Which chromosomes are carried by a normal
female butterfly?
. ZO
b. ZW
c. WW
d. WO
e. ZWW
B
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
Animal models such as the ____________________ and ____________________ are being studied to identify single
genes that control aspects of learning, memory, and spatial perceptionFill in the blank(s) with the appropriate word(s).
Some of the bacteria found in the human digestive system help us to break down and digest food. In return, the bacteria obtain food and nutrients. This type of relationship is known as...
a) parasitism b) commensalism c) coexistence d) mutualism
You modify the gene for an integral membrane protein so that the cytoplasmic portions of the protein are deleted. When the gene is inserted in cells, what happens to the mobility of this protein in the membrane?
a) they often do not move at all b) they often move much greater distances than the intact protein c) they often move much smaller distances than the intact protein d) they often flip to the opposite leaflet