guanine, cytosine and thymine
3. RNA is usually double stranded
4. RNA is produced using complementary base pairing

Answer: RNA contains ribose

RNA differs from DNA in that it contains ribose sugar, while DNA contains deoxyribose. The other choices are incorrect because RNA uses uracil instead of thymine, is usually single-stranded, and both nucleic acids are made using complementary base pairing.

Q2. ATP binding site is located on/associated with

1. Troponin
2. Tropomyosin
3. Head part of meromyosin
4. Tail part of myosin

Answer: Head part of meromyosin

The ATP binding and ATPase site is located on the head of myosin (the heavy meromyosin portion). This head region forms cross-bridges with actin and uses ATP to drive muscle contraction.