In a dicot stem, the ________ is between the vascular cambium and the cork cambium
A) cork
B) xylem
C) phloem
D) pith
E) apical meristem
C
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Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 36 B) 9 C) 18 D) 4 E) 72
The repolarization phase of an action potential is dependent on the sodium-potassium pump
Indicate whether the statement is true or false
Which microscope is used to see detail of a 300-nm virus?
A) fluorescence microscope B) phase-contrast microscope C) darkfield microscope D) DIC microscope E) electron microscope
How pathogenic are alpha toxin–containing clostridia compared to those lacking it, and why?
a. They are less pathogenic, because the alpha toxin is quickly recognized by the immune system, which subsequently rids the body of the pathogen. b. They are less pathogenic, because the beta toxin is more toxic and the clostridia produce only one or the other. c. They are more pathogenic, because the toxin enables the clostridia to lyse healthy human cells and grow/spread further. d. They are more pathogenic, because the toxin is a protective molecule that enablesthem to hide from immune cells.