All of the following nucleotide bases are pyrimidines except
A. adenine.
B. thymine.
C. cytosine.
D. uracil.
E. cytosine and thymine.
A. adenine.
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Some bacteria have a cytoskeleton of sterols to help maintain their shape.
Answer the following statement true (T) or false (F)
Interferons____
a. make holes through bacterial cell membranes b. make holes through bacterial cell walls c. prevent entry of viruses into cells d. block the replication of viruses within cells e. bind iron and make it unavailable for bacteria and viruses
Birds living in a cold environment tend to have
a. long legs and larger bodies. b. long legs and smaller bodies. c. short legs and larger bodies. d. short legs and smaller bodies. e. the leg length and body size of birds does not relate to the environment.
Proteins function in modern cells as
A. structural elements. B. hereditary information. C. catalysts. D. both catalysts and structural elements.