The characteristic ____________________ of a radioisotope allows us to determine the age of rocks and fossils using
a technique called ____________________. Fill in the blank(s) with the appropriate word(s).
ANSWER: half-life, radiometric dating
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The number of circuits in the circulatory systems of humans is
(a) one. (b) two. (c) three. (d) four.
A genes expressed at a relatively constant level in tissues regardless of variations in the animal's condition is called a
A. transposable element. B. steady state gene. C. constitutive gene. D. recombinant gene. E. multifunctional gene.
Explain how transcriptional control by the NrpR protein of the archaeon Methanococcus maripaludis is similar to transcriptional control in bacteria. It is known that 2-oxoglutarate (2OG) is used by cells as an indicator of nitrogen deficiency
Based on what you know about effector molecules in bacterial operons, how would 2OG behave in M. maripaludis (as an inducer, a corepressor, etc.) and what effect would this molecule have on NrpR binding?
Fungi that live inside plant leaves and provide protection from insects are
A) mycorrhizae. B) photosynthetic. C) saprophytes. D) endophytes. E) lichens.