A/an _______ is one that is present in the common ancestor and all members of a group.
A. ancestral character
B. clade
C. character trait
D. derived character
E. analogous structure
Ans: A. ancestral character
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In the average human, the heart beats ____ times per minute
a. 10 b. 53 c. 72 d. 95 e. 120
The __________ is a sedimentary cycle; Earth's crust is the largest reservoir, and there is no major
gaseous form. Fill in the blank(s) with the appropriate word(s).
In order to be completely functional, a T cell must be activated by
A) bone marrow. B) the thyroid gland. C) the parathyroid gland. D) the thymus gland. E) the lymph nodes.
A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is the likeliest diagnosis for this child?
A) Bruton-type agammaglobulinemia B) Grave's disease C) severe combined immune deficiency (SCID) D) systemic lupus erythematosus (SLE) E) hemolytic disease of the newborn