Rosalind Franklin created the first ____.
A. clear x-ray diffraction image of DNA as it occurs in cells
B. model of DNA’s nucleotide bases
C. experiment to test whether base-pairs differ among species
D. hypothesis surrounding the nature of a hereditary molecule
E. results proving that bases exist on the outside of a helix
Answer: A
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A mutation in the ruvB gene mostly likely will:
A. reduce resistance to UV light. B. increase binding of RuvA to DNA. C. increase binding of RuvB to DNA. D. stabilize the Holliday intermediate. E. increase recombination of DNA.
In a polymer of nucleotides, how does one nucleotide attach to another?
a. The base of one nucleotide is attached to the base of the next. b. The base of one nucleotide it attached to the sugar of the next. c. The sugar of one nucleotide is attached to the sugar of the next. d. The phosphate group of one nucleotide is attached to the base of the next. e. The phosphate group of one nucleotide is attached to the sugar of the next.
You are confronted with a box of preserved grasshoppers of various species that are new to science and have not been described. Your assignment is to separate them into species. There is no accompanying information as to where or when they were collected. Which species concept will you have to use?
A) biological B) phylogenetic C) ecological D) morphological
The biological species concept cannot be applied to ________
A) fungi that live on land B) bacteria that reproduce only asexually C) complex plants that have flowers D) animals that use asexual and sexual reproduction