Which of the following traits is NOT characteristic of Caulobacter?
A) abundant in aquatic habitats rich in nutrients
B) produces a cytoplasmic outgrowth (prostheca)
C) attaches to surfaces in nature
D) asymmetric cell division
Answer: A
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If 100 females produce 50 offspring, the age specific fertility rate is
A. 0.75. B. 0.5. C. 2. D. 50. E. impossible to calculate with this information.
Donor cells in conjugation are labeled ____ cells, whereas recipient cells are labeled ____ cells
a. F+; Fb. F+; F+ c. F-; F+ d. F1; F2 e. F+; F2
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.
The process by which some bacteria convert nitrate to atmospheric nitrogen gas is called ________
Fill in the blank(s) with correct word