Which nonlactose-fermenting organism, that rarely causes human infection, grows poorly at 35°C; however, grows optimally between 20°C and 25°C?
a. Psychrobacter pulmonis
b. A. xylosoxidans
c. R. radiobacter
d. S. putrefaciens
A
Psychrobacter spp. usually grows poorly at 35°C and grows best between 20°C and 25°C. R. radiobacter optimally grows at 25°C to 28°C, but it is also capable of growth at 35°C.
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Genes are arranged in threadlike bodies called chromosomes
Indicate whether the statement is true or false
Some living organisms possess RNA as their only genetic material.
Answer the following statement true (T) or false (F)
Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope 35S. After a 48-hour incubation, the 35S would most likely be found in the S. cerevisiae's
a. Carbohydrates. b. Nucleic acids. c. Water. d. Lipids. e. Proteins.
Within a chromosomal sequence of a dog, a researcher identifies a block of base pairs with very similar GC content. This observation is likely the result of:
a. horizontal gene transfer. b. replication errors. c. centromeres. d. gene duplication. e. This is unknown.