Which of the following is a purine base found in nucleotides?

a. uricil
b. steroid
c. guanine
d. cytosine
e. thymine


c

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

In the cell cytoplasm, molecules of ATP are a ________.

A. solute B. solvent

Biology & Microbiology