With a transmission electron microscope, objects are generally magnified
a) 1,000 to 100,000x.
b) 1,000 to 10,000x.
c) 10,000 to 10,000,000x.
d) 10,000 to 100,000x.
Ans: c) 10,000 to 10,000,000x.
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Proteins on the cell surface label the cells as "self", identifying them to the immune cells as belonging to the organism
Indicate whether the statement is true or false.
Long-term sequelae of Group A streptococcal infections include all the following, except:
A. risk decreased with prompt treatment of skin infections and pharyngitis. B. development of rheumatic fever. C. appearance of sequelae within a few weeks after an initial infection. D. transmission of sequelae via respiratory secretions from a patient with streptococcal sore throat. E. development of acute glomerulonephritis.
Which statement about seedless vascular plants is true?
a. Seedless vascular plants tend to thrive in moist environments. b. Liverworts and horsetails are seedless vascular plants. c. Ferns are the earliest group of seedless vascular plants. d. Seedless vascular plants absorb nutrients through exposed surfaces.
Four of the five animals listed below are migratory. Select the exception
a. monarch butterflies b. indigo buntings c. white-crowned sparrows d. gray whales e. wood lice