A biology class was investigating the properties of active and inactive organisms. Students used sprouted and dry seeds, fresh and boiled yeast, and awake and etherized crickets. These organisms were chosen because they were from three different
A. kingdoms.
B. phyla.
C. classes.
D. kingdoms, phyla, and classes.
Ans: D. kingdoms, phyla, and classes.
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How is the coma of a comet produced?
a. Rocky material breaks off from the comet to form the coma. b. The coma is a cloud of particles that the comet has swept up in its orbital path. c. Ices vaporize to become gas that forms the coma around the comet. d. Particles in the solar wind get caught in the comet's magnetic field to form the coma.
Some M dwarf stars may host planets with life
a. True b. False Indicate whether the statement is true or false
In the process of science, which of these is tested?
A) a result B) an observation C) a hypothesis D) a control group
Cytotoxic T cells will bind with their TCR to which of the following?
A) antigens presented with MHC I molecules B) antigens presented with MHC II molecules C) free antigen in a soluble form D) haptens only