Question: Membrane proteins can have a variety of functions. What functions can these proteins have? Check all that apply.

Answer: channel

recognition

reception

transport

Question:

Answer: an increase in cell proliferation at the meristem because autophosphorylation cannot occur

an increase in WUS expression

Question: Glucose is taken up by red blood cells by binding to a specific pocket in a membrane protein that then allows it to cross the membrane and move down its concentration gradient. What would be the best explanation of this process?

Answer: facilitated diffusion using a transporter

Question: Actinomycin D is a transcriptional inhibitor. If added to cells in culture, which classes of signaling pathways would likely be directly affected by this inhibitor? Select all that apply.

Answer: The insulin signaling pathway

The estrogen signaling pathway

Question: How can epinephrine have different effects on different cells?

Answer: Different cells have different receptors that bind epinephrine.

Different cells activate different enzymes as a result of epinephrine binding.

cAMP activates different kinases in different cells.

Question: Transdermal drug patches, such as nicotine patches, are applied to the skin. The drug is applied in a relatively high dosage to the inside of the patch, which is worn on the skin for periods of time. The drugs enter the bloodstream directly through the skin. Theoretically, how do the patches work?

Answer: The drug will move into the blood, through diffusion, for a long period of time, maintaining a constant concentration of drug in the blood.

Question: Facilitated diffusion is used to transport

Answer: sugars and amino acids.

Question: The hormone insulin is a protein produced in the pancreas and then secreted into the blood stream after a meal to increase glucose uptake by tissues. What cellular process is used to secrete insulin from the pancreas?

Answer: exocytosis

Question:

Answer:

Question: How can phosphorylation affect protein function? Select all choices that apply.

Answer: It can activate some enzymes.

It can inhibit some enzymes.

It can provide a site or location on some proteins for other proteins to bind.