Which of the following cells is also known as the "antigen presenting cell?"
Answer: macrophages
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Paraoxon is a toxic compound that disrupts the transmission of signals in the ____________________ system and can cause headaches, blurred vision, tremors, unconsciousness, and death by ____________________ arrest
Fill in the blank(s) with correct word
The oxygen released during photosynthesis directly comes from:
a. carbon dioxide b. glucose c. ribulose bisphosphate d. water e. atmospheric oxygen
Some athletes use "blood doping," in which additional red blood cells are added to the blood prior to the competition. What is the effect of blood doping?
A) It decreases blood pressure. B) It changes the blood type. C) It increases oxygen delivery to muscles. D) It makes blood thinner so that it flows faster.
Which of the following combinations of chromosomes would be typical of a human male?
A. two X-chromosomes B. an X-and a Y-chromosome C. 2 Y-chromosomes D. None of these is correct.