- Some drugs are made of fairly large polar molecules which cannot easily enter cells. To correct this problem,
drugs are now being delivered into cells by containing them inside liposomes, in which the drug is surrounded
by a phospholipid bilayer. Given what you have learned about phospholipids, cell membranes and polar vs
nonpolar molecules, explain how the drug packaged in liposome enters the cell. (Note: I’m not looking for an
answer you looked up. I’m more concerned with your logic.)
- Mackerel are cold-water fish that thrive at 12 °C but can survive at 4 °C. Assuming membrane fluidity
remains the same, how will the composition of a mackerel’s cell plasma membranes change in terms of length
of fatty acids in the membrane, the degree of unsaturation of fatty acids, and overall cholesterol concentration
when the water’s temperature drops from 12 °C to 4 °C
- For the following biological phenomena, identify the signal and the response. There is no need to do
research on each topic, I am looking for you to read the phenomena and answer using the information given.
Example: Follicle-stimulating hormone stimulates a cell to secrete growth factors.
Signal: Follicle-stimulating hormone
Response: growth factor secretion
Insulin levels in the blood lead to glucose being imported into fat cells.
A growth factor stimulates the synthesis of proteins needed for a cell to grow
An undifferentiated cell becomes a glial cell after coming in contact with a neuron expressing the Delta protein.
- Your book divides cell signaling into 4 stages: Receptor activation, signal transduction, response, and
termination (see Figure 9.3).
Place each of the following events into the correct stage of cell signaling
a. A G protein catalyzes the hydrolysis of GTP to GDP and Pi
b. Receptor kinase dimerizes after binding insulin
c. Inactivation of a receptor kinase by a protein phosphatase
d. Changes in gene expression
e. Adrenaline binds the extracellular domain of a G protein-coupled receptor
f. Activation of protein kinase A (PKA)
in order to get her to marry him, which later causes rumors to be spread. As Don Pedro states in Act 1, “I will assume thy part in some disguise and tell fair Hero I am Claudio, and in her bosom I’ll unclasp my heart”, which expresses how Don Pedro was genuinely lending a hand, the concept of masks is executed by Shakespeare as a symbol to hide the reality and deceive their identity. Through an act of deceit made by Don John, Claudio assumed that Don Pedro wanted Hero for himself. Claudio felt miserable, as he believed Don John, even though it was already planned for him to marry Hero. He demonstrates his emotions towards the situation by “wishing him joy of her” giving up hope, which serves as a tone of defeat because he wasn’t gonna get what he wanted, and believed that his friend betrayed him. Although the outcome turned out as planned, he still decided to believe Don John over his friend. After the failure that occurred during the ball, Don John out of despite used malevolent actions to try and ruin Claudio and Hero’s conjoinment. Don John makes Claudio believe that Hero is having an affair with another man, which leads him to shame her on their wedding day. In act 4 scene 1 friar asks if either of them know of any impediment, to say them now, Claudio responds “What man was he talked with you yesternight, out at your window betwixt twelve and one?,” hero responds, “I talked with no man at that hour, my lord”. Through the use of irony Shakespeare conveys that Hero tells nothing but the truth, however acquaintances including Claudio choose to doubt her and believe the men w>GET ANSWER