Compared to the first big syphilis epidemic several hundred years ago in Europe, the strains of Treponema pallidum that cause syphilis today
A. tend to be more virulent.
B. tend to be less virulent.
C. are about equally virulent.
D. cannot be compared.
B.
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Cloning of plants from cuttings demonstrates that _____
A) an individual plant cell cannot de-differentiate and then redifferentiate B) differentiated plant cells may contain embryonic mRNAs C) plants lose genetic information in the differentiation process D) mature plant cells retain the full genetic information needed to carry out the developmental processes to produce a new individual plant
The portion of the sarcomere indicated by the red box in the photo shows which of the following?
A. overlapping actin and myosin filaments B. a portion of the myosin filaments without any overlapping actin filaments C. a portion of the actin filaments without any overlapping myosin filaments D. the Z disc E. titin filaments
The __________ is a system of fluid-filled sacs and canals in the inner ear. Fill in the blank(s) with the appropriate word(s)
Antipodals and synergids are
A. what will fuse to form the endosperm. B. nonfunctional vestigal structures. C. responsible for pollen tube formation. D. the result of double fertilization. E. produced in the female gametophyte.