________ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Fill in the blank(s) with the appropriate word(s).


Chlorine; Cl

Biology & Microbiology

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The only process that can lead to adaptations and directed genetic change of a population is:

a. natural selection. b. mutation. c. migration. d. genetic drift. e. inbreeding.

Biology & Microbiology

Which of the following is NOT a true statement regarding the prothallus?

a. It produces eggs. b. It results from a spore that lands on moist soil and grows. c. It is the free-living haploid life stage of a fern. d. It produces sperm. e. It has a conical structure.

Biology & Microbiology

As a farmer you spray your weed-infested crops with a herbicide containing glyphosate. Glyphosate stops plants from producing aromatic amino acids needed for development. The main reason you are not worried this will affect the growth of your crops is that

A. glyphosate-resistant crops are produced to create higher amounts of enzymes that make aromatic amino acids. B. crops have been sprayed with a soil bacteria that protects the plants from the mechanism of glyphosate. C. crops are genetically engineered to extract higher amounts of aromatic amino acid from the soil bacteria. D. different plants respond differently to glyphosate; some crops have an enzyme that breaks down glyphosate to a harmless substrate.

Biology & Microbiology

Contact transmission may occur indirectly when a nonliving intermediate called a _______ is involved

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology