Assume that one counted 67 plaques on a bacterial plate where 0.1 ml of a 10?5 dilution of phage was added to bacterial culture. What is the initial concentration of the undiluted phage?
A) 67 pfu/ml
B) 0.1 × 105 pfu/ml
C) 6.7 × 105 pfu/ml
D) 6.7 × 10?5 pfu/ml
E) 6.7 × 107 pfu/ml (pfu = plaque-forming units)
Answer: E
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When an apical meristem cell divides, one daughter cell is called the initial and the other is called the derivative. What are the fates of these cells?
a. The initial is used to form primary meristems, and the derivative remains part of the apical meristem. b. Both the initial and the derivative remain part of the apical meristem. c. The initial remains part of the apical meristem, and the derivative is used to form primary meristems. d. Both the initial and the derivative are used to form primary meristems. e. The initial is used to form primary meristems, and the derivative is used to form secondary meristems.
What raises the pH of chyme so that digestive enzymes can function in the small intestine?
a. bicarbonate b. pepsin c. gastrin d. bile e. brush border enzymes
The inheritance pattern demonstrated by the pedigree in accompanying figure is:
a. autosomal recessive. b. autosomal dominant. c. X-linked recessive. d. X-linked dominant. e. undeterminable from these data.
first part of the small intestine
What will be an ideal response?