Bacterial cells have only one DNA molecule, which is double stranded and is replicated in essentially the same fashion as in eukaryotes
Imagine that, following the techniques of other scientists studying DNA, you created a bacterial cell that contains only radioactive nitrogen in its DNA. You then place the cell in a culture medium containing only "regular" (nonradioactive) nitrogen.
Based on this scenario and your knowledge of DNA structure and replication, how many cells will contain some DNA with radioactive nitrogen after four rounds of cell replication?
A) 16 B) 1 C) 2 D) 4 E) 8
C
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Four of the five answers listed below are generalizations of the cell theory. Select the exception
a. Cells are the structural and functional components of living things. b. Cells arise from preexisting cells. c. All organisms are composed of cells. d. Cells are the basic living unit or organization of living things. e. All cells have a nucleus.
Duplicated centrioles move to opposite poles of a(n) ____ cell during ____ of the cell cycle
a. animal; prophase b. plant; prophase c. animal; metaphase d. plant; metaphase e. both animal and plant cells; prophase
Which scientist is given credit for proposing the endosymbiont theory?
A. Svante Arrenhius B. Charles Darwin C. Stanley Miller D. Louis Pasteur E. Lynn Margulis
The special structure in which some actinomycetes form their spores is called a ________.
A. basidium B. sporangium C. conidium D. sporatorium