Which of the plant growth regulators is not transported, but stays within the cell that produced it?
a. gibberellins
b. ethylene
c. phytochrome
d. cytokinins
e. auxins
C
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Which of the following is not a step in bacterial nucleotide excision repair (NER)?
A. The UvrA2UvrB complex creates a single-stranded bubble at the damage site to which UvrA subunits are tightly bound and the UvrB subunit dissociates. B. The UvrA2UvrB complex scanned the DNA for damage. C. Pol I fills the gap created by the removal of the damaged strand and the DNA is sealed by ligase. D. UvrC (exinuclease) nicks the damaged strand on one side of the damage randomly. E. UvrD (helicase) unwinds and releases the damaged strand.
The episome in an Hfr strain is inserted near the trp (tryptophan operon) locus. This Hfr strain is grown with an F- Trp- strain. From this mating, we isolate an F+ Trp+ strain that can readily impart the Trp+ phenotype to F- Trp- strains, but no other traits are ever transferred. (When the original Hfr strain is mated with F? strains, traits other than Trp+ can be transferred, although at lower frequency than Trp+.) What most likely has happened?
A) An F? trp+ plasmid has been generated. B) Mutation occurred. C) Transduction occurred. D) Transformation occurred.
The cuticle of a plant is primarily for
a. retention of water. b. conduction of water. c. absorption of carbon dioxide. d. protection from strong sunlight. e. mechanical support
Mitochondria transfer ________ energy from ________ to ATP; chloroplasts transform ________ energy into the chemical energy of ATP
A) chemical; food; light B) food; light; chemical C) light; food; kinetic D) food; light; nuclear