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

Biology & Microbiology

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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.

Biology & Microbiology

Helping other individuals at a reproductive cost to oneself might be adaptive if those helped are _____

Fill in the blank(s) with correct word

Biology & Microbiology

The stomach begins chemical digestion of which of these substances?

A) fats B) proteins C) sugars D) carbohydrates

Biology & Microbiology

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

Biology & Microbiology