An organ system is a group of organs that
a) work together to perform a specific function
b) work together to perform all the functions in a multicellular organism
c) are made up of similar cells
d) are made up of similar tissues
Ans: a) work together to perform a specific function
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A public health microbiologist plans to screen a particular bacterial species that was isolated from several patients in an intensive care unit to detect if any of the cells are penicillin-resistant mutants. What is the first step in conducting this experiment?
A. Set up an Ames test to see if any of the isolates are mutagenic. B. Determine whether or not wild type cells of the same bacterial species are susceptible to penicillin. C. Test the cells to see if they can grow on media to which penicillin has been added. D. Perform an antibiotic susceptibility test on the cells using antibiotics other than penicillin that are known to be effective.
Which of the following applications, used by farmers to control weeds, relies upon turning the soil over?
A) tilling B) mulching C) spraying herbicides D) irrigation
A fertilized egg is a
A) sporophyte. B) gametophyte. C) zygote. D) spore. E) gamete.
In the Sonoran desert, a species of cactus pollinated by hawkmoths closes its flowers at dawn (and reopens them at dusk). Propose a possible proximate and ultimate explanation for this.
What will be an ideal response?