20. Which of the following bacteria is considered coliform? A. E. coli
B. Proteus​​​​​​​​​​​​​​​​​​​​​​​​​​ C. Salmonella
D. Shigella
21. The Enterotube is used to distinguish between:
A. Staphylococcus and Streptococcus
B. Proteus and Salmonella
C. Bacteria and Fungi
D. Antibiotic-resistant bacteria

22. What type of specimen is used to inoculate an Enterotube?
A. Throat swab
B. Stool
C. Urine
D. Blood
E. Sputum

23. Which bacteria gives positive test for urease when growing on urea broth?
A. Proteus
B. Enterobacter​​​​​​​​​​​​​​​​​​​​​​​ ​​​
C. Salmonella
D. Shigella

24. Which bacteria gives positive test for decarboxylase when growing on lysine broth?
A. Proteus
B. Enterobacter​​​​​​​​​​​​​​​​​​​​​​​ ​​​
C. Salmonella
D. Shigella

25. The Lethal Effect of UV light is specifically caused by
A. UV –A
B. UV-B
C. UV-C
D. Infrared

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)