An Hfr cell and an F- cell result from conjugation between a donor cell and a recipient cell. Which statement is false regarding this event?
A. The recipient could have been F-.
B. The donor could have been either F- or F+.
C. The donor could have been Hfr.
D. The donor could not have been F-.
Answer: B
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Which of the following may form one colony?
A. A single bacterial cell B. A small clump of bacteria C. A short chain of bacteria D. All of the choices are correct.
The Meselson-Stahl experiments supported the model of dispersive DNA replication
Indicate whether the statement is true or false
____ occurs within a single plant, while ____ occurs between two plants
a. A dihybrid cross; a monohybrid cross b. Epistasis; polygenic inheritance c. A testcross; cross-pollination d. Self-pollination; cross-pollination e. A dihybrid cross; self-pollination
Although children believe that "holding my breath until I die" is possible, why should parents not be concerned by this threat?
A) As a child holds his or her breath, oxygen levels build, stimulating breathing by the brain stem. B) As a child holds his or her breath, oxygen levels decrease, stimulating breathing by the brain stem. C) As a child holds his or her breath, carbon dioxide levels decrease, stimulating breathing by the brain stem. D) As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.