Endospores
A. are bacterial reproductive structures.
B. may be produced when nutrients are scarce.
C. are produced by bacteria, algae, and fungi.
D. are resistant to everything except radiation.
E. can last for only about 10 years.
Answer: B
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For some virulent phages, fragments of the host DNA may be included in the heads as the viral particles assemble,
providing the basis for ____.
a. transformation b. transmutation c. metabolism d. specific transduction e. generalized transduction
Infections agents can travel to their targets through:
a. the lymph b. muscles c. the bloodstream d. thickened mucus e. nerves f. cerebrospinal fluid
The velocity of water in a stream channel is greater along the margins of the channel than in the center of the channel
Indicate whether the statement is true or false
The first fish:a
were small and jawless but had bony armor. b. appeared about 2 billion years ago. c. were the lobe-finned fish. d. appeared in the Silurian period. e. developed in the Precambrian period.