Chlorine is consumed when it reacts with organic materials
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following is not a regulatory mechanism used to control the lactose operon in Escherichia coli?
A. Induction B. Attenuation C. Catabolite repression D. All of the choices are correct.
The type of contraception technique that prevents implantation (even after successful fertilization) is
a. tubal ligation. b. spermicidal jelly. c. birth control pills. d. intrauterine device. e. a diaphragm.
Ozone thinning over Antarctica was so profound that people referred to the lowest ozone region as the _________________.
A. ozone pollution layer B. greenhouse effect C. near-ground ozone D. radiation zone E. ozone hole
Which step is not involved in the fertilization of angiosperm flowers?
A. Double fertilization produces an embryo and the endosperm. B. Pollen is transported to a stigma of a flower. C. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style. D. The style of the pistil contracts to bring the sperm closer to the embryo sac. E. The pollen tube grows until it reaches the ovule in the ovary.