Question

Which is correct?

a
Both DNA and RNA molecules are MOSTLY double stranded
b
RNA is considered the information storage system while DNA elicits catalytic roles
c
DNA contains deoxyribose while RNA contains ribose, as the sugar
d
DNA contains uracil while RNA contains thymine

Answer 1

RNA molecules are typically single stranded and are involved in protein synthesis and regulation. RNA contains ribose and uracil, while DNA contains deoxyribose and thymine.

Step-by-step explanation:

Structurally speaking, ribonucleic acid (RNA), is quite similar to DNA. However, whereas DNA molecules are typically long and double stranded, RNA molecules are much shorter and are typically single stranded. RNA molecules perform a variety of roles in the cell but are mainly involved in the process of protein synthesis (translation) and its regulation.

RNA Structure: RNA is typically single stranded and is made of ribonucleotides that are linked by phosphodiester bonds. A ribonucleotide in the RNA chain contains ribose (the pentose sugar), one of the four nitrogenous bases (A, U, G, and C), and a phosphate group. The RNA-specific pyrimidine uracil forms a complementary base pair with adenine and is used instead of the thymine used in DNA. Even though RNA is single stranded, most types of RNA molecules show extensive intramolecular base pairing between complementary sequences within the RNA strand, creating a predictable three-dimensional structure essential for their function.