Which layer of the skin is responsible for tanning?
A. epidermis
B. keratin
C. dermis
D. subcutaneous layer
E. hypodermis
Answer: A
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The phylogenetic trees of the nifH and SSU rRNA genes are incongruent because
A) nitrogenase is an anaerobic enzyme. B) nitrogenase evolves rapidly. C) of horizontal gene transfer. D) very few microbes have the nifH gene.
Light rays are refracted (bent) when they cross the interface between materials with different refractive indices.
Answer the following statement true (T) or false (F)
Which of the following bacteria causes Hansen's disease?
A. Mycobacterium tuberculosis B. Clostridium difficile C. Listeria species D. Corynebacterium species E. Mycobacterium leprae
Based on the phylogeny shown, which species is not a tree but has seeds?
A. Pine B. Rose C. Psaronius D. Oak E. Fern F. Ginkgo