The interactions and exchange of energy between all feeding levels is known as a ________
A) food web
B) feeding frenzy
C) trophic level
D) food succession
A
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Activation of which of the following is associated with the formation of focal adhesions and stress fibers?
A) Rho B) Ras C) Cdk-42 D) intermediate filaments E) ?-tubulin
The genetic code is essentially the same for all organisms. Based on this information, one can logically assume which of the following statements to be correct?
a. A gene from an organism can theoretically be expressed by any other organism. b. All organisms have experienced convergent evolution. c. The same codons in different organisms translate into the different amino acids. d. DNA was the first genetic material. e. Different organisms have different numbers of different types of amino acids.
Antibiotic resistance genes are often included on plasmid vectors because
A) antibiotic resistance is used to select for bacteria cells containing the vector. B) antibiotic resistance can be used to control the growth of the genetically modified organism. C) antibiotics are often present in humans being treated for disease. D) only bacteria are affected by antibiotics. E) antibiotic resistance genes can be used as transcriptional reporters.
Robert Koch helped establish the germ theory of disease by discovering that anthrax was caused by a disease. After he isolated and purified the same bacteria from several diseased animals, what would be the next step in order to show that this bacteria
caused anthrax? A) culture the bacteria on Petri dishes B) perform physiological testing C) visualize the bacteria with an electron microscope D) find out if antibiotics treat the diseased animals E) introduce the bacteria into a new mouse to see if it established the same infection