Which layer of the skin is responsible for tanning?

A. epidermis
B. keratin
C. dermis
D. subcutaneous layer
E. hypodermis


Answer: A

Biology & Microbiology

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Answer the following statement true (T) or false (F)

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Which of the following bacteria causes Hansen's disease?

A. Mycobacterium tuberculosis B. Clostridium difficile C. Listeria species D. Corynebacterium species E. Mycobacterium leprae

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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

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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.

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