DNA contains all of the following nitrogen-containing bases EXCEPT ____.
A. adenine
B. uracil
C. guanine
D. cytosine
E. thymine
Answer: B
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Identical twins have identical ____, but they do not always have identical ____
a. mitochondrial DNA; genotypes b. genotypes; mitochondrial DNA c. genotypes; phenotypes d. phenotypes; genotypes e. phenotypes; mitochondrial DNA
Mitotic cells do not divide regularly but can be stimulated to divide when necessary.
a. true b. false
The ________ is a complex structure or set of structures lying beneath the plasma membrane of many protozoa and some algae, which serves as a supportive mechanism for these cells.
Fill in the blank(s) with the appropriate word(s).
The type of receptor that consists only of a naked nerve fiber ending is called a
A. Pacinian corpuscle. B. Meissner's corpuscle. C. nociceptor. D. cochlear hair cell. E. cone.