The cell most likely responsible for an immediate release of chemical mediators right at the site of injury is the:
A. Mast Cell
B. Platelet
C. Eosinophil
D. Endothelial
Ans: A. Mast Cell
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In biology lab, your instructor informs you that carbon-14 dating will demonstrate the use of determining the age of a fossil. Using only this information, you estimate that the age of the fossil must be less than about years old.
A. 75,000 B. 1.3 billion C. 40,000 D. 100,000 E. 300,000
According to the principle of segregation, a heterozygous plant with alleles Aa will produce:
A. gametes with only the A allele. B. gametes with only the a allele. C. 50% of gametes with the A allele and 50% of gametes with the a allele, on average. D. gametes in the ratio of 3 A alleles:1 a allele. E. some gametes with the A allele and some with the a allele, but in no predictable ratio.
What is considered a normal blood pressure?
a. 100 / 60 b. 65 / 100 c. 80 / 120 d. 120 / 80 e. 140 / 120