By reducing body temperature during hot weather, skin helps to maintain
A. blood pH.
B. body temperature homeostasis.
C. brain activity.
D. body structure.
E. blood volume.
B
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At very low concentrations, epinephrine causes an artery to dilate. At higher concentrations epinephrine causes the same artery to constrict. How can these different effects be explained?
A. There are two types of receptors for epinephrine that use the same second-messenger system. B. There are two types of epinephrine receptors with different affinities for epinephrine that use two different second-messenger systems. C. There is one type of epinephrine receptor that uses two second-messenger systems. D. At higher concentrations epinephrine can pass through the plasma membrane and directly stimulate contraction within the cell.
The two types of information needed to predict the inheritance pattern of a trait are
A. the way mitosis distributes the alleles of a gene and whether those alleles are dominant or recessive. B. the health of the mother and the father. C. the way genes are distributed in meiosis and the way that they come together when sperm joins egg. D. the age at which the trait appears and how it affects males or females.
An animal that is not producing urine has:
A) anuria B) dysuria C) stranguria D) oliguria E) nocturia
The process by which a less specialized cell matures into a more specialized cell is called ________.
A. differentiation B. maturation C. modification D. specialization