Besides cell walls, features often found in plant cells but not in animal cells are:
A) water-filled central vacuoles.
B) cell membranes.
C) spindle-shaped centrioles.
D) mitochondria.
E) nuclei.
Answer: A
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As adults, insulin signaling through its receptor kinase enables virtually every cell in our body to transport glucose across the plasma membrane into the cytosol. Insulin also induces some cells to divide
Based on what you know about cell signaling, discuss the sequence of events from the time when insulin encounters the cell to the cell's reaction, and how the signal comes to an end. What will be an ideal response?
Which of the following substances is NOT normally
filtered from the blood? a. water b. plasma proteins c. urea d. glucose e. sodium
When Peter Agre and colleagues compared frog oocytes expressing aquaporin with control oocytes lacking aquaporin placed in pure water, they found that
A) the control oocytes lacking aquaporin swelled and burst as water was transported into the cells. B) the oocytes expressing aquaporin swelled and burst as water was transported into the cells. C) the oocytes expressing aquaporin collapsed as water was transported out of the cells. D) the oocytes expressing aquaporin first swelled and then collapsed as water was transported into and then back out of the cells. E) the oocytes expressing aquaporin first collapsed and then swelled as water was transported out and then back into the cells.
A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. The student did not have a clearly stated hypothesis before beginning the experiment. B. There was no control so the water could have come from other sources such as air in the jar or the soil. C. The experiment was not precise, meaning it was not reproducible. D. There was not a large enough sample of pea plants used to get adequate data.