DNA contains all of the following nitrogen-containing bases EXCEPT ____.

A. adenine
B. uracil
C. guanine
D. cytosine
E. thymine


Answer: B

Biology & Microbiology

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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

Biology & Microbiology

Mitotic cells do not divide regularly but can be stimulated to divide when necessary.

a. true b. false

Biology & Microbiology

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).

Biology & Microbiology

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.

Biology & Microbiology