Answer the following statements true (T) or false (F)
1. Soil can contain the spores that cause botulism, gas gangrene, and tetanus.
2. Chlamydial genital infections and gonorrhea are the two most common nationally notifiable infectious diseases in the United States.
3. The levels of chlorine routinely used for water treatment are sufficient to kill Giardia cysts and Cryptosporidium oocysts.
4. Yersinia pestis, the bacterium that causes plague, is one of the pathogens most often discussed as a potential biologic weapon.
5. Gonorrhea is considered to be a communicable disease, but not a contagious disease.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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What would be a set of anticipated results from a "Lederberg" experiment?
A. Total number of colonies on a plate: 1500 Total number of resistant colonies on replica plate with T1: 150 B. Total number of colonies on a plate: 1500 Total number of resistant colonies on replica plate with T1: 1500 C. Total number of colonies on a plate: 500 Total number of resistant colonies on replica plate with T1: 1500 D. Total number of colonies on a plate: 1500 Total number of resistant colonies on replica plate with T1: 0
Structures used in recombinant DNA technology to carry the DNA from the cells of one species to the cells of another species are
A) cloning vectors. B) restriction enzymes. C) sticky ends. D) donor DNA.
In a cross of Ss x Ss, the probability of having a heterozygous genotype is
A. 3/4. B. 1/4. C. 1/3. D. 2/3. E. 1/2.
The largest living reptiles ever on earth were the ________.
Fill in the blank(s) with the appropriate word(s).