The principal polysaccharide found in fungal cell walls is also found in
a. archaebacterial cell walls.
b. eubacterial cell walls.
c. cell walls of land plants.
d. cell walls of red algae.
e. insect exoskeletons.
E; Fungal cell walls have chitin, a component of insect exoskeletons. Eubacterial cells (choice a) have peptidoglycan, land plants (choice c) have lignin and cellulose, and red algae (choice d) have agar and carrageenan.
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When two or more genes from the same genome have nucleotide sequences so alike that they most probably arose from gene duplication those genes are called ________.
A. homologs B. duologs C. orthologs D. paralogs
Why are most bryophytes less than 10 cm tall?
A. They have underdeveloped stomata. B. They are seedless. C. They lack a cuticle. D. The have conducting cells instead of tracheids. E. They have no H2O transport mechanisms.
Soil mineral particles that are less than 0.002 mm in diameter are called ____
a. sand b. humus c. clay d. silt e. microparticles
Which of the following does not produce ionizing radiation?
A. X-rays B. nuclear fuel C. radon gas D. ultraviolet radiation E. none of these are ionizing radiation