Which of the following is a purine base found in nucleotides?
a. uricil
b. steroid
c. guanine
d. cytosine
e. thymine
c
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The most likely explanation for the phenomenon where a protein may be found in different sub-cellular locations in different cells is
A. stabilization of the mRNA transcript B. alternative splicing C. RNA interference D. transport of mRNA from the nucleus to the cytoplasm
Which molecule is directly responsible for breaking down cAMP to inactive AMP?
A. protein kinase A B. adenylyl cyclase C. phosphodiesterase D. GTPase E. protein phosphatase
The fluid mosaic model of cell membrane structure describes a membrane with phospholipids that ________ and proteins that ________
a. can drift laterally / may either be fixed or capable of drifting b. are permeable to water-soluble molecules / spontaneously assemble into two layers c. are fixed in place / can drift laterally d. can drift laterally / are fixed in place
In the cell cytoplasm, molecules of ATP are a ________.
A. solute B. solvent