Fossils from which would be the oldest from
the Grand Canyon?
a. hermit shale.
b. redwall limestone.
c. temple butte formation.
d. bright angel shale.
e. vishnu basement rocks
E
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Which test is the confirming test for people who initially tested antibody-positive in the screening ELISA test?
A. Quellung test B. Radioimmunoassay (RIA) C. Ouchterlony double diffusion D. Immunelectrophoresis E. Western blot
Traits controlled by sex-linked recessive genes are expressed more often in males because
A) males always carry two copies of these genes. B) males inherit these genes from their fathers more often than their mothers. C) males get more doses of the recessive gene than do females. D) the male has only one gene for the trait. E) all male offspring of a female carrier get the gene.
Correct and appropriate signal transduction processes are generally under strong selective pressure and are determined by the properties of the molecules involved, the concentrations of signal and receptor molecules, and the binding affinities
between signal and receptor. Therefore, a hormone action is very specific in a species at any one point in time. However, there are examples of very diverse functions of a specific hormone between groups of organisms. For example, thyroxin, which is produced in all vertebrates and many invertebrates, can trigger growth, differentiation, metamorphosis, maturation, reproduction, behavior, temperature tolerance, osmoregulation, or seasonal adaptation depending on the organism in which it is produced. What is the most logical explanation for such different responses triggered by thyroxin in organisms? A) The concentration of thyroxin varies in different organisms. Invertebrate organisms do not have as much thyroxin as vertebrate organisms. B) Thyroxin and its receptor molecules have a different binding affinity in different organisms. C) Receptor molecules for thyroxin are located on different tissues in different organisms. D) The structure of thyroxin is substantially different in different organisms.
Which of the following is a condition caused by a sex-linked inheritance in which a male child will bleed extensively because he lacks the physiological properties to form a blood clot?
A) male-pattern baldness B) hemophilia C) sickle-cell disease D) color blindness