Exam 3- DNA Structure and Analysis-Questions & Answers
Exam 3- DNA Structure and Analysis-Questions & Answers Friedrich Miecher - ANSWER-Who first isolated DNA from white blood cells, called it "nuclein", and noted that it was slightly acidic and high in phosphorus? When was DNA first isolated? - ANSWER-1869 What did Albrecht Kossel discover in 1901? - ANSWER-(Who discovered) DNA has 4 nitrogenous bases What are the 4 nitrogenous bases - ANSWER-Adenin, guanine, cytosine, and thymine (are what) (What did) Phoebus Levene discovered - ANSWER-DNA made of nucleotides (was discovered by) Structure of Nucleotide - ANSWER- tetra-nucleotide structure of DNA - ANSWER-Rectangle, at each point (starting from top) C-A-T-G Who proposed the tetranucleotide structure? - ANSWER-Phobus Levene (proposed what) What is the genetic Material? - ANSWER-Biologists knew genes reside on chromosomes by early 1900s, chromosomes are made of both DNA and protein (genetic material) Case for protein as the genetic material - ANSWER-Abundant (50% of cell dry weight), variability, Nucleic acid structure WAS too simple to account for necessary variability, easily accepted without testing for transmission genentics Who studied transformation in 1928? - ANSWER-Griffith (studied what?)
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