In addition to showing that DNA carries genetic information, the experiments of Avery, McCleod, and McCarty demonstrated that:
A: DNA is present in bacteriophage.
B: DNA may be taken up by bacterial cells and be active.
C: DNA is a double helix.
D: DNA binds to the cell wall of the bacterium.
E: eukaryotic cells may be genetically transformed.
Answer: B: DNA may be taken up by bacterial cells and be active.
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Answer the question using the accompanying figure. The atomic number of the atom depicted in the figure is ____
a. 4 b. 6 c. 8 d. 12 e. 18
The depolarization of the heart is initiated by the
A. left and right bundle branches. B. bundle of HIS. C. atrioventricular node. D. Purkinje fibers. E. sinoatrial node.
Tall (D) is dominant to dwarf (d). If a true-breeding tall plant is crossed with a true-breeding dwarf plant, the F2 generation will have a tall:dwarf phenotypic ratio of __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements regarding the definition of species is false?
A) The ecological species concept identifies species in terms of their ecological niches. B) The phylogenetic species concept defines a species as a set of organisms that shares a common ancestor and forms one branch on the tree of life. C) The morphological species concept relies upon comparing the DNA sequences of organisms. D) Under the biological species concept, the gap between species is maintained by reproductive isolation.