________ are hollow tube-like structures that hold some archaeal daughter cells together after cell division while ________ are grappling hook-like structures that appear to attach archaeal cells to surfaces.
A. Cannulae; pili
B. Cannulae;hami
C. Pili; hami
D. Hami; fimbriae
Answer: B
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Calcium ions can act as second messengers by binding to ____, which then regulates other proteins
a. cyclic AMP b. calmodulin c. protein kinase d. phosphodiesterase e. adenylyl cyclase
states that two species cannot coexist indefinitely in the same niche.
A. Zonal exclusion theory B. Endosymbiotic theory C. Co-inclusion principle D. Competitive exclusion principle E. Second law of thermodynamics
Proto-oncogenes can be converted to oncogenes by:
a. mutation. b. tumor suppressor genes. c. growth factors. d. transcription factors. e. infection by certain viruses.
Almost all plants are ____________ because the only nutrients they require are water and minerals from the soil and carbon dioxide from the air.
Fill in the blank(s) with the appropriate word(s).