In an F+ × F- mating, all or part of the host chromosome usually is transferred to the recipient.
Answer the following statement true (T) or false (F)
False
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The exposure of plants to low temperatures in order to stimulate flowering is called
a. cryptotropism. b. thigmotropism. c. vernalization. d. florigen. e. cryotropism.
The four-chambered heart first evolved among the:a
arthropods. b. birds. c. nonavian reptiles. d. mammals. e. fishes.
Which of the following statements is true?
a. Presently, extinctions are occurring at a very slow pace. b. Mutations, both contemporary and prehistoric, have been the single greatest cause of extinctions. c. The fossil record indicates that there has been very little animal extinction until recently. d. Evolutionary history is often represented by extinctions. e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.
What types of media are commonly used to isolate anaerobic microbes?
A) defined media B) differential media C) complex media D) reducing media E) selective media