The ________ suggests that speciation occurs in brief spurts
A) adaptive model of the origin of species
B) allopatric speciation model
C) gradual model of the origin of species
D) punctuated equilibrium model
Answer: D
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Why are some experts concerned about the use of the Bt toxin in agriculture?
a. Insects may develop resistance to the Bt toxin. b. The Bt toxin may be harmful to most mammals. c. The Bt toxin is not approved for organic farming. d. New diseases are introduced by the Bt toxin.
The contractile ring that works with animal cells could not work with plant cells because __________. Fill in the blank(s) with the appropriate word(s)
What form of gene therapy involves direct injection of DNA into cells within the body?
A) In situ hybridization B) In vivo C) In vitro D) Ex vivo E) Liposome mediated
Which of the following is not a set of master regulatory genes that control homeobox genes during development?
A) Polycomb B) Hox C) CURLY LEAF