Q1. If relatively small carbonaceous chondrites from space were a significant source of Earth’s original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth? I. Carbonaceous chondrites must contain no D-amino acids. II. Earth’s early atmosphere must […]

1- Assume if you isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is cytosine, you could say with certainty that the nucleotide could have come from: – DNA but not RNA.– RNA but not DNA.– either DNA or RNA.– neither DNA nor […]

Marie sat quietly in the back of the class feeling relaxed, even though this was her first college class. “Here goes; this is the beginning of my future,” she excitedly thought. As the teacher walked to the front of the room, Marie suddenly felt dizzy and broke into a cold […]

Huntington’s disease is a rare autosomal dominant trait (lethal in the homozygous dominant condition). The mutation is an expansion of a nucleotide repeat in the DNA that encodes the huntingtin protein. Normal individuals have between 6-35 copies of a CAG repeat within the gene. Affected individuals can have between 36-121 […]