What type of leucocytes first appear at site of microbial invasion?
A. Macrophages
B. Neutrophils
C. B lymphocytes
D. Eosinophils
E. T lymphocytes
Ans: B. Neutrophils
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Cellulose is a polymer of ________, a common monosaccharide.
Fill in the blank(s) with the appropriate word(s).
What are the two most important variables for cells to survive?
a. Temperature and pH b. Temperature and solute concentration c. Solute concentration and nutrient levels d. Solute concentration and pH e. Temperature and nutrient levels
Compare the characteristics of mammals and birds, noting the similarities and differences between the groups. Why don't we consider mammals and birds closely related with a common ancestor, since they are both "warm-blooded"?
What will be an ideal response?
Choose the best cause and effect sequence for the process of speciation by natural selection.
A. Variation --> Reproductive Isolation --> Speciation --> Mutation --> Selection B. Variation --> Selection --> Reproductive Isolation --> Mutation --> Speciation C. Selection --> Speciation --> Reproductive Isolation --> Variation --> Mutation D. Speciation --> Reproductive Isolation --> Selection --> Mutation --> Variation E. Mutation --> Variation --> Selection --> Reproductive Isolation --> Speciation