AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is not true concerning the differences between RNA and DNA?
A
RNA contains pyrimidines while DNA contains purines.
B
The sugar in DNA contains one less oxygen than the sugar in RNA.
C
DNA forms a double helix while RNA is able to fold in on itself.
D
RNA is thought to have evolved before DNA.
Explanation: 

Detailed explanation-1: -The thing that is not a difference is C. So DNA and RNA are both made up of nucleotides. Nucleotides. It’s something like this as a phosphate group.

Detailed explanation-2: -Thus, the major difference between DNA and RNA is that DNA is double-stranded and RNA is single-stranded. DNA is responsible for genetic information transmission, whereas RNA transmits genetic codes that are necessary for protein creation.

Detailed explanation-3: -There are two main types of purine: Adenine and Guanine. Both of these occur in both DNA and RNA. There are three main types of pyrimidines, however only one of them exists in both DNA and RNA: Cytosine. The other two are Uracil, which is RNA exclusive, and Thymine, which is DNA exclusive.

Detailed explanation-4: -They are nitrogenous bases that make up the two different nucleotides in DNA and RNA. Purines (adenine and guanine) are two-carbon nitrogen ring bases while pyrimidines (cytosine and thymine) are one-carbon nitrogen ring bases.

There is 1 question to complete.