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
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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
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
Rising air temperatures at the leaf surface can increase evaporation, although evaporation can also cool a leaf
somewhat.
a. True b. False
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.