An agar plate for counting colonies and maximizing statistical validity should ideally contain

A) 1 to 100 colonies.
B) 50 to 100 colonies.
C) 30 to 300 colonies.
D) 100 to 1000 colonies.


Answer: C

Biology & Microbiology

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If a biochemist discovers a new molecule, which of the following pieces of data would allow her to draw the conclusion that the molecule is a steroid hormone?

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Biology & Microbiology

Sterilizing filters have a pore size of 0.22 ?m. Which of the following statements is true?

A. Bacterial cells are typically between 1-10 ?m and pass through the filter, whereas most viruses are between 20 and 200 nm and are therefore blocked. B. Bacterial cells are typically between 1,000-10,000 nm and pass through the filter, whereas most viruses are between 20 and 200 nm and are therefore blocked. C. Bacterial cells are typically between 1-10 ?m and are blocked by the filter, whereas most viruses are between 20 and 200 nm and therefore pass through. D. Bacterial cells are typically between 1-10 nm and are blocked by the filter, whereas most viruses are between 20 and 200 ?m and therefore pass through.

Biology & Microbiology

The opening of which of the following is covered

with ciliated, fingerlike projections that produce a sweeping action? a. ovary b. uterus c. vagina d. oviduct e. follicle

Biology & Microbiology

Muscles are connected to bones by

A) cartilage. B) ligaments. C) tendons. D) myofibrils.

Biology & Microbiology