Bayliss and Starling first demonstrated the existence

of hormones when they were studying which of the
following?
a. thymus
b. islets of Langerhans
c. bursa of fabricus
d. pancreas
e. none of the above


Answer: d

Biology & Microbiology

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The DNA-binding proteins of almost all regulatory proteins use one of a small set of shapes that enable them to fit into the DNA major groove. These shapes are called  

A.  structural motifs. B.  DNA prints. C.  fingerprints. D.  repressors. E.  transcriptional domains.

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Which statement most accurately describes the evolutionary relationships among the three domains?

A. Bacteria and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with Eukarya. B. Bacteria and Eukarya diverged from a common ancestor more recently than they diverged from their common ancestor with Archaea. C. Eukarya and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with Bacteria. D. All three domains diverged from a common ancestor at the same time.

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Could two phenotypically normal parents have a color-blind child?

a. Yes b. No

Biology & Microbiology

In the Gulf of Mexico dead zone, oxygen levels in lower water levels are low because ____.

a. phytoplankton consume vast quantities of oxygen without producing any oxygen b. the runoff into the dead zone is contaminated with high densities of bacteria that consume oxygen c. of the Great Lakes d. pollutants in runoff, especially fertilizers, lead to phytoplankton growth and the dead phytoplankton are consumed by bacteria that use up oxygen e. the runoff into the dead zone is already extremely low in oxygen and mixes with the water already present in the Gulf of Mexico

Biology & Microbiology