If you count 73 plaques on a bacterial plate after you had plated 0.1 ml of a 10–4 dilution of phage, what was the initial concentration of the (undiluted) phage?
What will be an ideal response?
73 × 104 × 10 = 7.3 × 106 pfu/ml
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When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction
In birds and mammals, a vestige of the sinus venosus of the fish heart remains as the sinoatrial node, which serves as a(n)
A. pacemaker. B. inhibitory node. C. diastole detector. D. site of erythropoiesis. E. baroreceptor.
Menstrual flow results in the discharge of
a. the follicle. b. the corpus luteum. c. the endometrial lining. d. surface cells from the vagina. e. blood from the blood vessels on the outer surface of the uterus.
Parenchyma, collenchyma, and sclerenchyma are classified as tissues in the:a
dermal tissue system. b. vascular tissue system. c. ground tissue system. d. primary tissue system. e. secondary tissue system.