Which conclusion do these data support?
1.Wild type mice are slower swimmers.
2.Both wild type mice and mice with the R451C mutation are able to learn.
3.Wild type mice are quicker learners.
4.Genetic modification improves swimming ability in mice.
2
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What category of proteins facilitates the movement of ions and molecules across membranes?
A. regulatory proteins B. protective proteins C. transport proteins D. cell-signaling proteins E. motor proteins
Oxygen has an atomic mass of 16 and an atomic number of 8. How many neutrons are present?
A. 24 B. 4 C. 8 D. 16
Which of the following contributes to gas exchange in the human fetus?
A) the lower blood pH of the embryo B) the lack of turbulence in fetal blood C) the high oxygen levels maintained in the amniotic fluid by the placenta D) the stronger attraction, when compared to adult hemoglobin, that fetal hemoglobin has for oxygen
The top priority for energy allocation in animals is ____
a. maintenance metabolism b. growth c. reproduction d. storage
e. growth of sexually dimorphic features