Contamination with ________ is a concern because they are highly resistant to killing.
A. archaea
B. endospores
C. pleomorphs
D. vegetative cells
E. vibrios
Answer: B
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In the synthesis of amino acids the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.
Fill in the blank(s) with the appropriate word(s).
In streams and rivers, most of the microbial biomass is ________.
A. metabolically inactive B. floating on the surface C. buried in bottom sediments D. attached to surfaces
Pulmonary veins carry
a. oxygen-rich blood. b. oxygen-poor blood. c. blood back to the heart. d. blood from the heart. e. a combination of two of these
Baker's yeast or ________ are ethanol-fermenting yeasts commonly used when making bread and pizza dough
A) Lactobacillus delbrueckii B) Saccharomyces cerevisiae C) Thermus aquaticus D) Streptococcus thermophilus E) Aspergillus niger