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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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
The three main groups of known organisms include (select all that apply):
A. Bacteria. B. Archaea. C. Eukaryotes. D. Fungi. E. Prokaryotes.
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.
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