In 1952, Rosalind Franklin took an X-ray photograph that revealed the structure of DNA. James Watson and Francis Crick followed up on this discovery in 1953. They discovered that the molecule has a specific shape that can best be described as —
A. a single strand containing 4 different bases that vary depending on the type of DNA
B. ladder-shaped, containing 5 nitrogenous bases that bond to one another
C. triple-stranded, with bonds between each strand holding the three strands together
D. double-stranded and twisted, with bases bonded to other bases which hold the strands together
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Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?
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Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals
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In 1952, Rosalind Franklin took an X-ray photograph that revealed the structure of DNA. James Watson...
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