What two sites are involved in the production and maturation of T lymphocytes?
A. tonsils and bone marrow
B. tonsils and thymus
C. thyroid and tonsils
D. bone marrow and thyroid
E. bone marrow and thymus
Answer: E
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A regulatory substance binds an enzyme outside of the active site and changes its shape so that it enhances the enzyme's activity. What does this illustrate?
a. allosteric regulation b. feedback inhibition c. redox reaction d. enhancing activation energy e. an active site, bound by substrate
Which of the following is false regarding the
properties of sound? a. The amplitude of a sound corresponds to loudness. b. The frequency of a sound is the number of wave cycles per second. c. Every ten-decibel increase in loudness represents a tenfold increase in intensity. d. A soft sound has a greater amplitude than a loud sound. e. A high note and a low note with the same amplitude are equally loud.
Ventilation by an individual exercising strenuously is
indicated by a. A. b. B. c. C. d. D. e. E.
An increased number of patients have recently been diagnosed with celiac disease, which you may know of as gluten sensitivity (OMIM 212750)
It is a multifactorial disorder of the small intestine influenced by genes and environment, and it is characterized by malabsorption due to inflammation of the mucosa after eating wheat gluten or related proteins. It is now thought to occur in 1 out of 120 to 300 people. Genes found to be associated with it are in the HLA region of chromosome 6, namely DR3 and DQw2. Which of the following is more probable? A) It is an autoimmune disorder. B) It is caused by exposure to gluten in infancy. C) It has high broad-sense heritability. D) Its frequency varies greatly by population. E) It is found primarily in inbred populations.