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
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.
Mitotic cells do not divide regularly but can be stimulated to divide when necessary.
a. true b. false