Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Concept explainers

DNA and RNA
Deoxyribonucleic acid (DNA) is usually called the blueprint of life. Deoxyribose is a monosaccharide that has a key function in the synthesis of deoxyribonucleic acid. One less oxygen-containing hydroxyl group occurs in deoxyribose sugar. Nucleic acid, d…
DNA as the Genetic Material
DNA, or deoxyribonucleic acid, is a long polymeric nucleic acid molecule discovered in the late 1930s. It is a polymer; a long chain-like molecule made up of several monomers connected in a sequence. It possesses certain characteristics that qualify it a…
Genetics
The significant branch in science which involves the study of genes, gene variations, and the organism's heredity is known as genetics. It is also used to study the involvement of a gene or set of genes in the health of an individual and how it prevents …
DNA Replication
The mechanism by which deoxyribonucleic acid (DNA) is capable of producing an exact copy of its own is defined as DNA replication. The DNA molecules utilize a semiconservative method for replication.
Question

A primitive eukaryote was discovered that displayed a unique
nucleic acid as its genetic material. Analysis revealed the following
observations:
(a) X-ray diffraction studies display a general pattern similar
to DNA, but with somewhat different dimensions and more
irregularity.

(b) A major hyperchromic shift is evident upon heating and
monitoring UV absorption at 260 nm.
(c) Base-composition analysis reveals four bases in the following
proportions:
Adenine = 8% Hypoxanthine = 18%
Guanine = 37% Xanthine = 37%
(d) About 75 percent of the sugars are deoxyribose, whereas
25 percent are ribose.
Attempt to solve the structure of this molecule by postulating a
model that is consistent with the foregoing observations.

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