The proteins necessary for the use of lactose in E. coli are collectively called the
A. lac suppressor.
B. lac transcriptional operator.
C. lac promoter.
D. lac regulator.
E. lac operon.
Answer: E
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Arrow "B" points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in most adult vertebrates by the vertebral column. e. includes all of these
Land vertebrates evolved which of the
following to help maintain water balance? a. circulatory system b. thyroid c. kidneys d. liver e. none of these
What two-word term describes food that has been stripped of most of its nutrients?
What will be an ideal response?
DNA fingerprinting is now widely used to tie a particular suspect to the DNA samples found at a crime scene. What benefits can be derived from this technology in fighting crime?
A) A jailed convict can be proven to have no connection to evidence found at a crime scene. B) Solid matches can aid a district attorney's case in proving guilt to a jury. C) "Persons of interest" can be excluded more rapidly as suspects, so police can focus on other leads. D) All of the above are true.