What internal process helps plants to keep their movements and other responses synchronized with the day-night cycle?
A. Auxin cycling
B. Gravitropism
C. A circadian clock
D. Purine monitoring
E. Solar tracking
Answer: C
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The three main groups of known organisms include (select all that apply):
A. Bacteria. B. Archaea. C. Eukaryotes. D. Fungi. E. Prokaryotes.
In an XX embryo, ____ inactivation of one X chromosome usually occurs when the embryo has about 32 cells
a. phenotypic b. inhibited c. cascading d. selective e. random
Which of the following is a molecule that stimulates a response in the immune system?
a. MHC class II molecules b. Immunoglobins c. Antigens d. Interferons
A gene has been discovered in a eukaryote that is identical to a gene of a bacterium that the eukaryote normally engulfs and digests. This is probably due to
A. horizontal evolution. B. vertical evolution. C. convergent evolution. D. horizontal gene transfer.