Which of the following is the most common cause of tooth decay?
A) Staphylococcus aureus
B) Streptococcus agalactiae
C) Streptococcus mutans
D) Streptococcus pyogenes
C) Streptococcus mutans
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Which of the following can be used to estimate the number of microorganisms in a culture?
A. Measurements of microbial biomass B. Direct counts of microbial cells C. Counts of viable cells using colony growth procedures D. All of the choices are correct.
Helping other individuals at a reproductive cost to oneself might be adaptive if those helped are _____
Fill in the blank(s) with correct word
The stomach begins chemical digestion of which of these substances?
A) fats B) proteins C) sugars D) carbohydrates
Sulfolobus grows in aquatic environments at temperatures up to ________ and a pH of ________
a. 80°C / 1–5 b. 90°C / 1–5 c. 70°C / 7–10 d. 100°C / 3–6