Of the following, which are the most closely related to crocodilians?
a) marsupials
b) snakes and lizards
c) eutherians
d) turtles
e) birds
Ans: e) birds
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Imagine that you are a medical student working in a cancer research laboratory. Your boss has given you samples of cancer cells and blood from a patient
She has told you that the cells have no mutations in any of their signaling molecule proteins (i.e., all the proteins are normal), but the cells' signaling transduction properties are not normal, causing them to be cancerous. Which of the following could account for the increased cell proliferation in the patient? A. The cells taken from the patient have more growth factor receptors than normal. B. The concentration of a signaling molecule in the patient is higher in the patient than usual. C. The cells taken from the patient exhibit a reduced level of signal amplification. D. Both A and B. E. A, B, and C.
Air enters human lungs from the mouth by passing through the ________.
A. posterior air sacs B. trachea C. spiracles D. esophagus E. nasal cavities
Animals tend to feed on prey that maximize their net energy intake. This is called the ________ theory.
A. maximal consumption B. optimization C. optimal foraging D. competitive exclusion
Which of the following cell types produce antibodies?
a) t- cells b) dendritic cells c) b- cells d) natural killer cells