What is in RNA, but not in DNA?
a.) thymine
b.) thyroid
c.) adenine
d.) uracil
The correct answer is (d) uracil. Uracil is a nitrogenous base found in RNA, but it is not present in DNA. DNA instead contains the nitrogenous base thymine. So, while adenine is found in both RNA and DNA, thymine is found only in DNA and uracil is found only in RNA.
The correct answer is d.) uracil. Uracil is found in RNA but not in DNA. To determine this, let's compare the structures of RNA and DNA.
RNA (ribonucleic acid) and DNA (deoxyribonucleic acid) are both nucleic acids that play important roles in genetic information transfer and gene expression. They have similar structures but also some key differences.
Both RNA and DNA are composed of a sugar-phosphate backbone and four nucleotide bases: adenine (A), cytosine (C), guanine (G), and thymine (T). However, DNA contains thymine (T) as one of its bases, while RNA contains uracil (U) instead of thymine.
To remember this distinction, you can use the mnemonic "RNA has U (Uracil) in it, while DNA has T (Thymine)".
Therefore, the correct answer to the question is d.) uracil. It is found in RNA but not in DNA.