Which of the following statements is TRUE?
A) Endospores are for reproduction.
B) Endospores allow a cell to survive environmental changes by producing a dormant period with no growth.
C) Endospores are easily stained in a Gram stain.
D) A cell produces one endospore and keeps growing.
E) A cell can produce many endospores.
B
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How would you design an sRNA to bind to a sequence?
A) select six continuous nucleotides from the sequence B) take the complementary sequence of six continuous nucleotides C) select 200 continuous nucleotides from the sequence D) take the complementary sequence of 200 continuous nucleotides
The pathogenicity of primary tuberculosis is due to the fact that the mycobacteria
A. are not phagocytized. B. prevent fusion of lysosomes with vesicles. C. form a pseudomembrane. D. destroy helper T cells. E. are carried by macrophages to a variety of sites.
Chronic low-level ingestion of ________ may cause liver cancer.
A. aflatoxin B. aspergillin C. ergotamine D. phalloidin E. psilocybin
The evolution of prezygotic barriers to reproduction after postzygotic barriers already exist is called ____
a. species fusion b. reinforcement c. adaptive radiation d. geographic isolation e. hybridization