Scarlet fever and rheumatic fever are both caused by
A. Clostridium tetani.
B. Salmonella sp.
C. Staphylococcus aureus.
D. Streptococcus pyogenes.
D. Streptococcus pyogenes.
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Which of the following is not a characteristic of a hormone?
A. chemical messenger B. secreted from glands into the blood C. acts on distant target cells D. regulates organ systems E. secreted from glands into the interstitial fluid
In Gram-stained preparations, M. lacunata will appear as:
a. either gram-negative coccobacilli or short, broad rods that tend to resist decoloriza-tion and may appear gram-variable. b. gram-negative cocci in pairs or short chains. c. coccobacilli or medium-sized rods. d. coccobacilli that may appear in chains.
Which of the following statements is true about sex linked disorders? a. Only the mother's chromosomes will determine the sex linked disorders of all of her children
b. Both parents' chromosomes will influence their daughters sex linked disorders equally. c. The father's chromosomes will determine the sex linked disorders of his daughters. d. The mother's chromosomes will determine the sex linked disorders of her daughters. e. Only the father's chromosomes will determine the sex linked disorders of all of his children.
This region exhibits 90% interference. How many double crossovers would be recovered in a three-point cross involving b, c, and sp out of 1000 progeny?
In Drosophila, the genes b, c, and sp are linked and arranged as shown below: b——30 m.u.——c——20 m.u.——sp A) 3 B) 6 C) 54 D) 60 E) 600