A system that consists of a group of 20 proteins whose activities enhance the body's other defense mechanisms is called ________
A) antigen
B) antibodies
C) mast cell
D) complement
D
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If a new human metabolic disease is found that only allows electrons to be used from NADH and not
FADH2, what is a probable explanation for the cause of the disease?
a. a defect in assembly protein genes for complex II of the electron transfer system b. enzyme defects in glycolysis and the citric acid cycle c. a deficient amount of cytochrome c and coenzyme Q d. improper regulation of phosphofructokinase e. inability of oxygen to act as a final electron acceptor
The biosphere is defined as the portion of _____ where life exists.
A. the earth B. the atmosphere C. the ocean D. land on Earth E. fresh and salt water
Organisms "X" and "Y" are suspected to be the same species. Which of the following will provide the
ultimate proof? a. interbreeding b. anatomy c. physiology d. ecology e. behavior
When does the human embryo implant in the wall of the uterus?
A) within a few hours of fertilization B) about a day after conception C) about a week after conception D) just after gastrulation