Which of the following cells is a granulocyte?
A) eosinophil
B) lymphocyte
C) macrophage
D) monocyte
A) eosinophil
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Why is speciation by polyploidy more likely in plants than in animals?
A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis. B) Plant gametes lack postzygotic isolating mechanisms. C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction. D) Plants are sessile and cannot speciate via dispersal. E) Plants lack the DNA repair enzymes that animals have.
The components of membranes that account
for most of their active functions are a. carbohydrates. b. sterols. c. proteins. d. fats. e. phospholipids
The current status of gene therapy is:
a. it is currently being used effectively to cure cystic fibrosis. b. it has been terminated because clinical trials have shown that it is ineffective. c. it is being evaluated to assess the risks associated with potential side effects. d. the number of clinical trials is increasing at an almost uncontrolled rate. e. that it may be considered in the future, but currently the technology is not available.
Virus-infected cells produce ________, proteins that help neighboring cells fight further viral infections
A) lysozymes B) interferons C) histamines D) interleukin-2