What forces hold the two strands of DNA together quizlet?
What forces hold the two strands of DNA together quizlet?
The two strands of DNA held together by hydrogen bonds between the nitrogenous bases adenine and thymine, and between guanine and cytosine.
How are two DNA strands attracted to one another?
Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.
How many types of bonds are present in DNA?
two types
Which of the following bonds is not present in DNA?
Adenine and thymine only have two. This extra hydrogen bond helps make the cytosine-guanine pair favorable because it increases stability, and reduces bond energy. Ionic and covalent bonds do not occur between nitrogenous bases in DNA. Covalent bonds are found in the DNA backbone (known as phosphodiester bonds).
Are peptide bonds present in DNA?
Nucleic acids (i.e., DNA and RNA) are made up of nucleotide monomers. Peptide bonds are formed between the carboxylic acid group of one amino acid and the amine group of a second amino acid. One of the twenty amino acids, called cysteine, contains a sulfhydryl group as its side chain group.
Which one of the following bond type is present in RNA?
Phosphodiester bonds are central to all life on Earth as they make up the backbone of the strands of nucleic acid. In DNA and RNA, the phosphodiester bond is the linkage between the 3′ carbon atom of one sugar molecule and the 5′ carbon atom of another, deoxyribose in DNA and ribose in RNA.
Which one of the following is not present in RNA?
Thymine base is not present in RNA. In RNA, uracil is found in place of thymine.
Which is the shortest RNA?
tRNA
Is RNA only present?
Uracil is the nitrogenous base present only in RNA, but not in DNA. DNA have thymine, guanine, adenine and cytosine. Thymine is replaced by uracil in RNA.