Early microscopes did not allow clear visualization of cells because they were limited by
A) magnification.
B) number of kernels.
C) resolution.
D) refraction.
E) both choices A and C
C) resolution.
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Size and shape may allow one to differentiate between a bacterium, fungus, or protozoan
Indicate whether this statement is true or false.
Exposing E. coli to calcium ions and DNA, then incubating the culture at low temperatures followed by heat shocking
induces ____.
a. artificial transformation b. a double crossover c. a single crossover d. DNA replication e. infection
The reason coral reefs are among the most productive and successful ecosystems is due to ________.
A. the coral-dinoflagellate mutualistic relationship B. commensalisms C. the lichen mutualistic relationship D. All of the choices are correct.
Which of the following statements about telomeres is INCORRECT?
A. Telomeres are crucial to the viability of a cell that replicates often. B. Telomeres would be longer in cells of older than younger individuals. C. Telomeres are short repeat sequences. D. Telomeres are lengthened by telomerase. E. Telomeres are found at the ends of chromosomes.