Which of the following encases a nematode body and provides it with support?
a. cuticle
b. hemocoel
c. spiracle
d. chitin
a. cuticle
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Mutations in the Pax6 gene cause developmental defects in the eyes of flies, mice, and humans. This suggests that:
A. the eyes of flies, mice, and humans evolved by convergent evolution. B. Pax6 may be a master regulator of eye development. C. Pax6 has been evolutionarily conserved. D. Pax6 may be a master regulator of eye development that has been evolutionarily conserved. E. Pax6 may be a master regulator of eye development that has evolved independently in the lineages leading to flies, mice, and humans.
What is the role of RAG1 and RAG2 in immunoglobin rearrangement?
What will be an ideal response?
Which of the following organisms best describes a catalase-negative, gram-positive coccus that is hemolytic on sheep blood agar, and bacitracin positive?
a. Streptococcus pyogenes b. Streptococcus pneumoniae c. Staphylococcus epidermidis d. Micrococcaceae spp.
Biomagnification usually happens for chemicals that
A. are not readily degraded. B. dissolve in fat. C. dissolve in water. D. are not readily degraded and dissolve in fat. E. are not readily degraded and dissolve in water.