Which of the following does not account for the small size of cells?

A) the distance from the cell interior to the cel surface
B) the surface area/volume ratio
C) the length/surface area ratio
D) the number of mRNAs that can be produced by the nucleus
E) the rate of diffusion


Answer: C) the length/surface area ratio

Biology & Microbiology

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A vector is a small segment of DNA that a gene of interest is inserted into for cloning

Indicate whether the statement is true or false

Biology & Microbiology

Rising air temperatures at the leaf surface can increase evaporation, although evaporation can also cool a leaf

somewhat.

a. True b. False

Biology & Microbiology

Food infections have incubation periods of days to weeks, whereas the incubation period for food intoxications is hours to days. Please select the true statements that explain this situation.

> In food infections, the microorganism has to grow in the infected human host, producing more toxins as it reproduces. > The elements that cause food intoxications, like arsenic and mercury, are extremely potent in tiny amounts causing a faster disease symptomology. > The gram-positive bacteria, the organisms causing food intoxications, grow much faster than gram-negative bacteria, the organisms causing food infections. > Food intoxications involve the ingestion of exotoxins produced by microorganisms in the food whereas food infections involve the ingestion of the microbial cells themselves.

Biology & Microbiology

The figures above represent three hypothetical populations; each circle is an organism. Write the letter of the pattern that you would expect to find. Individuals are distributed randomly within the environment

A. A B. B C. C

Biology & Microbiology