lecture 31

glucose + fructose = sucrose

example of dehydration synthesis

Which of the following enzymes removes phosphate from proteins? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Phosphoreversase b Kinase c Dehydrogenase d Phosphatase

d

What is the typical target of intracellular receptors? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Proteins that become phosphorylated when the intracellular receptor is bound to the ligand b DNA sequences that increase transcription of certain genes c Phosphatases inside of the cell d Trimeric G- Proteins that exchange GDP for GTP

b

What type of protein in cAMP signal transduction would be analogous to the phosphatase of the phosphorylation cascade? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Protein kinase A b Phosphodiesterase c Phospholipase C d dephosphatase

b

The G-protein complex that binds to the G-protein coupled receptor has....... subunits. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 2 b 3 c 4 d 5

b 3

Epinephrine excites some tissues and inhibits others. What is the best explanation for these observations? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a The transduction pathways differ in the different tissues b It acts on intracellular receptor in some tissues and membrane receptors in others c There are different isoforms of epinephrine which cause different responses d The concentration of epinephrine in the blood determines the response by the tissue

a

An inhibitor of which of the following could be used to block the release of calcium from the endoplasmic reticulum Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Tyrosine kinase b Serine/threonine kinases c Adenyly lcylase d Phosphodiesterase e Phospholipase C

a and e

Small, non-protein molecules that are used to carry a signal inside the cell are called.... Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Transducers b Paracrines c Second messengers d Activators

c