THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
double helix
|
|
|
always double stranded
|
|
|
usually double stranded
|
|
|
single stranded
|
Detailed explanation-1: -Ribonucleic acid (abbreviated RNA) is a nucleic acid present in all living cells that has structural similarities to DNA. Unlike DNA, however, RNA is most often single-stranded. An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA.
Detailed explanation-2: -Unlike double-stranded DNA, RNA is usually a single-stranded molecule (ssRNA) in many of its biological roles and consists of much shorter chains of nucleotides.
Detailed explanation-3: -RNA is just a copy of the DNA that unlike the DNA travels around the cell it helps the cell do certain things and because it needs to bond with amino acids and give genetic messages it has to have one strand in order to be unstable enough to bond with other molecules.
Detailed explanation-4: -Which molecule is always single-stranded? RNA is always single-stranded and is often referred to as single-stranded ribonucleic acid. This can be seen in Figure 1 below. However, DNA can be either double-stranded or a single strand of DNA (ssDNA).