Gene expression requires the participation of the following three types of RNA: __________,
__________and __________. Fill in the blank(s) with the appropriate word(s).
ANS: messenger RNA (mRNA); transfer RNA (tRNA); ribosomal RNA (rRNA).
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How are plasmids different than chromosomes?
A) Plasmids are always small, linear pieces of DNA. B) Plasmids are composed of single-stranded DNA. C) Plasmids contain genes that are NOT essential for cellular growth and replication. D) Plasmids carry unimportant genes that are of little significance for the ecology and metabolism of an organism.
As part of microbiology laboratory practical, you are given a mixed culture that contains Salmonella spp., E. coli, Enterococcus spp., Staphylococcus aureus and Saccharomyces cerevisiae and other microorganisms. Describe the methods you can use to isolate and identify Salmonella spp., E. coli and Staphylococcus aureus from the mixed culture?
What will be an ideal response?
One of the most common causes of mental retardation in the United States is
a. congenital rubella syndrome. b. cocaine addiction. c. fetal alcohol syndrome. d. use of thalidomide by pregnant women. e. use of tetracycline by pregnant women.
The circulatory system of bony fishes, rays, and sharks is similar to
A) that of birds, with a four-chambered heart. B) the portal systems of mammals, where two capillary beds occur sequentially, without passage of blood through a pumping chamber. C) that of reptiles, with one pumping chamber driving blood flow to a gas-exchange organ, and a different pumping chamber driving blood to the rest of the circulation. D) that of sponges, where gas exchange in all cells occurs directly with the external environment. E) that of humans, where there are four pumping chambers to drive blood flow.