Homologous recombination is an important mechanism in which organisms use a "backup" copy of the DNA as a template to fix double-strand breaks without loss of genetic information
Which of the following is not necessary for homologous recombination to occur?
(a) 3? DNA strand overhangs
(b) 5? DNA strand overhangs
(c) a long stretch of sequence similarity
(d) nucleases
(b)
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The need for larger and more frequent doses of a drug is called
a. addiction. b. habituation. c. psychological dependence. d. synergism. e. tolerance.
Extensive irrigation may contribute to global climate change because it may cause droughts in some semi-arid regions of the world.
a. true b. false
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their secondary walls may be impregnated with lignin. B. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. C. They have thick, tough secondary walls. D. They lack living protoplasts when mature. E. They form fibers and sclereids.
Gene regulation can involve a protein repressor that blocks ________ from initiating transcription.
A. RNA polymerase B. mRNA C. rRNA D. DNA polymerase I E. DNA polymerase III