An operon is defined as:
a. a group of structural genes, with no regulatory sequences.
b. regulatory sequences upstream of a structural gene.
c. a group of related structural genes, plus their associated regulatory sequences.
d. one structural gene plus one regulatory gene.
e. a group of unrelated structural genes, plus their associated regulatory sequences.
c
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True or False: not all photosynthetic organisms are plants, but one thing they all have in common is that they can only be found within a narrow temperature and moisture range
A. true B. false
Flowering plants appeared in the fossil record in the:a
Tertiary period. b. Cenozoic era. c. Paleozoic era. d. Late Cretaceous period. e. Jurassic and Lower Cretaceous periods.
The neutrons of an atom are
A. found in the nucleus. B. positively charged. C. used to determine atomic number. D. moving in pathways called orbitals. E. always equal to the number of protons in an atom.
Which nervous system conserves energy by slowing the heartbeat and breathing rate and promoting digestion and elimination?
A. voluntary B. sympathetic C. parasympathetic D. autonomic E. somatic