Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. presence of epinephrine receptors
B. exposure to epinephrine released by neighboring cells
C. activation of protein kinases
D. types of proteins expressed
E. rate of metabolism
Answer: D
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Which of the following is a possible use for gene cloning?
A. Cloned genes can be introduced into bacteria or livestock to make pharmaceutical products such as insulin. B. Cloned genes can be introduced into plants and animals to alter their traits. C. Cloned genes can be used to treat diseases. D. Large amounts of protein can be produced to study structure and function. E. All of the choices are correct.
Achondroplasia, a hereditary form of dwarfism, is an autosomal dominant disorder; however homozygous dominant
individuals either die before birth or very shortly thereafter. The homozygous recessive condition is normal. A dwarf couple decide to have children. Use this information to answer the following question:Of the children of this couple who survive, what is the probability that they will be normal?
a. 0 b. ¼ c. 1/3 d. 2/3 e. ½
A population’s vital statistics are known as its ____
a. age structure b. population density c. total fertility rate d. demographics e. population diversity
The intricate structure of a DNA molecule involves two strands of DNA running parallel to one another in the same direction
A) True B) False