The most unique feature of the echinoderms is their:a
digestive system.
b. nervous system.
c. closed circulatory system.
d. water vascular system.
e. mantle.
D
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Which type of medium support growth of mutant bacteria that are threonine auxotrophs?
A. Since threonine is essential for growth, threonine auxotrophs do not grow on any type of media. B. Threonine auxotrophs only grow on media that lacks threonine. C. Since threonine is essential for growth, threonine auxotrophs can grow on any type of media. D. Threonine auxotrophs only grow on media that is supplemented with threonine.
An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ________.
A. halotroph B. saprobe C. heterotroph D. photoautotroph E. chemoheterotroph
Which one of the following cell organelles contains RNA?
A. ribosome B. endoplasmic reticulum C. Golgi body D. centriole
The majority of plant species today are
A) angiosperms. B) bryophytes. C) gymnosperms. D) seedless vascular plants.