Thymine is a nitrogenous base that is found in DNA molecules but not in RNA molecules, according to Vision Learning. Instead of thymine, RNA molecules utilize uracil.
DNA and RNA are both comprised of nucleotides that bind to a sugar backbone. The DNA nucleotide bases include adenine, cytosine, guanine and thymine. The RNA nucleotide bases include adenine, uracil, guanine and cytostine. Another difference between the two compounds is their structure. DNA molecules are double-stranded and their nucleotides are bound together by hydrogen bonds. DNA molecules also utilize deoxyribose as their sugar backbone. RNA molecules are single-stranded and utilize ribose as their sugar backbone, according to Vision Learning.Learn More
DNA ligase is an enzyme that repairs irregularities or breaks in the backbone of double-stranded DNA molecules. It has three general functions: It seals repairs in the DNA, it seals recombination fragments, and it connects Okazaki fragments (small DNA fragments formed during the replication of double-stranded DNA). DNA ligase functions by forming a bond between the end of a “donor” nucleotide and the end of an “acceptor” nucleotide.Full Answer >
The powerful enzyme DNA helicase unwinds the double strands of DNA by breaking the bonds between each of the complementary bases. These bases are held together by strong hydrogen bonds, but in breaking these, DNA helicase creates two single-stranded DNA molecules.Full Answer >
Examples of polygenic inheritance in humans include height, eye color and skin color. Physical traits that have polygenic inheritance are influenced by more than one gene and typically display a continuous distribution, such as a range of heights. Polygenic traits do not have the classic phenotypic ratios of Mendalian inheritance.Full Answer >
In living organisms, lipids play the important roles of storing energy and ensuring proper cell membrane development. Lipids come in several different varieties, and exist in all locations throughout the bodies of humans and animals. They retain crucial supplies of fat and nutrients, which allows people and animals to survive for several days without eating food, if necessary.Full Answer >