What is the dominant vegetation of the savanna?
A) Trees that lose their leaves
B) Cocoa
C) Grasses
D) Trees with waxy needles
E) Lichens and scrub willows
C
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The bacterium Alcaligenes eutrophus naturally produces polyhydroxybutyrate (PHB), a biodegradable thermoplastic. In 1992, Poirier, et al., reported in the journal Science that the two genes responsible for the production of PHB in bacteria had been introduced into the plant Arabidopsis thaliana, and it was demonstrated that the plants produced PHB. What type of vector was likely used to introduce the bacterial genes into the A. thaliana?
A. BAC. B. YAC. C. Ti plasmid. D. viral vector. E. BAC or YAC.
Which was responsible for destruction of the ozone layer?
a. chlorofluorocarbons b. carbon dioxide c. methylmercury d. methane e. nitrogen
The SA node, also known as the __________ spontaneously generates the action potentials that set the pace for
cardiac contractions. Fill in the blank(s) with the appropriate word(s).
How do you describe this type of transport across the cell membrane?
A. active transport B. passive transport C. facilitated diffusion D. co-transport