Put the following events in the proper order:i
Pollen tube develops.
ii. Pollen grain lands on the stigma.
iii. Sperm fertilizes the egg.
a. i, ii, iii
b. i, iii, ii
c. ii, i, iii
d. iii, ii, i
C
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Some viruses possess icosahedral heads and helical tails
Indicate whether the statement is true or false.
Cytotoxic T cells destroy target cells by
A. the CD95 pathway. B. the perforin pathway. C. direct killing mediated by activated oxygen species. D. both direct killing mediated by activated oxygen species and the perforin pathway. E. both the perforin pathway and the CD95 pathway.
Which of the following statements is false?
a. HIV is the virus that causes AIDS. b. The AIDS virus is a retrovirus. c. The AIDS virus attacks macrophages, dendritic cells, and helper T cells. d. HIV has several target cells e. IgA antibodies can keep HIV levels low for decades.
Which of the following is a common incubation temperature for bacteria in a microbiology laboratory?
A) 0C B) 100F C) 98.7C D) 37F E) 37C