Approximately what percentage of women with a harmful BCRA mutation will develop breast cancer?
A. 60%
B. 48%
C. 15%
D. 12%
E. 1.4%
A
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What accounts for the lysis of a bacterial cell in the presence of a membrane attack complex?
A. loss of cytoplasm due to the presence of large channels in the membrane B. unregulated signaling due to the addition of novel proteins to the cell's membrane C. increased osmosis leading to swelling and rupture of the cell D. apoptosis due to the loss of DNA
During the nineteenth century, sea otters were hunted almost to the point of extinction. When the number of sea otters became very low, it was noticed that the ecosystem of kelp bed "forests" was also disappearing
It was discovered that the sea otters were predators of sea urchins, which were, in turn, predators of the kelp. When sea otters declined, the sea urchin populations grew, destroying the kelp ecosystem and the many species that depended on it. What role did sea otters perform in this ecosystem? A) competitors B) producers C) a keystone species D) parasites
Temperature tends to decline with longitude.
Answer the following statement true (T) or false (F)
The starch production center within many algal cells is the
(a) nucleus. (b) cytoplasm. (c) stipe. (d) pyrenoid.