Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of _____

A) phosphorylated proteins
B) cAMP
C) adenylyl cyclase
D) activated G proteins


B

Biology & Microbiology

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Recall that angiosperms are, by far, the most diverse group of plants. Which plant group is the second most diverse, having approximately 23,000 living species?

A. the lycophytes B. the ferns and horsetails C. the bryophytes D. the gymnosperms

Biology & Microbiology

Match the item to its definition.

A) collection of dendrites B) collection of axons C) discontinuous insulation of the dendrite D) process that sends electrical signals toward from the cell E) excess of positive charge within the cell and excess of negative charge outside the cell F) discontinuous insulation of the axon G) region of nerve cells where the myelin sheath is incomplete H) gap between adjacent nerve cells I) excess of negative charge within the cell and excess of positive charge outside the cell body J) process that sends electrical signals away from the cell body 1) dendrite 2) nerve 3) myelin sheath 4) nodes of Ranvier 5) resting membrane potential 6) axons 7) synapse

Biology & Microbiology

Gene cloning

A. is the process of making multiple copies of a gene. B. is the process of isolating a particular gene of interest. C. is the process of determining the nucleotide sequence of a gene of interest. D. is the process of taking a gene of interest in one organism and putting it into another organism. E. is the process of making an organism that is genetically identical to its parent and its siblings.

Biology & Microbiology

The fatty-acid tails of a phospholipid are:

A) hydrophobic. B) hydrophilic. C) proteins. D) carbohydrates. E) polar.

Biology & Microbiology