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Biol 150 exam questions and answers verified 2024
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Biol 150 exam questions and answers verified 2024
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Biol 150 exam #2 QUESTION ANDANSWERS 100% CORRECT (5 PGS)
if a cAMP molecule is not being produced, what step of signaling would most
likely be directly affected? - correct answer ✔Transduction
The signaling type that requires actual contact with another cell is the - correct
answer ✔Juxtacrine
If you had to design a serum that increases the cell division of fibroblast cells
you are trying to grow in the lab, what would you use? - correct answer
✔Blood not allowed to clot
how can you have a cell be both a paracrine signaler and an autocrine
signaler? - correct answer ✔It has the specific receptor for the ligand it is
releasing
Which of the following statements is TRUE in regards to G-coupled protein
receptors? - correct answer ✔Upon ligand binding the GCPR will activate a
G protein which will exchange GDP to GTP
A new poison prevents signal transduction by preventing the dimerization of
receptors What is the most likely receptor type affected? - correct answer
✔Receptor kinase
What properties do receptor kinases have? - correct answer ✔A, B, and C.
They tend to be long lasting signals, the receptor proteins ofter dimerize, they
can often lead to the phosphorylation of multiple secondary proteins
, What is true of cell signal amplification? - correct answer ✔A, B, and C. It
happens intracellularly, it often uses secondary messengers, a single ligand
can cause the activation of many proteins.
Cyclin-dependent kinases are always present in the cell but are active only
with the appropriate cyclin bond - correct answer ✔true
receptor kinases like other transmembrane receptors typically result in short
term responses - correct answer ✔false
bacteria often communicate vis quorum sensing, an autocrine signal - correct
answer ✔true
A mutation of the Ras (rat sarcoma) gene causes the Ras molecule to be
constantly on, often leading to cancer. - correct answer ✔True
In G-Protein-Coupled receptors, the ligand binds directly to the G-protein
complex - correct answer ✔False
Cyclic AMP (cAMP) is converted from GTP by adenylyl cyclase - correct
answer ✔False
A kinase enzyme helps add a phosphate group to a sugar molecule, if the
Gibbs free energy of adding a phosphate to glucose is 20, what will the free
energy of the reaction likely be in the presence of the kinase? - correct
answer ✔20
An organism that gains its energy from the sun but requires organic carbon is
called a - correct answer ✔photoheterotroph
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