List and explain five types of techniques that can be used to identify unknown microorganisms
What will be an ideal response?
There are five major types of identification techniques used in the microbiology lab. One method is simply observation and classification of the physical characteristics of an organism, which includes both cellular morphology and colony morphology. A second method is the use of biochemical tests, such as fermentation of carbohydrates or production of metabolic by-products, to place microbes in different groups. A third type of identification technique is serological testing, in which antibodies are used to detect particular antigens on the surfaces of different microbes in an effort to distinguish closely related species or strains of microbes. Phage typing is the fourth technique, which is the use of bacteriophages to infect bacterial cells; because bacteriophages are highly specific in their infection of cells, the patterns of infected and uninfected cells can be used to differentiate bacterial strains and species. A fifth method involves analyzing the genetic material of microbes, such as the percentage of G and C bases in a cell's DNA, to demonstrate possible relationships between species.
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The phospholipid molecules of most membranes
have a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. none of these.
Following anaphase in cell division, the structures produced by the separation of the sister chromatids.
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What do the two daughter cells generated by the first asymmetric division of the plant zygote become?
A. The egg and pollen B. The root and the shoot C. The epicotyl and the hypocotyl D. The suspensor and the embryo E. The xylem and the phloem
Male Drosophila melanogaster accessory gland proteins increase egg production in fe-males. Why does this function represent a case of sexual conflict?
a. It doesn't because increased egg production will also increase a female's fitness. b. It reduces female longevity and the chance of a female to mate with other males. c. It effectively changes the mating system toward a form that is more favora-ble to males. d. It reduces the fertility of female eggs. e. B and C.