Successive nucleotides of a DNA chain are joined by:
A. phosphodiester bonds between the 5' carbon of one nucleotide and the 2' carbon of the next.
B. glycosidic bonds between the 5' carbon of one nucleotide and the 3' carbon of the next.
C. hydrogen bonds between the complementary bases.
D. ionic bonds between the phosphate group of one nucleotide and the sugar group of the next.
E. phosphodiester bonds between the 3' carbon of one nucleotide and the 5' carbon of the next.
E
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If it is still maintained in the human population, hemoglobin Lepore must be selected for in evolution
B) There should also be persons whose hemoglobin contains two copies of the series of amino acids that is deleted in hemoglobin Lepore. C) Each of the genes in the hemoglobin gene family must show the same deletion. D) The deleted gene must have undergone exon shuffling. E) The deleted region must be located in a different area of the individual's genome.
You come across a recipe for rhubarb pie. Never having heard of rhubarb, you do a little research. You find out that the part of a rhubarb plant that people eat is the petiole of a large leaf. You purchase some rhubarb for your pie and notice that it contains many long stringy fibers. Based on your knowledge of plant tissues, you know that the stringy fibers are
A. xylem tissue. B. collenchyma tissue. C. phloem tissue. D. sclerenchyma tissue. E. parenchyma tissue.
Choose the factors contributing to adaptive radiation of Drosophila in the Hawaiian Islands. Check all that apply.A) New islands are constantly being formed.B) There are high rates of mutation due to radioactive materials in the lava flows.C) The islands are highly volcanic.D) Drosophila species have no predators on the Hawaiian Islands.
What will be an ideal response?
The classic experiments conducted by Meselson and Stahl demonstrated that DNA replication is accomplished by employing a ________________ mechanism
(a) continuous (b) semiconservative (c) dispersive (d) conservative