Scientists developed a set of guidelines to address the safety of DNA technology. Which of the following is one of the adopted safety measures?
A) Microorganisms used in recombinant DNA experiments are genetically crippled to ensure that they cannot survive outside of the laboratory.
B) Genetically modified organisms are not allowed to be part of our food supply.
C) Transgenic plants are engineered so that the plant genes cannot hybridize.
D) Experiments involving HIV or other potentially dangerous viruses have been banned.
A
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Xylem tissue may contain each of these cell types, except which?
A. vessel members B. tracheids C. sieve cells D. fibers E. rays
In meiosis, sister chromatids separate
a. before DNA replication. b. before crossing over. c. during Anaphase I. d. during Anaphase II. e. never; sister chromatids do not separate in meiosis.
Which of the following conditions is not known to be a cause of kidney failure?
a. exposure to lead, arsenic, or pesticides b. complications of diabetes c. high blood pressure d. fever from influenza
What is the mode of nutrition for most Poriferans?
a. parasites b. autotrophs c. carnivores d. herbivores e. suspension feeders