Which mineral is essential to the production of thyroid hormone?
a. iron
b. calcium
c. sodium
d. potassium
e. iodine
E
You might also like to view...
In prokaryotes, the genes for metabolic pathways are ____
a. always expressed for early steps in the pathway, but generally not expressed for later steps in the pathway b. always expressed so the bacteria can respond to rapidly to changing conditions c. turned on and off as conditions change d. always independently regulated e. generally expressed at low levels, but expressed at high levels when conditions warrant
Herpesvirus 8 encodes a protein that acts as a(n) ____
a. tumor suppressor b. transcription factor c. cyclin d. polymerase e. enzyme
At low population density, __________ is favored, quickly producing as many offspring as possible. Fill in the blank(s) with the appropriate word(s)
Before Darwin, scientists such as Lamarck envisioned evolutionary change as transformational—properties of an ensemble change because every member of the ensemble changes
Darwin's theory of evolutionary change was by contrast a variational one—the properties of an ensemble change because of the action of some sorting process acting on preexisting variation within the ensemble. Re-ferring to the figure above, describe the kind of sorting process that takes place when we use artificial selec-tion to change the characteristics of a breed of animals or plants and when natural selection operates on a population. What will be an ideal response?